Thermo Scientific Odalog G20 Series User manual

Odalog G20 Series
User Manual
ODA59-0691 February 2023

Contents
Safety Precautions 5
FCC 5
EMC 5
Alert Signals 5
Your Odalog G20 8
The Models 8
Unpacking 9
Introduction 10
Odalog G20 10
Odalog G20 RTx 10
General Specifications 11
Quick Start Guide 13
First Deployment 13
OdaStat-NX installation 13
Switching ON 13
USB Connection 13
Bluetooth Connection 13
Configuration 13
Enabling the Modem (G20 RTx) 14
Care of the Odalog G20 14
Operation 15
Odalog Display 15
LCD Layout 15
Switching ON 16
Odalog G20 16
Main Menu 16
Extra Menu 18
Odalog G20 RTx 18
Main Menu 18
Communications 21
MODBUS 21
Modem (G20 RTx) 22
OdaStat NX 25
Home Screen 25
Serial Connection 25
Bluetooth Connection 26
The Main Menu 27
Unit Care 32
Deployment 32
Calibration 32
Troubleshooting 34

FCC
This device complies with Part 15 of the FCC Rules and with
Innovation, Science and Economic Development Canada’s
licence-exempt RSS(s). Operation is subject to the following
two conditions:
1. This device may not cause interference; and
2. This device must accept any interference, including
interference that may cause undesired operation of
the device.
L’émetteur/récepteur exempt de licence contenu dans le
présent appareil est conforme aux CNR d’Innovation, Sciences
et Développement économique Canada applicables aux
appareils radio exempts de licence. L’exploitation est autorisée
aux deux conditions suivantes:
1. L’appareil ne doit pas produire de brouillage;
2. L’appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d’en compromettre
le fonctionnement.
WARNING: Any changes or modifications not
expressively approved by the grantee could void
the user’s authority to operate this equipment.
This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when
the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference
to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his
own expense.
EMC
ICES-003 statement: Class A CAN ICES-003 (A) /NMB-003 (A)
This equipment complies with the FCC and ISED
Canada radiation exposure limits set forth for an
uncontrolled environment. This equipment should be installed
and operated with a minimum distance of 20 cm between the
radiator and all persons during normal operation.
Safety Precautions
Alert Signals
Odalog®G20
As the user of the product, it is your responsibility to
understand the proper function and operational
characteristics of the loggers. This user manual should be
thoroughly read, and all operators should be given
adequate training before attempting to place the loggers
in service. Awareness of the stated cautions and warnings and
compliance with recommended operating parameters, together
with maintenance requirements, is important for safe and
satisfactory operation. The unit should be used for its intended
application; alterations or modifications will void the warranty.
Do not use solvents to clean the Odalog gas logger
(a damp cloth will suffice).
Do not insert objects (including fingers) into the gas
inlet, as the filter may be damaged.
Do not attempt to disassemble sensors as they are
potentially corrosive.
Before each day’s use, sensitivity must be tested
on a known concentration of test gas (to match
the sensor type) equivalent to 20-50 percent of
full-scale concentration. Accuracy must be within
5% of full scale. Accuracy may be corrected
by calibration as described in the
“Calibration” section.
The Odalog gas logger is not designed to operate
as a safety device. When entering confined spaces
and toxic hazard environments, all appropriate
regulations and occupational health and safety
precautions should be strictly adhered to. If unsure
of potential hazards or safety standards, seek
advice from your workplace occupational health and
safety department or government regulatory body.
The ambient temperature range that the apparatus
is suitable for is -20 °C to +50 °C.
“EX” CERTIFICATION is valid only to
21% VOL oxygen. The Odalog gas logger should
not be used in oxygen-enriched atmospheres.
The battery shall not be removed or
replaced by the user for any maintenance.
Contact manufacturer/authorized distributor.
Odalog Portable Gas Loggers
Safety Precautions | 5

Only touch the instrument with an insulating object.
To avoid build-up of electrostatic charge, the
instrument shall be installed in a fixed location
where it will be protected from inadvertent rubbing
or strong flow of air and dust. It shall only be
cleaned or wiped with a damp cloth.
Only use the micro-SD card that is provided or
recommended by the manufacturer.
The enclosure shall only be disassembled in the
non-hazardous area.
The JTAG is not meant for use by the user.
The USB parameters have been limited to 3.3 V.
This shall be derived from a SELV or PELV system.
The following parameters shall be taken into
account during interconnection in a system.
Odalog G20 Entity Parameters at Connector CN6:
Uo 3.9 V
Io 275 mA
Lo 55.77 μH
Co 22 μF
Ui 3.7 V
Pi 206 mW Ci 181μF Li 20.2 μH
The maximum external capacitance and maximum
external inductance of the circuits connected at
CN6 have been additionally assessed for spark
ignition compliance with resistive current limiting
circuits at elevated voltages and currents and found
to be compliant as follows:
U 7.6 V
I 480 mA
Co 203 μF
Lo 75.9 μH
Odalog®G20 RTx
This instrument transmits radio frequencies
(2G/3G/Wi-Fi*), ensure all safety precautions are
observed (depending on model). A separation
distance of at least 20 cm must be maintained
between the modem transmitter’s antenna and the
body of the user or nearby persons.
Disable communications when instrument is being
transported via airplane.
LITHIUM BATTERY SAFETY:
a. This instrument uses lithium battery. All safety
and handling precautions must be observed
(lithium contained = approx. 3.9 grams per D-size
high current battery). If dangerous good transport
apply in your locality, remove the battery for
transport if dangerous. (goods suitable for shipping
methods are not available)
b. Avoid moisture contact with lithium batteries,
may cause damage/explosion.
c. Do not attempt to disassemble
instrument that shows signs of battery damage
inside instrument.
d. Observe battery manufacturer’s guidance
on disposal.
e. Battery handling/shipping, safety and
disposal information is available from manufacture
or contact distributor for information.
This instrument is not ‘intrinsically safe’ and should
not be used in potentially flammable or oxygen
enriched atmospheres.
Do not use solvents to clean the instrument.
(a damp cloth will suffice).
The apparatus is suitable for ambient temperature
range of -20° C to +50° C.
Install and secure wiring (and excess wiring)
attached to this instrument in accordance with
workplace health and safety regulations of the
installation site.
It is recommended that the instrument be installed
out of direct sunlight (sheltered).
Service and/or repair work on this instrument
must only be carried out by authorized
service technicians. Return the instrument to an
authorized service agent/distributor for any internal
maintenance (other than changing the SD card and
SIM card).
If using a custom external antenna, ensure
manufactures safety precautions are adhered to.
Long-term exposure to temperature or humidity
levels outside the instrument range may result in
damage to the sensor and inaccurate data.
The Odalog gas logger is not designed to operate
as a safety device, and should not be used for
confined space entry or hazardous area monitoring.
Do not insert objects (including finger) into gas inlet
as the filter may be damaged.
Do not attempt to disassemble sensors as they are
potentially corrosive.
Before each deployment, sensitivity must be tested
on a known concentration of test gas (to match
the sensor type) equivalent to 20-50 percent of
full-scale concentration. Accuracy must be within
±10% of actual concentration or ±5% of full scale.
Accuracy may be corrected by calibration (refer to
user manual for calibration). It is recommended that
a gas check be performed after deployment as well,
so that accuracy of logged data can be checked
(and corrected if necessary in the software).
The battery shall not be removed or replaced by
user for any maintenance. Contact manufacturer
authorized distributor.
Only touch the instrument with an insulating object.
To avoid build-up of electrostatic charge, the
instrument shall be installed in a fixed location
where it will be protected from inadvertent rubbing
or strong flow of air and dust. It shall only be
cleaned or wiped with a damp cloth.
Only use the micro-SD card that is provided or
recommended by the manufacturer.
The enclosure shall only be disassembled in the
non-hazardous area.
The following parameters shall be taken into
account during interconnection in a system.
Odalog G20 RTx Entity Parameters at
Connector CN6:
Uo 3.9 V
Io 275 mA
Lo 55.77 μH
Co 22 μF
Ui 3.7 V
Pi 206 mW
Ci 181 μF
Li 17 μH
The maximum external capacitance and maximum
external inductance of the circuits connected at CN6
have been additionally assessed for spark ignition
compliance with resistive current limiting circuits at
elevated voltages and currents and found to be
compliant as follows:
U 7.6 V
I 518 mA
Co 203 μF
Lo 73 μH
6 | Safety Precautions
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Safety Precautions | 7

The Models
The following Table 1 shows the available units covered in this user manual. The G20/ G20 RTx Gas Loggers are portable gas
monitoring devices capable of logging poisonous gases in the harshest environments.
Table 1. G20 Applicable Model
Model Range (ppm) Part Number Resolution (ppm) Communication
G20 200 Odalog-G20-H2S-200 0.1 USB, Bluetooth,
MODBUS
G20 2000 Odalog-G20-H2S-2000 1USB, Bluetooth,
MODBUS
G20 RTx 200 Odalog-G20-RTx H2S-
200 0.1 USB, Bluetooth,
MODBUS, 4G
G20 RTx 2000 Odalog-G20 RTx-
H₂S-2000 1USB, Bluetooth,
MODBUS, 4G
Unit’s Label
Figure 1 and Figure 2 shows the labels for the Odalog G20 and Odalog G20 RTx; each model has different
compliance information.
Your Odalog G20
Figure 2. G20 RTx LabelFigure 1. G20 Label
Unpacking
At delivery, examine the exterior for physical damage while
the carrier’s representative is present. If exterior damage
is present, carefully unpack and inspect the unit and all
accessories for damage. If there is no exterior damage, unpack
and inspect the equipment within five days of delivery.
If you find any damage, keep the packing materials and
immediately report the damage to the carrier. Please do not
return goods to the manufacturer without written authorization.
When submitting a claim for shipping damage, request that the
carrier inspect the shipping container and equipment.
Packing List
• 1x Odalog G20 (or G20 RTx) unit
• 1x USB cable and 1x MODBUS cable
• 1x Grease (1 bottle)
• 1x Magnetic Hex Screwdriver
• 1x Calibration Adapter and 1-meter Flexible Hose
• 1x Standard Antenna (RTx only)
8 | Safety Precautions
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Safety Precautions | 9

The new Odalog G20 models are portable gas data
loggers designed for application in harsh environments,
such as the wastewater industry. This instrument is
corrosion-resistant, durable, and reliable, with superior
sealing and heavy-duty materials.
The new generation Odalog Logger picks up where its
respected predecessor left off. A new type of sensor, extra
memory, and communications options improve the user’s
experience and a longer deployment time.
Odalog G20
Odalog G20 is a low power logger which, coupled with a
long-life lithium cell power-source, has a battery life which
exceeds 9 months in most cases.
The new Bluetooth communication enables the user to
configure and download data from the Odalog unit. In addition,
MODBUS communication allows the user to integrate into
any SCADA.
The extra large, easy to read LCD makes the Odalog simple
to use and interpret instrument data and settings on-site.
The instrument main features can be viewed on-screen,
such as: gas readings, temperature, humidity, percentage of
memory used, logging mode and time intervals, as well as a
battery level indicator.
Odalog also interfaces with an easy to use software package,
OdaStat NX, that brings logged data into the office environment
in a user-friendly format.
Odalog G20 RTx
The new generation Odalog G20 RTx has a similar design to
the Odalog G20, using all of its features plus a new wireless
data transmission and extended battery life. With low power
consumption coupled with a Lithium D-cell power source,
battery life will exceed three months in most cases.
The new Bluetooth communication enables the user to
configure and download data from the Odalog unit. In addition,
MODBUS communication allows SCADA integration, and a 4G
modem provides remote data transmission.
The extra-large, easy-to-read LCD makes the Odalog simple
to use and interpret instrument data and settings on-site.
The instrument’s main features can be viewed on-screen, such
as gas readings, temperature, humidity, memory used, logging
mode, time intervals, and a battery level indicator.
The Odalog G20 RTx gas monitoring system utilizes a
4G modem to transmit gas concentration and other
parameters data to a dedicated FTP or FTPS server at the
selectable interval. The stored data is in the form of coded
binary files which PC-based software OdaStat NX can access
and decode into CSV files for further analysis.
Figure 3. Odalog G20
Figure 4. Odalog G20 RTx
Introduction General Specifications
Ensure the temperature range of 0°C (32°F) to 25°C (75 °F) and humidity between 20% to 80% RH when storing the
Odalog instruments.
Table 2. Product Specifications
Specification Odalog G20 Odalog G20 RTx
Operating Temperature -20°C (-4°F) to 50°C (122°F)
Operating Humidity 5% RH TO 95% RH
Dimensions¹ 76.5 mm (3.01”) x 175 mm (6.89”)
Ingress Protection IP66/68 (1 m/2 hr)
Power Supply D-Size Lithium Battery
Memory Micro SD card 8 GB SanDisk²
Data Logging Capacity Greater than 10 million data points
Logging Interval Logging Interval Selectable from 1 minute to 1 hour
Battery Run Time3Greater than 9 months Greater than 3 months
Communication USB, Bluetooth, MODBUS USB, Bluetooth, MODBUS, Modem
Transmission Interval N/A 30 minutes to 24 hours
Antenna N/A
Antenna: IP68
Frequency: 698-960 MHz / 1710-2710
MHz / 2500-2700 MHz
Dimensions: 163 mm (6.41”) X 21.5 mm
(0.85”)
Weight 720 g 800 g
1. Dimension without antenna for Odalog G20 RTx
2. SDSDQAF3-008G-XI
3. The expected runtime after installing a new battery, excluding the storage time
Table 3. Calibration Gas & Flow Time
Gas Range (ppm) Calibration gas1 Min Flow (ml/min) Flow time (mins)
H₂S 200 50 250-500 15
H₂S 2000 100 250-500 15
1. Recommended calibration gas level
10 | Introduction
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Introduction | 11

Table 4. H₂S Digital Sensor Specifications
Measurement 200 ppm 2000 ppm
Operating Principle Electrochemical
Accuracy 5% of measured value
T501Response Time <15 seconds
Output ppm with temperature compensation
Warm-up Time 20 seconds
Recovery Time2<180 seconds
Repeatability ±5% of the measured value
Orientation Sensitivity None
Communication UART
Range 0...200ppm 0…2000 ppm
T903Response Time <30 seconds <32 seconds
Overload41000 ppm 3000 ppm
Linearity Linear (±5% from linear, up to
200 ppm)
Linear (±5% from linear, up to
2000 ppm)
Resolution 0.1 ppm 1 ppm
Baseline offset5<±0.5 ppm H2S equivalent <±2 ppm H2S equivalent
Equilibrium Baseline (Shift from -40°C to +60°C) <±3 ppm <±10 ppm
1. Time required to reach 50% of target gas
2. Time required to reach 90% of target gas
3. Maximum concentration that can be reached before damaging the sensor
4. Time required to return near NULL after subjected to full range
5. The oset for fresh air calibration
Users will find within their new Odalog box as follows:
• 1x Odalog G20 (or G20 RTx) unit
• 1x USB cable and 1x MODBUS cable
• 1x Grease (1 bottle)
• 1x Magnetic Hex Screwdriver
• 1x Calibration Adapter and 1-meter Flexible Hose
• 1x Standard Antenna (RTx only).
The users should locate the QR code in the yellow label
covering the Odalog unit. Please scan the QR code to
download the manual and any supporting documents
or software.
The following steps will assist users for the first time.
First Deployment
OdaStat-NX installation
1. Download the OdaStat-NX software and install it on your
PC, ensure to get the latest software version from
our website.
2. Connect the USB cable if you wish to establish a
wire connection to the PC or opt-in for the Bluetooth
connection (standard Bluetooth ID is ODA02).
Switching ON
1. Turn the Odalog unit ON by positioning the magnetic
screwdriver tip near the “Menu” marking on the yellow
label; hold it there and wait until the display shows
ON2 – ON1 – ON, then remove the magnet. The correct
magnet position is at the lower “Menu” print.
2. The unit will enter the startup sequence, showing the
current setting (factory setting), then it will end with INST
on display.
3. The unit should start reading gas and show the value in the
INST screen.
USB Connection
Users can find more information in the "OdaStat NX" section
of the manual.
1. If you plan to use a USB cable, place the magnet tip near
the “Menu” marking again; the menu will scroll at
2-second intervals.
2. Remove the magnetic tip when the display shows UART.
3. Connect the USB cable to the PC and run the
OdaStat-NX software.
4. In the OdaStat-NX, change the connection setting to USB
and click the “Connect” button.
5. The COM will appear automatically, and clicking the other
Connect button will show a successful connection pop-up,
followed by the “Login” window.
6. Use the default “Admin” for both username and password
to gain access to the unit.
Bluetooth Connection
Users can find more information in the "OdaStat NX" section
of the manual.
1. If you plan to use Bluetooth, the factory default ID
is ODA02.
2. Place the magnetic tip near the “Menu” marking on the
yellow label, hold it there until “BLE” appears, then remove
the magnetic tip. You will see a blinking symbol on the
Odalog's display.
3. In the OdaStat-NX, change the connection setting to
Bluetooth and click the “Connect” button.
4. The Bluetooth ID will appear in the left “Unpaired” list.
Click the “Pair” button underneath the list, and the ID will
move into the “Pair” list on the right.
5. Click the “Connect to device” button underneath the “Pair”
list to establish the connection.
6. A successful connection pop-up will appear, followed by
the “Login” window.
7. Use the default “Admin” for both username and password
to gain access to the unit.
Configuration
1. Determine the sampling interval for the measurement
(default is 10 minutes). Please note that a shorter interval
will drain the battery faster.
2. You can select five parameters for logging. These are:
H₂S, Temperature, Humidity, Battery Voltage, and
Sensor Diagnostic. For G20 RTx modem signal strength is
also available.
3. There are two choices for temperature units, Celsius
and Fahrenheit.
4. Sensor Diagnostic will provide Due EOL¹ and Due Cal²
which are useful only via MODBUS communication.
Quick Start Guide
Odalog Portable Gas Loggers
Quick Start Guide | 1312 | Introduction
Odalog Portable Gas Loggers

1. Due EOL means the sensor end of life in days, When the value reaches 0 the sensor can no longer
read the target gas.
5. MODBUS: for G20 and G20 RTx using MODBUS, we
recommend to use a StartAddress and a DeviceID of 1
and a baudrate of 9600. Please note that for G20 RTx,
MODBUS and 4G Modem are mutually exclusive; users
can only make one selection.
6. For G20 RTx, using the 4G Modem, ensure the antenna
installation has been completed and then, set up the 4G
Modem and the Alarm triggers:
• The Modem Settings include the Access Point Name
(APN), the FTP Server Setting and SMS information for the
receipt of Alarms
• The Alarm Triggers allow users to set LOW, AVERAGE, and
HIGH gas concentration threshold values, to trigger an
email or SMS message.
Note that the Odalog software does not automatically activate
the Modem. Please follow the next step to start the modem.
Enabling the Modem (G20 RTx)
1. The G20 RTx unit will not send data or SMS message after
the initial configuration nor on first enabling logging; you
must also enable the Modem on the unit.
2. Place the magnetic tip near the “Menu” marking on the
yellow label, hold it there until “Transmit ON” appears, then
remove the magnetic end.
3. G20 RTx will send a TEST SMS when enabling the
modem for the first time and then send FTP data per
the transmission interval. An SMS trigger will happen if
gas level alarm is set in the configuration and a trigger
threshold is reached.
Care of the Odalog G20
Unit Retrieval
The new Odalog G20 unit can be deployed in the field for up
to 3 months before needing to dry the sensor3. At this time, the
unit may require battery replacement.
NOTE: When deployment time of G20 depends upon the site
temperature/humidity and the sampling rate. Humidity affects
the sensor, while the temperature and sampling time affects the
battery consumption.
When retrieving the unit from the field, please ensure to carry
out a decontamination process and clean the unit before doing
any work.
Downloading the Data
Users can download the data directly from the unit using a USB
cable or Bluetooth connection. It is also possible to retrieve the
data from the FTP server via the OdaStat-NX application.
Users can check the data download details in this manual
within the “OdaStat NX” section.
Drying the Sensor
After retrieving the unit from the field, a drying process must
commence to removing excess moisture from the sensor.
A rule of thumb, the drying time should equal the
deployment time.
For example, if the deployment time is 75 days, the drying time
should use the same time frame in an air-conditioned room
(humidity approx. 50%). Utilizing a special drying chamber
(chamber humidity approx. 25%) can reduce the drying time
by 30%.
2. Due Cal is the sensor recalibration flag. When the value reaches 0 the sensor can no longer read
the target gas.
3. Electrochemical cells need a drying cycle in between deployment periods for removing the
absorbed humidity.
Odalog Display
This section describes a brief operating procedure for the
Odalog G20 and G20 RTx, covering the basics of all
primary functionality. These functionalities are accessible
from the screen menu; use a magnetic tipped screwdriver to
make your selection.
There are three locations for the magnetic switches: "Menu"
and "No" on the right side of the screen, and "Yes" on the left
side of the screen (see Figure 5).
Figure 5. Front Label
LCD Layout
Figure 6. 7-Segment Display
Following are the parameters displayed on the LCD of the
Odalog loggers:
1. Lower 7-segment characters: Displays gas readings
and status values which are usually numerical digits, some
supplemental menu headings and prompts.
2. Upper 14-segment characters: Displays menu
headings, prompts and other visual feedback, usually
alphabetic characters and some numerical values
displayed on screens.
3. Battery Level Indicator: It displays the battery levels in 4
stages of depletion.
Figure 7. Four Stages of Battery Depletion
Operation
P1, P2, and P3 are the segments to display the battery
percentage, as shown in Figure 7. The battery percentage
display appears on all screens.
• Stage 1 have the logging and communication active
(voltage > 3.2 V).
• Stage 2 have the logging and USB communication active;
the Bluetooth may become inactive after some time
(3.2 V > voltage > 3.1 V).
• Stage 3 have the logging active but no communication
(3.1 V > voltage > 3.0 V).
• Stage 4 have all functions inactive (voltage is ≤ 3.0V).
4. Communications Symbol: This symbol indicates if
the instrument is enabled, or successfully connected, or
transferring data.
• On G20 RTx’s INST screen: The symbol may also
indicate the approximate “signal strength” of the last
transmission to the FTP server.
5. Logging Symbol: This symbol flashing indicates that the
instrument is Logging.
Note: Flashing interval does not indicate
logging interval.
6. % (Percentage): This symbol shows any units or
screens that display units as a percentage (not used at
this moment).
7. °C/ °F (Temperature units): These symbols indicate the
temperature readings on the screen in degrees Centigrade
or Fahrenheit, depending on the setting chosen in the
Odastat-NX software package [Default = ºC].
8. ppb/ppm (Gas Reading units): These symbols indicate
if gas readings shown are in “parts per million” or “parts
per billion”. [‘ppb’ is disabled in Odalog Logger G20 and
G20 RTx series instruments].
Odalog Portable Gas Loggers
Operation | 1514 | Quick Start Guide
Odalog Portable Gas Loggers

Switching ON
Users need to use a magnetic tip screwdriver to switch the unit
ON and hold the tip at the MENU until the screen shows an
“ON3” counting down:
Figure 8. Switch ON Display Change
Odalog G20
Main Menu
When the users hold the magnet at the MENU after switching
ON the unit, a series of the menu will appear. Keep holding
the magnet to scroll through the menu; remove the magnet to
initiate the selection. The following Figure 9 shows the menu
selection in the Odalog G20.
Figure 9. The Odalog G20 Menu Sequence
• INST: This screen displays the instantaneous gas reading
in ppm (parts per million) units.
• STATUS: This screen scrolls through overview of
Instrument data.
Figure 10. The STATUS Screen of G20
SWVER: The unit firmware version
PEAK: Maximum reading (logging enabled)
CLOCK: The current time in 24 hours format.
TEMP: The current temperature reading.
BATTERY: The remaining battery voltage.
MEMORY: The size of free memory on SD card.
SECOND: The measurement intervals.
CALGAS: The current calibration gas level.
DUEEOL: The remaining time in days until the end of the life of
the sensor.
DUECAL: The remaining time in days until the
next recalibration.
MODBUS: Status of MODBUS communication, 0=disable,
1=enable.
BPS: The port baud rate setting will appear when the
MODBUS status is 1.
HUMD: The current humidity reading.
• START LOG: This screen enables logging of the data.
The LOGGING symbol confirms the selection, flashing on
the screen.
Figure 11. Start Log
STOP LOG: When Odalog is logging data (“LOGGING”
symbol is showing) use the below sequence to cease logging:
Figure 12. Stop Log
• UART: This screen enables a USB (Universal
Asynchronous Receiver-Transmitter) link for communicating
with the Odalog instrument. Users can utilize the USB
cable to communicate with the unit.
COMSTR will appear if there was no active UART and
COMSTP appears if UART is currently active. Users need to
confirm the selection by swiping the magnet on the Y or N
selection. Failure to confirm will result in cancellation
(see Figure 12).
Figure 13. UART ON/OFF Setting
• BLE: This screen enables or disables Bluetooth Low
Energy (BLE) links for communicating with the
Odalog instrument. For the first time, users can use a
default ID of ODA02. COMSTR will appear if there was no
active Bluetooth and COMSTP appears if Bluetooth
is currently active. Users need to confirm the selection
by swiping the magnet on the Y or N selection.
Failure to confirm will result in cancellation.
Figure 14 shows a Bluetooth ID of ODA01.
Figure 14. Bluetooth ON/OFF Setting
• NULL: This screen is used to start the calibration of the
sensor against fresh air. This process is usually carried out
prior to SPAN calibration. An extra confirmation requires
the users to swipe a magnet on Y. Failure to confirm will
result in cancellation (see Figure 15).
Figure 15. NULL Screen
• SPAN: Selection of this screen will start the calibration
of the sensor in specific calibration gas. Please check
the recommended calibration gas against the unit
measurement range in Table 2. An extra confirmation
requires the users to swipe a magnet on Y. Failure to
confirm will result in cancellation (see Figure 16).
16 | Operation
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Operation | 17

Figure 16. SPAN Selection
• RESET: This screen is used to reset the unit after NULL
and SPAN calibration or if one or more functions failed
(i.e.: logging).
IMPORTANT NOTE: Perform NULL calibration first before
SPAN, then RESET the unit.
Extra Menu
There are several functions that are accessible from the
OFF screen. Users will need to keep holding the magnet at the
MENU past the 7-segment display initialization screen
(all segments in the display will light up). See Figure 17 for the
detailed menu.
• UART: This screen enables a USB (Universal
Asynchronous Receiver-Transmitter) link for communicating
with the Odalog instrument. Users can utilize the USB
cable to communicate with the unit.
• BLE: This screen enables Bluetooth Low Energy (BLE)
links for communicating with the Odalog instrument.
For the first time, users can use a default ID of ODA11.
• Clear Log: This menu selection will cause the data
deletion from memory. Use this function with caution.
Figure 17. Extra Menu Accessible from OFF Screen
Odalog G20 RTx
Main Menu
A series of menus will appear when the users hold the magnet
at the MENU spot after switching ON the unit. The G20 RTx
menu has one more function, which enables the modem
(TRNSMT); the other functions are the same as the G20 unit.
Figure 18. The Odalog G20 RTx Menu Sequence
Keep holding the magnet will scroll through the menu and
removing the magnet will initiate the selection. The above
Figure 18 shows the menu selection in the Odalog G20 RTx.
The extra function in the menu display has the following
description (check the other functions descriptions following
Figure 10–Figure 17):
• STATUS: This screen scrolls through an overview of the
Instrument data of G20 RTx, including a few extra statuses
related to the modem. The following are the new extra
statuses (check and compare with the G20 statuses in the
description in Figure 10):
– ALARMA: (Alarm Average) This screen displays the high
gas level alert from data averaged over a 12-hour
rolling window.
– ALARML: (Alarm Low) This screen displays the high gas
level alert, reaching the lower peak value set in
the software.
– ALARMH: (Alarm High) This screen displays the high
gas level alert, reaching the higher peak value set in
the software.
– SIGNAL: This screen displays the GSM signal strength
of the last successful SMS or data transfer.
– TRNSMT: This screen displays the transmission interval
set in the configuration (the interval of FTP transfer).
• TRNSMT: This screen enables/ disables the transmission
through the 4G modem. There are three sub-functions
following this:
– TRNSMT ON: Will enable the transmission; users
will see this selection if there is no previous active
transmission (see Figure 20).
– TRNSMT OFF: Will disable the transmission; users
will see this selection if it is active (see Figure 21).
– TRNSMT Last: Will repeat the last transmission; users
will see this screen when there is no active transmission,
and there was an attempt of data transfer previously
(success or failed) (see Figure 22).
STATUS ODALOG
G20
SWVER
1.5.6
PEAK
0.0ppm
CLOCK
12:50
INST
0.0ppm
TEMP
24.1
BATTERY
3.570
MEMORY
7GB
DUEEOL
1670
DUECAL
252
MODBUS
0bPS
ALARMA
10.0 ppm
ALARML
15.0 ppm
ALARMH
25.0 ppm
SIGNAL
34
TRNSMT
00:15
SECOND
60
CALGAS
33.0 ppm
HUMD
48.5
INST
0.0ppm
°C
HOLD
Figure 19. The STATUS Screen of G20 RTx
Figure 20. Transmit ON
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Figure 21. Transmit OFF
Figure 22. Transmit Last
IMPORTANT NOTE:
1. When enabling the transmission (TRNSMT ON),
the logging will automatically activate; disabling the
transmission (TRNSMT OFF) will deactivate the logging.
2. The modem signal reading is available on a successful
transfer activity either SMS or FTP transfer.
3. Upon enabling the transmission for the first time, the unit
will send a Test SMS if the destination number is available
(set up in the configuration).
4. SMS trigger is based on alarm setting (ALARMA,
ALARML, ALARMH), while FTP trigger is based on the
configuration setting.
5. The “Transmit Mode” should be turned o before
calibration, as any transmissions to the server will cause
any NULL or SPAN screens to be canceled.
Communications
USB and Bluetooth
USB and Bluetooth are the G20/G20 RTx main
communication features.
USB Connection
There is a special 1-meter USB cable which users can connect
to the M8 connector on the unit’s Top Cap. Upon a connection
to a PC, it will trigger a USB driver installation.
Users should select UART mode per Figure 13 and then
establish a connection via OdaStat-NX (Figure 27).
We recommend on using this USB connection for your choice
of configuration, data download and firmware upgrade.
Bluetooth Connection
Bluetooth is the secondary choice of communication; however,
the connection may not be possible if there is a strong Wi-Fi
signal nearby.
Users should select BLE mode per Figure 14 and then
establish a connection via OdaStat-NX (see Figure 27).
The default ID is ODA11.
If required, users may enable Bluetooth function at periodic
time on configuration setting (see Figure 34). For example,
if the Bluetooth wake up interval is 15 minutes, then every
15 minutes the unit will enable Bluetooth automatically for
30 seconds waiting for a connection. If a connection was
established, it will stay on until disconnection.
MODBUS
The Odalog G20 series has a MODBUS connection suitable
for integrating into a control/ monitoring system such as a
dosing system. This integration will allow an automatic process
in utilizing the H₂S reading.
One of the cables supplied with your Odalog unit is a 4-wire
MODBUS cable a connector to the G20 at one end and
bare leads at the other. The users need to use a full duplex
configuration when connecting to the host. Figure 23 shows
the cable color guide.
Wiring Configuration
Figure 23. RS-485 Wire Color Guide
The standard MODBUS cable length is 1-meter; please use
an extension wire to increase the connection length to the
host controller. Please ensure proper termination.
Figure 24. ATEX Safety Barrier
If the users plan to install the unit in a hazardous environment
with an explosive atmosphere (containing a high concentration
of H₂S), they must utilize an additional ATEX safety barrier
module (see Figure 24).
This module will provide an extra safety between the ATEX area
(site) and non ATEX area (enclosure/ control unit), preventing
any possible current that can cause a spark from travelling from
non-ATEX area.
G20 MODBUS Setting
To enable MODBUS output, users must enable it in the
G20 configuration. G20 and G20 RTx models both have
MODBUS output; although specific to G20 RTx, users cannot
use the internal modem while enabling the MODBUS output.
In the OdaStat-NX, users must establish a connection before
accessing “Instrument Parameters” to program the unit.
Within “G20 RTx Communication Setup”, there are two
communication options.
Users need to choose MODBUS to access its setting.
Starting parameter address should start with 1; users can
choose any starting number. However, this number has shifted
by 1 to the standard starting register for MODBUS. In the
back-end process, if the user sets the starting address to 1, the
MODBUS polling from the host PC/ controller/ PLC should use
starting address 0.
• Address: 1 (recommended)
• Parameter address: 1 (recommended)
• Baud: 9600 (recommended)
• Port Setting: 8N1
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Table 5. Parameters List
Register Parameters Type
0H₂S Float
2Temperature Float
4Humidity Float
6Battery (mV) Int
7Battery (%) Int
8Due EOL Int
9Due Cal Int
The recommended baud rate is 9600; any higher baud rate
may increase the timeout response from the host. If users want
to use a higher baud rate, please ensure to trigger a retry when
a timeout occurs.
The unit uses data bit 8 and stop bit 1, parity none, and flow
control none.
The first three values (H2S, Temperature, and Humidity) use a
2x 16-bit register in IEEE754 floating format; the rest occupies
a 1x 16-bit register in UINT format and MODBUS function 3
(the Holding register). The values have the following sequence
regardless of which parameters are enabled by the user:
The MODBUS reading has no relation to the enable logging
selection since the memory will retain the last reading value.
Users can poll the last measurement value independent of
the logging time. However, the updated value will follow the
logging time.
MODBUS Detailed Format
Assuming the sensor has the MODBUS slave address of 2, and
the users want to extract all 10 values:
Query (Host to Odalog):
09 04 00 00 00 0A 71 45 02 03 00 00 00 0A C5 FE
• 09 represent the MODBUS slave ID
• 04 represent MODBUS function 4 (Input Register)
• 00 00 represents the data starting address (0)
• 00 0A represents the number of the requested register (10)
• 71 45 represents the CRC check
Response (Odalog to Host):
09 04 14 00 00 00 00 F8 60 41 DD FF E0 42 88
0E 19 00 64 00 00 00 00 61 5B
• 09 represent the MODBUS slave ID
• 04 represent MODBUS function 4 (Input Register)
• 14 represent the reading register count
• 00 00 00 00 represent H₂S reading in reverse endian
• 00 00 00 (0 ppm)
• F8 60 41 DD represent Temperature in reverse endian 41
DD F8 60 (27.74 °C)
• FF E0 42 88 represents Humidity in reverse endian 42 88
FF E0 (68.50%)
• 0E 19 represents Battery Voltage in mV 0E 19 (3609 mV)
• 00 64 represents Battery in percentage 00 64 (100%)
• 00 00 represents Due EOL in days 00 (0 days)
• 00 00 represent Due Cal in days 00 00 (0 days)
• 61 5B represents the CRC check
Modem (G20 RTx)
The modem in G20 RTx is a 4G variant with the capability to
send SMS alarms and data to FTP or FTPS.
The FTP feature supports TLS 1.2 using the Advance
Encryption Standard (AES) Sha-256. The unit will request an
Explicit Mode from the server (requesting the server to create a
secure session) on port 21 before transferring the data.
Please pay attention if there is a PIN on the SIM card. You can
set the PIN number in the configuration or choose to disable it.
To disable the SIM PIN, you will need to use an external device
(i.e., a mobile phone).
FTP Transfer
The FTP transfer will follow the modem wake-up interval,
which is set in the configuration. We recommend setting the
wake-up interval daily (24 hours) to maximize the battery life
and deployment time.
You will need to set the APN, which will give a data connection
to the network.
Please check if the destination server is a common FTP server
(FTP) or with a secured layer (FTPS). You may assign any port
for the former but only port 21 for the latter.
You will need to have a folder ready on the server, which
reflects the path in the configuration.
SMS Alarms
An SMS alarm will occur on the first enabling of
communication, or when there is an alarm event, such as the
reading reaching a certain limit set in the configuration, or if
the sensor has an issue and needs attention. Please ensure
to address all of the alarms, as failure to do that may cause an
unexpected danger.
You can have one up to three destination numbers for SMS.
There are several SMS variations depending on the unit status:
Test SMS
This occurs when the users enable the unit transmission for the
first time, the unit will send an SMS to all registered destination
numbers in a format per the following example:
45210021,SITE#Sewer1,BATT#100%,EOL#1664,CAL
DUE#95,AVAMEM#7GB
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• 100% is the battery level percentage
• 1664 is the number of days before the sensor end of life
• 95 is the number of days before calibration is due
• 7 GB is the available memory size.
Low-Level Gas SMS
This occurs when the reading is above the setting of the low
gas threshold. For example:
45210021,SITE#Sewer1,PRESCONST#55,THRESHOLD#50
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• 55 is the current gas reading
• 50 is the low threshold level.
High-Level Gas Alert SMS
This occurs when the reading is above the setting of the high
gas threshold. For example:
45210021,SITE#Sewer1,PRESCONST#102,
THRESHOLD#100
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• 102 is the current gas reading
• 100 is the high threshold level.
Alarm/ Alert Restored SMS
This occurs when the reading return below both low and high
gas threshold. For example:
45210021,SITE#Sewer1,PRES CONST#36
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• 36 is the current gas reading.
Sensor Bad 1 SMS
This occurs when the sensor runs out of electrolytes
(drying out). The user will need to remove the unit from the site
and keep the unit in a wet environment with humidity above
70% for a few days. If it does not work, replace the sensor.
45210021,SITE#Sewer1,Sensor Bad #1
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• Sensor Bad 1 is the current sensor status.
Sensor Bad 2 SMS
This occurs when the sensor electrolyte is overflowing (too
much water). The user will need to remove the unit from the site
and keep the unit in a dry environment with humidity between
10-20% for a few days. If it does not work, replace the sensor.
45210021,SITE#Sewer1,Sensor Bad #2
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• Sensor Bad 2 is the current sensor status.
Low Battery Alarm SMS
This occurs when the battery falls below 50% (3.2 V).
45210021,SITE#Sewer,BATT#20%
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• 50% is the battery percentage level equal to 3.2 V.
Low Memory Alarm SMS
This occurs when the remaining free memory falls
below 32 KB.
45210021,SITE#Sewer1,AVAMEM#32KB
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• 32 KB is the remaining memory capacity.
22 | Communications
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Communications | 23

Sensor replacement due in 10 days Alarm SMS
This occurs when the due time for sensor replacement is within
ten days.
45210021,SITE#Sewer1,REPLACE SENSOR WITH IN 10
DAYS
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• “Replace sensor within 10 days” is a 0-day warning for
replacing the sensor.
Calibration due in 10 days Alarm SMS
This occurs when the scheduled time for sensor calibration is
within ten days.
45210021,SITE#Sewer1,CALIB SENSOR WITH IN 10 DAYS
Explanation:
• 45210021 is the unit serial number
• Sewer1 is the site identification name
• “Calib sensor within 10 days” is a 10-day warning for
calibration of the sensor.
OdaStat NX
Home Screen
Figure 25. Odastat NX User Interface
Figure 25 shows the Home Screen of the OdaStat NX; users
may access each software function directly. There are four
main areas within the Home Screen:
• The Top Menu (1) provides access to the selected
features; this menu is suitable for users familiar with the
drop-down style.
• The Selector (2) allows users to choose the type of
connection, either USB or Bluetooth.
• The Main Menu (3) has similarities to the previous OdaStat
version, making it easier for the users to access the
required function.
• The Action Page (4) is where the users provide input/
settings to the unit.
USB Connection
To establish a USB connection first select connection type
USB, set the G20 unit into UART mode, and finally click the
Connect (yellow button) (see Figure 26).
The Device Connection Setting will appear with automatic
detection on the port number. Click the Connect (blue button)
to establish a connection (see Figure 27).
Figure 26. USB Selection
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Figure 27. USB Connection Setting
A new window will pop-up to indicate a successful connection
(see Figure 28), followed by a login page (see Figure 29).
Users can use Admin for both username and password for the
first time.
Figure 28. Successful Connection Pop-up Window
Figure 29. Login Page
Bluetooth Connection
There is no need to manually pair via your computer as the
OdaStat-NX will do both pairing and unpairing.
Figure 30. Bluetooth Selection
To establish a Bluetooth connection first select connection
type Bluetooth (see Figure 30), then set the G20 unit into BLE
mode, and click Connect (yellow button).
The “Bluetooth Device Management” window will appear
with automatic detection on the Bluetooth name of the unit
(default ODA11), which will appear within the “Unpaired
devices” window (see Figure 31).
Figure 31. Unpaired Device Window
Users can click the unit Bluetooth name and then “Pair device”
(blue button) to make a pairing to the PC. There is no need to
have a pairing key as the OdaStat-NX will handle it internally.
The Bluetooth name will move to the “Paired devices” window
on the right.
To establish a connection, users need to click the unit
Bluetooth name again and click the “Connect to device” button
(see Figure 32).
Users can connect to more than one device as long as each
device has a different Bluetooth ID1. After the established
connection for the first time, the OdaStat-NX will keep the
information next time.
Once a successful connection has been established, the
Successful Connection Pop-up window will appear (Figure 28)
followed by the Login Page (Figure 29).
Figure 32. Pairing and Establish a Connection
The Main Menu
The menu on the left of the Home Screen retains similarities
with the previous OdaStat software. This includes the interface
for setting up the Odalog unit, time setting, downloading, and
displaying the data.
1. The system can handle the same Bluetooth ID but it is impossible to check the unit serial number.
Set Date and Time
This menu allows users to see/adjust the current unit date
and time of a connected Odalog. Users may set the unit
time/date manually and click the “Set User Date Time” button,
or use their computer as a reference by clicking the “Set unit to
PC time” button (see Figure 33).
Figure 33. Date and Time
Instrument Parameters
One of the menus on the left of the Home Screen is the
“Instrument Parameters” which allows the users to program
the Odalog. There are three tabs on the “Instrument
Parameters” screen: “Main,” “Manufacturing,” and “Modify
User Detail” (see Figure 34).
Figure 34. Complete Instrument Parameters for G20 RTx
Main
The Main tab consists of all settings for the operation of the
Odalog unit:
Site ID
The site ID is used to identify the instrument and the
deployment location. The default site ID is SFC which stands
for Standard Factory Configuration.
Logging Setup
• WakeUp Time Interval—Set the time interval (in minutes
and seconds) between the collection of each data sample
by the Odalog. The default value is 10 minutes, with
minimum eective interval at 30 seconds. We recommend
on using an interval greater than 1 minute.
• Check the boxes for the parameters (H2S, Battery and
Humidity) you want to log.
IMPORTANT NOTE:
1. At this stage, there is no output for SensorDiag parameters
into a file.
2. A shorter sampling interval will cause a shorter battery life.
Instrument Setup
• Calibration Gas Value – Enter the gas value in this box,
in ppm.
• Alarm Settings – These controls allow the users to set
LOW, AVERAGE, and HIGH gas concentration threshold
values, in ppm.
When the measurement exceeds these values, the
instrument will notify the user via email or SMS to a
cellular phone.
• Auto Log – This setting will enable logging right after
sending the program.
Bluetooth Settings
• Bluetooth Name – The first three characters have been
predetermined to ODA; users may set the remaining two
as numbers up to 99. The default factory setting is ODA11.
• Bluetooth Wakeup Interval – Set the time interval for
the Bluetooth to wake up. Users may set it to 0 to disable
automatic Bluetooth wake-up.
Temperature Setup
Users can select to log the unit temperature and can set the
measurement unit, either Celcius or Fahrenheit.
Communication Setting
Select the communication type for the unit. The G20 unit
allows MODBUS communication only; the 4G modem is
not selectable. G20 RTx allows mutually exclusive 4G Modem
or MODBUS communication.
Figure 35. MODBUS Option Enabled
When MODBUS is selected, the following functions are
applicable per Figure 35:
• Register Start Address – users can define the
start address.
• Device ID – users can set the Slave ID of the unit; thus,
linking more than one G20 unit is possible.
• Baud rate – the selection of port speed, available on
9,600; 19,200; 57,600; and 115,200
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Odalog Portable Gas Loggers Odalog Portable Gas Loggers
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Figure 36. Modem Option Enabled
When modem is selected (G20 RTx only), the following
functions are applicable (Figure 36):
• Modem Signal Strength—this option enables users to
log the signal strength.
• Modem Wakeup Interval — this setting allows the data
transmission interval.
• Mobile Numbers — there are three destination numbers
available for SMS alarms.
• Current SIM PIN — users can set the SIM PIN using this
option in conjunction with the “Use SIM PIN” option.
• Change SIM PIN — users can change the SIM PIN
utilizing this option; an additional “New SIM PIN” window
will appear next to the “Current SIM PIN”.
• FTP/ FTPS Server — use this setting to set the type of
FTP server destination; the selection also relates to FTP
Server Link, FTP Username, FTP Password, and FTP Port.
• APN Setting — set the Access Point Name to gain data
connection from the SIM card and check the appropriate
APN from the service provider. Some private APNs may
need to use APN Username and APN Password.
At the bottom of the interface, there are three buttons: Save to
File, Load from File and Configure Device.
• Save to File — to save the configuration to the computer.
It has a specific file format as follows:
CmmddyyyymmddyyyThhmm_siteid.cfg.
The C indicates the configuration; the time mmddyyyy and
hhmm will follow the unit’s current date (month-date-year)
and time (hour-minute), T is the separator between date
and time, and siteID is the unit’s name.
Load from File — users can use the saved configuration
to populate the interface, but it has yet to enter the Device.
It has a similar function to Open Parameter File from the menu;
the users will not see the directory structure but the list of
configurations directly (see Figure 37).
Configure Device — users can send the configuration to the
Odalog unit. After the users are satisfied with the setting, they
can click this button.
IMPORTANT NOTE: User has to create a folder they
have specified in the path for Save to File and
Load from File function.
Figure 37. Config File List
Manufacturing
The Manufacturing tab has the information about the unit, the
Model, the Firmware version, the Sensor type, and the Unit
serial number (see Figure 38).
Figure 38. Manufacturing Tab
Modify User Details
Users can change the login information from this tab; the
username and password limit to 5 characters (see Figure 39).
Figure 39. Modify User Details Tab
Open Parameter File
This feature has a similar function to the Load from File button
in the Main tab of the Instrument Parameters. It requires a
connected unit to access the File, it will open the default
directory structure, and when users open a file, it will appear
as Figure 34.
Download Log
Users can access this function after successfully connecting to
a unit. A “Download Log” button allows the users to download
the unit data (see Figure 40).
Figure 40. Download Log Interface
While the instrument is downloading, the user may still
navigate and use OdaStat NX’s non-communication functions,
e.g., viewing a graph. However, options such as Setting Date
and Time and Instrument Parameters will be disabled.
Figure 41. Download Completion Pop-up
The OdaStat-NX will save the downloaded data with the default
file name of DmmddyyyyThhmm _UnitSN.olg. The D in the
name indicates Data File, with mmddyyyy and hhmm following
the current unit date (month-date-year) and time (hour-minute),
T is the separator between date and time, and the UnitSN is the
unit’s serial number. The users will receive an announcement
with that file name and its location (see Figure 41).
Please note this download log function will download the last
session only.
IMPORTANT NOTE: If the users try to download the data for
the second time, the same file name will be used if the action is
taken within a minute, otherwise the OdaStat-NX will create a
new name.
Clear Log
The clear log function is accessible from any window or
function and does not have a particular interface; however,
when users click this function, they will see a pop-up window
asking for confirmation to clear the data from memory
(see Figure 42).
Figure 42. Clear Log Pop up Window
Open Log File
Users can choose the “Open Log File” function to access
previously downloaded data; it will open the default log data
directory (see Figure 43). Only an OLG file created by the G20
unit is compatible with this function.
Figure 43. Accessing the Default Directory for Odalog Data
After file selection, the OdaStat-NX will load the file into the
“Session Selector,” there is no need to repeat the process as
any session recorded in the “Session Selector” will stay even
after the users close the OdaStat-NX application.
Session Selector
The Session Selector will list all the registered sessions in
the OdaStat-NX (see Figure 44); it shows the list of file that
is currently in C:\Users\Public\OdaStat-Files\ folder location.
An entry will be created after you download the data from
Odalog unit or copy paste a file into that folder (file taken from
other PC). File deletion will remove the entry from the list.
Users can choose to view one or multiple sessions; the latter is
like “Joined Session” in the old OdaStat. The Chart will display
data from all the ticked sessions.
Figure 44. List of the Session in Session Selector
Connect to FTP Server
Users can access the data stored in their FTP server (G20 RTx)
using this menu after providing the server credential.
(see Figure 45). It will show the directory list in the server,
choose the correct directory to get the data (see Figure 46).
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Figure 45. The FTP Client Credential
Figure 46. Folder List and File Functions
There are three functions to use:
• Open Data File — to view of the list of uploaded data in
the server; users can select one or more to download the
data as an OLG file.
• Delete Data File —to delete the chosen File; use this
with caution.
• Online Parameters — This provides an interface to
modify the existing program; the modification will occur on
the following data transfer during which the unit will pick
up and apply the new setting (see Figure 47).
Figure 47. Online Parameters
File Preference
The file preference function is accessible from the Top menu;
it controls the folder’s location for saving the data log files,
config files, the Chart, and the certificate files (see Figure 48).
Figure 48. File Location Preferences
Production Tools
Production tools is used to set the unit model and serial
number, it is not available for users.
Firmware Update
This function allows the user to update the Odalog G20
firmware, the process is available through UART only
(grayed out when using Bluetooth).
Chart
Figure 49. Data View on the Chart
Users can see the data as a chart (see Figure 49) via
Session Selector. There are four important sections in the
chart interfaces:
• The menu (1) provides access to extra export functions
such as PNG, PDF, and CSV; users can also save the
whole charts as another session (have more than
one session).
• The menu allows users to view one or more selected data
sets for a better focus. Users can view the statistic of up
to four individual parameters such as temperature,
humidity, H₂S and battery level (see Figure 50).
An additional analysis chart for the T90 process is
available to understand the sensor better.
• Chart (2) shows the data as a line chart; the number of
data depends on the parameter’s selection. Moving the
mouse slider up/down will allow the user to zoom in and
out of the Chart. The default parameter for zooming
is temperature.
• The Chart has a time as the X-Axis and the default title of
“Sensor Data Chart”. Users can see the unit serial number
and Site ID as the sub-title.
Figure 50. Statistic Data from Four Parameters
• The axes (3) show the value ranges of the data; moving
the mouse slider on the selected axis will allow zooming
on that data.
• The chart legend (4) indicates the displayed parameters,
including the start and end time/date.
NOTE: having more data on the Chart will slow down the
zooming function.
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Unit Care
Deployment
Installation
• Avoid direct sunlight:
Positioning the instrument in a shady/sheltered area
where possible helps to avoid the elements affecting your
data’s accuracy.
• Securely fasten when deployed:
It’s a good idea to chain and padlock your instrument in
place if it’s situated in a publicly accessible area.
• Keep it dry:
If used in a wet-well situation, ensure the instrument is
situated above the ‘high-water’ mark; the instrument is not
meant to be submerged.
Reading Accuracy
• Gas nature:
Users need to consider the nature of the measured gas;
some gases are ‘heavy’ and will naturally accumulate close
to the floor/ground.
• Ventilation - Striking a balance:
Users need to strike an airflow balance. The air
movement in the deployment area can affect the gas
accuracy measurement.
Ensure sufficient airflow to allow natural diffusion of target
gas to where the instrument is taking readings. Too much
airflow may mean target gas passes too quickly over the
sensor for the sensor to respond.
• Heavily shielded areas:
It’s common for the Odalog to be placed into areas
covered by thick concrete and/ or metal covers. For the
G20 RTx, it is essential, however, that the modem can still
transmit when deployed. Ensure reliable communication
continues during ‘startup’ mode when all covers/lids are
closed on the area. If the open-air signal is poor, the signal
on a shielded deployment area is likely even worse.
MODBUS Installation
The unit complies with ATEX certification for deployment in the
explosive atmosphere. To utilize the MODBUS connection,
the users must add a safety barrier unit to bridge between
the explosive area (installation site) and the non-explosive
area (control panel). This barrier device (ATEX-rated
Galvanic Isolation barriers) will protect electrical signals
from causing ignition. Please refer to Figure 24 for an example
of implementation.
We do not have any recommended brand for the barrier; users
can use any barrier model that deems ATEX certified.
Getting the Signal (G20 RTx)
The signal strength shown on the STATUS screen in
percentage (%), the signal bar on the display, and in the data
file are not real-time measurements.
The “value” shown is based on the signal measurement when
the modem started for FTP transfer.
• Surface Mount Antenna:
Use the Odalog Surface Mount Antenna (optional
accessory) for deployment areas to improve signal strength
in applications where the signal is poor or unreliable.
This antenna will also help to improve battery life, as
improved signal strength results in less power usage.
• Signal Interference:
The G20 RTx uses wireless transmission to connect to the
internet server. Communication can sometimes be
disrupted by similar devices and by electrical interferences
from nearby equipment.
Ensure the Odalog is not placed near high voltage cables
or electrical machinery (e.g. pumps).
Enabling the Modem (G20 RTx)
After sending the program to the unit, users need to enter
TRANSMIT MODE to enable the FTP transfer and SMS alarm.
Please check the”OdaStat NX” section for more information.
NOTE: The unit does not automatically activate the modem
when getting its configuration.
Calibration
NULL
1. When users notice the reading is not 0.0ppm, in an
atmosphere where no H₂S gas is present but has a
slight fluctuation, it will be necessary to perform a
NULL Calibration.
2. Ensure there is no H₂S present surrounding the unit
(i.e., testing bench, oce room).
3. Stop logging if you see the LOGGING indicator flashing.
4. Place the magnetic tip at the “Menu” marking on the yellow
label, hold it there until “NULL” appears, then remove the
magnetic end.
5. You will see the “NULL IN Prog” on display; wait for one
minute before seeing “SWIPE Y”.
6. Swipe the magnetic end to the Y side to confirm the
completion of NULL. Followed by “DONE” on display.
7. The NULL process is complete.
IMPORTANT NOTE: There is a 5-seconds window after
“SWIPE Y” appears. If you do not confirm “Y” using the
magnetic tip, in time, before “SWIPE Y” disappears, the NULL
Calibration will be cancelled and it will be necessary to repeat
the process.
SPAN
1. If the T90 test is beyond the standard 30 seconds or the
reading is incorrect, consider doing a SPAN Calibration.
2. Due to a risk factor concerning H₂S, please send the unit
back to your supplier or use the service of a known gas
calibration company.
3. Set and write the unit configuration calibration gas value
per the target gas (i.e., 99.4 ppm) via the OdaStat-NX
(see Figure 51).
Figure 51. Calibration Gas Value
4. Ensure to perform the H₂S gas calibration properly with
proper equipment (i.e., fume cupboard, control valve,
flexible tubing).
5. Prepare a calibration gas bottle or if you have it as part of
the fume cupboard.
6. Have a calibration fitting connected to the clear tubing and
place it underneath the unit.
7. Have the control valve connected to the gas bottle and
the other end of the tubing connected to the valve
(see Figure 52).
Figure 52. Calibration Setting on Standard Gas
8. Open the valve at 250–500 ml/minute; there are two
methods of waiting for the gas to reach stability.
9. You can read the measurement from the display
(INST value).
10. When you notice the gas reading no longer increase
(usually after 2 minutes), place the magnetic tip at the
“Menu” marking on the yellow label, hold it there until
“SPAN” appears, then remove the magnetic end.
11. You will see the “SPANNIN Prog” message on display; wait
for 1 minute before the screen shows “SWIPE Y.”
12. Swipe the magnetic end to the Y side to confirm the
completion of SPAN. Followed by “DONE” on display.
13. You may see an INST reading which is dierent/ far from
the target gas; that is OK. Keep the gas flow and start
the logging to check the reading after SPAN. The reading
would be near the target gas.
14. Close the valve and disconnect the fitting. You will see
DUE Cal on the status screen to become 255. This means
another calibration is due in the next 255 days.
IMPORTANT NOTE: There is a 5-seconds window before this
Y disappears, and if it happens, the unit cancels the SPAN.
You will need to repeat the process.
T90 Test
1. You may choose to run the T90 test after the SPAN
process to check the sensor response time to the gas.
2. To observe T90, you can do directly with the Odalog G20
unit or you may use a Honeywell evaluation kit.
3. When doing the T90 test directly, set the measurement
interval in Odalog G20 configuration to 5 seconds.
4. Open the valve and let the gas flow for a minute, download
the data and observe the chart using the OdaStat-NX.
5. When using Honeywell evaluation kit, fit the sensor into
the gas chamber and connect to a PC, enable the sensor
reading at 1 second interval which will be plotted into
the chart.
IMPORTANT NOTE: Please consider replacing the sensor if
the DUE EOL value at 30 or below, as it means you can only
use the sensor for another month.
Odalog Portable Gas Loggers
Unit Care | 3332 | OdaStat NX
Odalog Portable Gas Loggers

Troubleshooting
The G20 unit shows an error message on the display when it detects an error during a particular process or a fault on
specific components. The following Table 6 shows all possible errors on display; each event has information about the
possible causes and solutions.
Some error messages occur when accessing the unit STATUS screen; others can happen in a flash; or during
calibration processes.
Table 6. Error Descriptions and Solutions
Error Display Cause/ Description Solution
MEMORY 0 GB
• Memory is low
• The SD card is not properly mounted/being
removed while the unit is ON
• SD card not detected because low battery
• Delete the old data
• Perform RESET (from the menu) on the unit
• or contact the manufacturer/ representative
• Replace the battery
Replc Bat Battery reaches critical level Replace the battery
Due EOL 0 • The sensor reaches the end of life
• The date/ time is not being set yet
• Replace the sensor
• Set the date/ time in OdaStat-NX
Due CAL 0 • The sensor need recalibration
• The date/ time is not being set yet
• Calibrate the sensor
• Set the date/ time in OdaStat-NX
Failed Cannot perform NULL/ SPAN Repeat the process
FTPOPNErr Failed to establish FTP connection Check the modem signal, server credential, and
security setting (FTP/ FTPS)
FTPREDErr Failed to read from FTP server Check the modem signal and possible previous
transfer corruption
FTPWRTErr Failed to write to FTP server Check the FTP server setting against writing action
InvalSens Invalid sensor, specific code is not detected Check the sensor contact point and ensure to use
the digital sensor from ThermoFisher
ModemErr Failed to communicate with the modem Hard reset the unit or reinstall the firmware
SensorBad1 The sensor is too dry Bring the unit to a chamber with high humidity
SensorBad2 The sensor is too wet Bring the unit to a drying chamber for a couple
of days
SensorBad3 The sensor calibration is due Calibrate the sensor
SensorBad4 The sensor reaches the end of life, loses contact, or
short-circuits Clean the sensor or replace the sensor
SensorBad5 Fault on sensor electrodes, temperature out
of range Replace the sensor
SensorBad6 The sensor bump test is due Calibrate the sensor
SensorBad7 The sensor user factor setting is incorrect Incorrect firmware version, contact the nearest
distributor/ manufacturer
SensorBad8 Fault on sensor’s memory Hard reset the unit, if the problem persists replace
the sensor
SIGBAD Low signal, unable to open data connection Check the APN setting, move the antenna
SIM Err Cannot recognize the SIM card Use a different provider SIM card
Sleep Low power, sensor forced to sleep1Replace the battery.
SMSErr Failed to send SMS Check the modem signal2
1. Cannot read sensor which will cause disable logging
2. Change the antenna location if possible
Other Possible events
There is a possibility users may see a few events not shown as an error in the display, but it prevents the units from
running normally. They are described as follows (Table 7):
Table 7. Other events
Category Description Solution
Battery Operating time is less than 6 months • Observe the sampling rate
• Contact the manufacturer or representative
Display Missing a segment in the display Contact the manufacturer or representative
Menu Freeze, no response to a magnet swap Contact the manufacturer or representative
Menu Won’t trigger an action (Logging,
Communication)
• The cause is because undetected SD card, lost
communication with the sensor, or sensor DUE
becomes 0
• Check the STATUS for remaining memory, DUE
EOL and DUE CAL
• Perform RESET (from the menu) on the unit or
contact the manufacturer or representative
Logging Failed to download logged data
• The cause is because the logging suddenly
stops, most likely because the interval is
too fast (<30 seconds) or an issue with the
SD card
• Change the logging interval to 30 seconds
or more
• Perform RESET (from the menu) on the unit or
contact the manufacturer or representative
Logging Incorrect value, reading fluctuation or less accurate
reading for H₂S
• Recalibrate the sensor
• Replace the sensor
• Contact the manufacturer or representative
Logging Data time tag is incorrect • Possible firmware bug
• Contact the manufacturer or representative
Communication • Bluetooth (BLE) mode won’t start
• Dicult to connect
• Check the battery voltage, any reading below
3.2 V will disable Bluetooth
• Move to another area with less
Wi-Fi interference
Communication USB (UART) mode won’t start Check the battery voltage, any reading below 3.1 V
will disable UART
Communication The unit crashes on using 2-wire RS485
for MODBUS communication Use 4-wire RS485 configuration
34 | Unit Care
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Unit Care | 35

For Research Use Only. Not for use in diagnostic procedures. © 2023 Thermo Fisher Scientific Inc. All rights reserved.
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