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
18 | Operation
Odalog Portable Gas Loggers Odalog Portable Gas Loggers
Operation | 19