Geotech G110 User manual

G100RANGE
G100, G110, AND G150 OPERATING MANUAL

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Table of Contents
Manual Guidelines...................................................................................................................................5
Safety Related Information..................................................................................................................5
Hyperlinks............................................................................................................................................5
Notes ...................................................................................................................................................5
Introduction ............................................................................................................................................6
The G100 Analyser Range....................................................................................................................6
Applications .........................................................................................................................................7
Instrument Components - Standard Product.......................................................................................7
G100 Range Optional Products and Accessories.....................................................................................8
Optional Products................................................................................................................................8
Analyser Data Manager (Optional) ......................................................................................................8
Event Log .............................................................................................................................................8
Temperature Probe Reading (Optional)...............................................................................................8
Humidity Probe Reading (Optional).....................................................................................................8
Connection of the Humidity Sensor.................................................................................................9
Oxygen Reading (Optional) ..................................................................................................................9
Instrument Accessory Products .........................................................................................................10
Instrument Features..............................................................................................................................11
Physical Characteristics of the Instrument Panel...............................................................................11
Panel Key Functions...........................................................................................................................12
Instrument Connection Points...........................................................................................................13
General Operational Instructions ..........................................................................................................14
Switching the Instrument On.............................................................................................................14
Switching the Instrument Off.............................................................................................................14
Instrument Main Read Screen ...........................................................................................................14
Soft Keys.........................................................................................................................................14
Instrument Status Icons.....................................................................................................................15
Entering Data.....................................................................................................................................15
Changing Between Parameters..........................................................................................................16
Memory .............................................................................................................................................16
Storage...............................................................................................................................................16
Main Menu ........................................................................................................................................16
Information ....................................................................................................................................16

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Utilities...........................................................................................................................................17
Calibration......................................................................................................................................23
View Data.......................................................................................................................................23
Diagnostics.....................................................................................................................................24
Warning and Error Codes...................................................................................................................24
Battery/Charging................................................................................................................................24
Taking Readings.....................................................................................................................................26
Preliminary Checks - Best Practice.....................................................................................................26
Gas Measurement Process –Best Practice........................................................................................27
Alternative Reading Methods ............................................................................................................28
Logged Reading..............................................................................................................................28
Peak Reading..................................................................................................................................28
Hold Reading..................................................................................................................................29
Calibration.............................................................................................................................................30
User Calibration .................................................................................................................................30
Calibration Gases ...............................................................................................................................30
Calibration Set-up..............................................................................................................................30
Calibration Equipment.......................................................................................................................31
Calibration Method............................................................................................................................32
Reset Factory Settings....................................................................................................................32
Zero CO2Channel...........................................................................................................................32
Span CO2Channel ..........................................................................................................................33
Zero O2Channel .............................................................................................................................33
Span O2Channel.............................................................................................................................33
Last Field Calibration..........................................................................................................................34
Calibration Record .............................................................................................................................34
Problem Solving.....................................................................................................................................35
Warnings and Errors ..........................................................................................................................35
Under and Over Range Codes ........................................................................................................35
Flow Fail Warning...........................................................................................................................35
Self-test Warning Messages...........................................................................................................36
User Calibration Trouble Shooting.....................................................................................................37
User Calibration Explained.............................................................................................................37
Cross-Gas Effects ...............................................................................................................................39

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Error Due to CO2Solubility in Water..................................................................................................39
Hardware Reset .................................................................................................................................39
Service...................................................................................................................................................40
User Serviceable Parts .......................................................................................................................40
Cleaning .............................................................................................................................................40
Warranty Policy .....................................................................................................................................41
Event Log...............................................................................................................................................43
WEEE Compliance .................................................................................................................................44
EU Declaration of Conformity................................................................................................................45
Glossary of Terms..................................................................................................................................46

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MANUAL GUIDELINES
Safety Related Information
Information in this manual that may affect the safety of users and others will be in a box
identical to this one.
Failure to follow this information may result in physical injury which in some cases could be fatal.
Hyperlinks
Hyperlinks to other sections of this manual, websites or email addresses are in the following format:
www.geotechuk.com
Notes
Important/useful information and instructions are shown clearly throughout the manual in a note
format.
For example:
Note: For further information please contact Technical Support at QED on [phone] or
email [e-mail].

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INTRODUCTION
This manual explains how to use the instrument model types listed below:
G100 CO2 0-20%
G110 CO2 0-100%
G150 CO2 0-10,000ppm
Note: The instrument is a sensitive piece of scientific equipment, and should be treated as such.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
The G100 range has been developed to incorporate the latest technology and specification
requirements, which provide the user with a fast, simple-to-use and accurate analyser. Each model
has been specifically designed to meet specific application requirements. Apparatus intended for use
in residential, commercial, pharmaceutical and light industrial environments.
The G100 Analyser Range
The analyser has the following features:
CO20-20% - G100
CO20-100% - G110
CO20-10,000ppm –G150
Options for:
oO20-100%
oDual temperature probes 0-50oC
oData storage and download
oHumidity sensor 0-100%
Improved accuracy on CO2readings
Quick verification of CO2
Time saving with dual temperature probes
Large data storage and user friendly software and download
Easy-to-read, large well lit display
Built-in gas moisture removal

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Applications
IVF/Medical
Research
Laboratories
IAQ
Brewing
Atmosphere Control
Incubators
Gas mixing
Instrument Components - Standard Product
Reference:
A)
Analyser
D)
Mains Battery Charger Adaptors: (EU, US, AU)
B)
Operating manual
E)
Sample tube kit
C)
Mains battery charger

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G100 RANGE OPTIONAL PRODUCTS AND ACCESSORIES
Optional Products
The G100 analyser range has a number of optional products for purchase which enhance the usability
and enable further analysis of data and reading information.
Note: For more information on the features listed in this section please contact Sales at QED on
[phone] or email [e-mail].
Analyser Data Manager (Optional)
Analyser Data Manager enables the user to maximise the operation of the incubator analyser.
Instrument readings and event log data may be downloaded to a PC for further analysis and exported
to other applications such as MS Excel. It enables direct communication with the unit, features a
simple download facility and is fully compatible with the latest Microsoft operating systems.
Event Log
The G100 instruments incorporate the facility to log significant events via the ‘Event Log’. This can be
used as an aid to monitoring the use of the instrument. It can also be used as a diagnostic tool if there
is a problem with the instrument.
The event log can only be viewed via the optional Analyser Data Manager software. It cannot be
viewed on the analyser screen. Applicable events are stored in the event log automatically. No user
intervention is required.
The event log can hold approximately 270 events. If the log becomes full then it begins to over-write
the older events. This can be identified by the index field which starts from event number 1. The log
is cleared when the instrument is reset.
Note: Please refer to section Event Log of this operating manual for further information.
Temperature Probe Reading (Optional)
The G100 range of instruments has the facility to read and display two temperature readings via
optional temperature probes. When a temperature probe is fitted to one of the two temperature
ports on the top of the instrument, the display will automatically show the current reading and a
temperature probe icon will be displayed.
The display can also be changed to show a T1–T2calculation by pressing the appropriate soft-key.
The current mode of operation can be identified by normal or inverse status of the soft-key, where
inverse indicates that the option is active.
Note: The T1–T2result is not stored as part of the reading.
The operator can also choose to display the reading in either Centigrade or Fahrenheit using the
temperature option accessed from the ‘Settings’ menu.
Humidity Probe Reading (Optional)
The instrument has the optional facility to use a humidity probe (specified at the time of
manufacture). This allows the instrument to read and display humidity readings from an optional
probe.
When a humidity probe is fitted, the display will change automatically to show the current reading
and a humidity probe icon will be displayed. The ‘Scroll’ keys on the instrument panel are used to

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switch between the reading screens.
The humidity kit comprises of:
Humidity lead
Humidity sensor
Connection of the Humidity Sensor
Plug the humidity sensor onto the mating connector of the transmitter or connection cable. Make
sure that the catches are aligned correctly. Tighten the knurled nut by hand.
Note: The humidity sensor can take 30 minutes to stabilise and special handling is required for
optimum performance and stability. Please refer to the instruction leaflet included with the
humidity sensor packaging for the Humidity Standards.
Oxygen Reading (Optional)
The instrument has the optional facility to use an internal oxygen cell (specified at the time of
manufacture). This allows the instrument to read and display oxygen readings along with CO2.
Note: Oxygen sensor stability; as the sensor is a partial pressure sensor its output will be affected
by changes in relative humidity. Although the percentage of O2 in the air is relatively constant,
the relative humidity in air is variable. A unit calibrated with dry air could cause the readout to
read low by up to 0.5% by volume.

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Instrument Accessory Products
Optional accessory and replacement parts may be purchased for the G100 from QED direct. Please
refer to the website www.geotechuk.com for further details on pricing and how to order.
Ref
Description
Part Number
A
USB Lead
USBLEAD2
B
Spare Sample Filters (pack of 5)
068296/S
C
Sample Tube Kit
G1.6
D
Hard Carry Case
050227
E
Temperature Probe 100mm Tip
G1.3
F
Temperature Probe 5mm Tip
G1.2
G
Humidity Lead and Sensor
G1.8
H
Moisture Trap (pack of 2)
G1.12
I
Spare Calibration Gas 5% CO2
CDA7.6
J
Mains Charger including Worldwide Adaptors
073024
K
Soft Carry Case
G1.11
L
Soda Lime Filter Kit
G1.10
M
Analyser Data Manager Software
G1.4
N
Regulator and Tubing for Calibration Gas
G1.1

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INSTRUMENT FEATURES
Physical Characteristics of the Instrument Panel
Front View: Reference:
Back View: Reference:
A
Main Read Screen
B
Soft-Keys
C
On/Off Key
D
Pump Key
E
Key 4 –Scroll Left
F
Key 8 –Scroll Down
G
Menu Key
H
Enter Key
I
Key 2 –Scroll Up
J
Key 6 –Scroll Right
K
Moisture Removal Tube
L
Serial Number
M
Instrument Stand
A
B
C
D
E
F
G
H
I
J

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Panel Key Functions
Note: Do NOT attempt to remove the cover off the back of the analyser which houses the
moisture removal tube.
Note: Do NOT cover the moisture removal tube with your hand when holding the analyser to take
readings.
Key
Description
Function
A
Main Read Screen
Start and end screen when using the instrument.
B
Soft Keys
The function of the three ‘soft-keys’ on the front of the
instrument panel are determined by menu options
taken. Functions vary from screen to screen.
C
On/Off Key
Press the ‘On/Off’ key briefly to switch the instrument
on and off.
D
Pump Key
Press the ‘Pump’ key to start or stop the pump.
E
Scroll Left Key
Also ‘Key 4’. Enables the operator to scroll left to
display more information.
F
Scroll Down Key
Also ‘Key 8’. Enables the operator to scroll down to
display more information.
G
Menu Key
Press the ‘Menu’ key to go to the ‘Main’ menu. Enables
the operator to pre-set values and settings. Select
options from the ‘Main’ menu to also view data and
readings stored or held.
H
Enter Key
The ‘Enter’ key accepts/confirms choices made by the
operator to various functions and operations. Also,
required to confirm numeric data entry.
I
Scroll Up Key
Also ‘Key 2’. Press scroll up to view further information
on the instrument read screen.
J
Scroll Right Key
Also ‘Key 6’. Press scroll right to view further
information on the instrument read screen.
K
Moisture Removal Tube
Removes the moisture from the sample gas.
L
Serial Number
Unique Identification for the instrument. Verification of
the serial number will be required if Technical Support
assistance is needed.
M
Instrument Stand
Instrument stand.

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Instrument Connection Points
Top View:
Side View:
Key
Description
Function
A
Temperature 1
Temperature 1 connector measures temperature –
incubator and ambient temperatures.
B
Temperature 2
Temperature 2 connector measures temperature –
incubator and ambient temperatures
C
Humidity Probe (Optional)
Humidity probe attachment point
D
Gas Outlet
Gas outlet port used to exhaust the gas
E
Gas Inlet
Gas inlet point used to attach the sample tube and filter
in order to take the gas reading
F
USB Port
Used to connect the analyser to a PC via a USB cable to
download data
G
Charger Port
Used to attach the main charger to the analyser for
charging
Note: Temperature connectors are fitted with black plugs to prevent dust ingress, remove before
use. Grip connector cap and pull upwards to release. Refit when not in use.
Note: Depending on the configuration purchased, certain connectors may not be present.
5V ±0.5V(max 1000mA)
+- 5V ±0.5V(max 1000mA) +- +-

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GENERAL OPERATIONAL INSTRUCTIONS
Note: Fully charge the unit before use when the instrument is first received or if the instrument
has been in storage for six months or more.
Switching the Instrument On
To switch on the instrument, press the ‘On/Off’ key briefly. There will be a short beep and a
slight pause followed by the Geotech logo.
The power on self-test will then commence with a short pre-determined self-test sequence.
Assuming there are no warnings to display the instrument will continue to the ‘Main Read
Screen’.
Switching the Instrument Off
Purge with fresh air. Run the pump for approximately 30 seconds or until the readings have
returned to normal levels.
Note: Before the instrument is switched off a clean air purge should be performed. This ensures
that the instrument is free from gas and ready for the next measurement. This final purge is
especially important for the oxygen sensor as it may degrade if stored when contaminated with
gas.
To switch off the instrument, press the ‘On/Off’ key briefly.
Note: If the ‘Auto Off’ utilities setting is set to ‘Yes’, the analyser will switch off automatically
after 10 minutes if not in use.
Instrument Main Read Screen
After the analyser has been switched on and the warm-up self-tests completed the analyser will
display the ‘Main Read Screen’.
G150 Screen Shown:
Soft Keys
Peak - Enables the operator to display the peak reading.
Store - Enables the operator to store the displayed reading for viewing/download later.
Hold - Enables the operator to hold the current reading being taken.
Note: The pump is turned off when a reading is stored.
Battery
Power
Indicator
Pump (On)
Indicator
Symbol
Alarm Set
Temperature
Probe
Connected
Indicator

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Instrument Status Icons
The following icons may be displayed on the instrument read screens:
Icon
Description
Battery charge state
(flashing)
< 1 hour remaining
(flashing)
Battery charging
Charged
Pump running
(flashing)
Pump stalled (Backlight turns red)
Alarm set
(flashing)
Alarm active (Backlight turns red)
USB connected to PC (flickers when transferring data)
Logging mode active (flashes when memory nearly full)
Temperature probe(s) connected
Humidity probe connected
(flashing)
Service due (every 12 months)
Service overdue
Fault/repair
Waiting
Note: A red backlight is displayed if the pump is stalled or the alarm is activated. For further
information, please refer to the Alarms or Flow Fail sections.
Entering Data
During normal operation the user may be prompted to enter data or information via the keypad, i.e.
entering an ID code or setting an alarm level.
When entering data into the instrument all fields are fixed format and are populated from the right.
For example, to enter a new time 09:25:00 the user would type in 092500 using the numeric keypad
in the following sequence:-
* : : 0
* : :09
* : 0:92
* :09:25
* 0:92:50
* 09:25:00
Press the ‘Enter’ key to confirm/accept data keyed.
Any mistakes can be corrected using the soft-key ‘Delete’ which will delete the last character typed.
Alternatively, the sequence can be re-typed before the ‘Enter’ key is pressed and the existing
numbers will be pushed off the screen.
Note: The instrument will not allow invalid data to be entered; this should be deleted and re-
entered.

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Changing Between Parameters
By default, the instrument displays the ‘Main Read Screen’ (for gas measurement). This shows the CO2
reading along with the optional O2reading. The instrument will return to this screen after power on or
when returning from the menus. Key 2 ‘Arrow up’ can be used to switch to another measurement
screen, i.e. temperature or humidity. Continue to press the ‘Scroll’ key to return to the ‘Main Read
Screen’.
Memory
The memory should not be used as a permanent storage medium and any important data should be
transferred to a more permanent storage medium as soon as possible. The instrument should not be
stored for prolonged periods with valuable data in its memory.
Storage
When not in use the instrument should be kept in a clean, dry and warm environment, such as an
office. It should be stored flat with the stand folded away which helps prolong the life of the O2cell.
Note: Fully charge the instrument before use if instrument has been stored for six months or
more.
Main Menu
The ‘Main Menu’ enables the operator to select options to set up specific parameters and perform
operational tasks prior to sample readings being taken or to view data/information stored in the
instrument.
Press the ‘Menu’ key on the front of the instrument panel and the following screen is displayed:
Screen 1 - Main menu
Press the soft-key ‘Exit’ to exit the ‘Main’ menu.
Information
The ‘Information’ option enables the operator to display information such as instrument type, serial
number, current software version, service due date and the dates of the last factory and user
calibrations.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 1’ to display general information about the instrument.

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Screen 2 - Information
Utilities
The ‘Utilities’ option enables the operator to configure instrument settings prior to taking readings.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 2’ to display the ‘Utilities’ menu and the following screen is displayed:
Screen 3 - Utilities menu
Time & Date
The ‘Time and Date’ option enables the operator to check or set the instrument’s internal clock. The
current time/date are appended to every stored reading.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 2’ to display the ‘Utilities’ menu.
Press ‘Key 1 – Time & Date’ and the ‘Set Time & Date’ menu is displayed:
Screen 4 - Set time & date
Press ‘Key 1’ to change the time or press ‘Key 2’ to change the date. Type the time or date
using the numeric keypad followed by the ‘Enter’ key. The instrument will not allow invalid
times or dates to be entered.
Note: The clock will need to be manually adjusted to cope with daylight saving changes or

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changes when crossing time zones.
Contrast
The ‘Contrast’ option enables the operator to adjust the instrument screen contrast to compensate
for changes in ambient temperature. The default setting is 0.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 2’ to display the ‘Utilities’ menu.
Press ‘Key 2’ to select the instrument panel contrast settings and the following screen is
displayed:
Screen 5 - Adjust contrast
Press ‘Key 3 - Scroll Left’ and ‘Key 6 - Scroll Right’ to adjust the value displayed.
Press the soft-key ‘Accept’ or ‘Reject’ accordingly to accept or reject the changes.
Note: The manually set contrast setting is retained when the instrument is switched off.
Alarms
The G100 range of instruments has the facility to set rising or falling alarms for the two main gas
channels, CO2 and O2 (if selected as an option). The alarms for each channel can be enabled or
disabled independently via the ‘Alarms’ menu option.
Once enabled these alarms become active in the ‘Main Read Screen’; this is indicated by a bell icon.
If an alarm is triggered the screen turns red and a flashing bell icon is displayed. The beeper is
sounded until the gas level has recovered beyond the trigger point.
Rising alarms are triggered when the gas level exceeds the maximum value entered by the
user.
Falling alarms are triggered when the gas level falls below the minimum value entered by the
user.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 2’ to display the ‘Utilities’ menu.
Press ‘Key 3’ to select alarm settings and the following screen is displayed:

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Screen 6 - Current alarms
Press ‘Key 1’ to maintain CO2 alarm and ‘Key 2’ to maintain O2 alarm.
Select from the following:
1 –Enabled/Disabled: Toggle between disabled and enabled alarm status.
2 –Max: Sets the upper limit alarm setting.
3 –Min: Sets the minimum alarm setting. The default is 0.
Select the option to modify followed by the soft-key ‘Accept’ or ‘Reject’.
Settings
The ‘Settings’ option enables the operator to maintain information with regards to taking samples and
readings.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 2’ to display the ‘Utilities’ menu.
Press ‘Key 4’ to select settings and the following screen is displayed:
Screen 7 - Settings
The following instrument settings may be maintained:
1 –Prompt ID: Press ‘Key 1’ to prompt for ID code for each sample reading, answer Yes or No
accordingly.
2 –Temperature: Press ‘Key 2’ to enter the default unit temperature, choosing from OC or OF.
3 –Date: Press ‘Key 3’ to switch the date format between dd/mm/yy and mm/dd/yy formats.
4 –Auto Off: Press ‘Key 4’ to auto switch off the instrument when not in use. Toggle between
‘Yes’or ‘No’. If set to Yes, the instrument will switch off after 10 minutes if not in use.

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Flow Fail
The ‘Flow Fail’ option enables the operator to adjust the instrument flow fail detection point should it
fail in normal operation with a clean filter.
The instrument’s internal pump can be stalled when pulling against a vacuum or through a blocked
filter. This is indicated by a flashing pump icon and a red screen; to prevent damage to the pump,
the pump will switch off after a few seconds.
Press the ‘Pump’ key again to remove the flashing pump icon.
Note: Dirty or discoloured filters should be changed before use. Filters that have drawn in water
should be changed immediately to prevent damage to the instrument.
From the ‘Main Read Screen’ press the ‘Menu’ key on the instrument panel.
Press ‘Key 2’ to display the ‘Utilities’ menu.
Press ‘Key’ 5 to select flow fail and the following screen is displayed:
Screen 8 - Adjust flow fail
Use the ‘Scroll’ keys to adjust the value displayed. The larger the value, the less sensitive the
flow fail detection is.
Press soft-key ‘Accept’ or ‘Reject’ accordingly.