ion science GasCheck G 1 User manual

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GasCheck G
Instrument User Manual V2.4
Unrivalled Gas Detection. ionscience.com

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GasCheck G Instrument User Manual V2.4
Unrivalled Gas Detection. Page 3 of 26 ionscience.com
EU Declaration of conformity
Manufacturer: Ion Science Ltd, The Hive, Butts Lane, Fowlmere, Cambridge, England. SG8 7SL
Product: GasCheck G 1, 2 and 3 (Graphical)
Product description: a handheld micro thermal conductivity sensor used to detect gas leaks. This instrument
has been designed specifically for search and location of non-flammable gases such as helium and CFC’s.
Directives: 2014/30/EU Electrical Equipment –Electromagnetic Compatibility (EMC)
Standards: BS EN 61010-1:2010 Safety requirements for electrical equipment for measurement,
Control and laboratory use –Part 1: General requirements
BS EN ISO 9001:2015 Quality management systems –Requirements
BS EN 61326-1:2013 Electrical Equipment for measurement, control and laboratory use
EMC Requirements (Class B and General Immunity)
Ion Science Ltd has sole responsibility, on the date this product accompanied by this declaration is placed on the
market, the product conforms to all technical and regulatory requirements of the above listed directives.
Name: Graham Davies Position: Quality Manager
Signature: Date: 9th April 2018
Issued by Ion Science Ltd of the above address on the 09/04/2018

GasCheck G Instrument User Manual V2.4
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Contents
EU Declaration of conformity .................................................................................................................................................. 3
Statements............................................................................................................................................................................. 5
Safety.....................................................................................................................................................................................................5
Quality Assurance..................................................................................................................................................................................5
Responsibility of use..............................................................................................................................................................................5
Disposal .................................................................................................................................................................................................5
Calibration Facility.................................................................................................................................................................................5
Legal Notice ...........................................................................................................................................................................................5
Instrument description............................................................................................................................................................ 6
Packing list ............................................................................................................................................................................. 7
How GasCheck G works........................................................................................................................................................... 8
Thermal Conductivity ............................................................................................................................................................................8
Replacing batteries ................................................................................................................................................................. 9
Getting started ..................................................................................................................................................................... 10
The Keypad..........................................................................................................................................................................................10
Instrument main menu ......................................................................................................................................................... 11
Running screen ..................................................................................................................................................................... 12
Gas selection .......................................................................................................................................................................................12
Sensitivity ............................................................................................................................................................................................12
Battery status ......................................................................................................................................................................................12
Backlight ..............................................................................................................................................................................................12
Gas measurement ...............................................................................................................................................................................12
Sound indication..................................................................................................................................................................................12
Bar graph .............................................................................................................................................................................................12
Peak hold.............................................................................................................................................................................................12
Functions ............................................................................................................................................................................. 13
Contrast...............................................................................................................................................................................................13
Backlight ..............................................................................................................................................................................................13
Sound...................................................................................................................................................................................................13
Peak hold.............................................................................................................................................................................................13
Calibration ...........................................................................................................................................................................................13
Battery selection .................................................................................................................................................................................14
View Data ............................................................................................................................................................................................14
Units ....................................................................................................................................................................................................14
Display .................................................................................................................................................................................................14
Gas selection .......................................................................................................................................................................................15
Upgrade...............................................................................................................................................................................................15
Using GasCheck G ................................................................................................................................................................. 17
Probe options....................................................................................................................................................................... 18
Detecting leaks..................................................................................................................................................................... 19
Over view.............................................................................................................................................................................................19
Calibration ........................................................................................................................................................................... 20
Over view.............................................................................................................................................................................................20
Selecting Factory or Custom Calibration.............................................................................................................................................20
Calibration procedure using 'ppm' units.............................................................................................................................................20
Calibration procedure using 'cc/sec' units ..........................................................................................................................................21
Instrument specifications ...................................................................................................................................................... 22
40 Hours (20 hours when using the backlight) ........................................................................................................................ 22
Replacing parts..................................................................................................................................................................... 22
Instrument warranty and service........................................................................................................................................... 24
Warranty .............................................................................................................................................................................................24
Service .................................................................................................................................................................................................24
Contact details.....................................................................................................................................................................................25
Manual log ........................................................................................................................................................................... 26

GasCheck G Instrument User Manual V2.4
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Statements
Safety
Please read this manual in full before using the GasCheck G instrument. Ion Science Ltd takes no responsibility
for damage, injury or death resulting from misuse, misunderstanding or negligence while using this gas detector.
Please contact Ion Science Limited via the address below for clarification on any aspect of this manual that is not
understood or for additional information required.
This instrument should only be used by qualified or competent persons with suitable knowledge of the hazards
relating to the gases contained within equipment or in the local environment.
Quality Assurance
GasCheck G instruments are manufactured by Ion Science Limited within an ISO 9001:2015 compliant quality
system, which ensures that the equipment supplied to our customers has been designed and assembled
reproducibly, and from traceable components.
Responsibility of use
Many gases are hazardous and can cause explosion, poisoning and corrosion resulting in damage to property and
life. It is the responsibility of the person using this instrument to ensure it is being used in accordance with this
manual and that the instrument is functioning correctly before use.
The GasCheck G can detect a large range of gases but some gases are more difficult to detect.
It is the responsibility of the user to ensure the GasCheck G instrument has the sensitivity to detect the required
gas before reaching potentially dangerous levels.
Inadequate performance of the gas detection equipment described in this manual may not necessarily be self-evident
and consequently equipment must be regularly inspected and maintained. Ion Science recommends that personnel
responsible for equipment use institute a regime of regular checks to ensure it performs within calibration limits, and
that a record be maintained which logs calibration check data. The equipment should be used in accordance with this
manual, and in compliance with local safety standards.
Disposal
Disposal of GasCheck G, its components and any used batteries shall be in accordance with local and national
safety and environmental requirements. This includes the European WEEE (Waste Electrical and Electronic
Equipment) directive. Ion Science Ltd offers a 'take-back' service. Please contact Ion Science Ltd for more
information.
Calibration Facility
Ion Science Ltd offers a calibration service including the issue of a traceable certificate valid for 12 months. A
GasCheck G Calibration Kit offers a means of checking and calibrating the instruments against a known reference,
however Ion Science Ltd strongly recommend the instrument is returned to an approved service centre on an
annual basis for general maintenance and calibration.
Legal Notice
Whilst every attempt is made to ensure the accuracy of the information contained in this manual, Ion Science accepts
no liability for errors or omissions, or any consequences deriving from the use of information contained herein. It is
provided "as is" and without any representation, term, condition or warranty of any kind, either express or implied. To
the extent permitted by law, Ion Science shall not be liable to any person or entity for any loss or damage which may
arise from the use of this manual. We reserve the right at any time and without any notice to remove, amend or vary
any of the content which appears herein.

GasCheck G Instrument User Manual V2.4
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Instrument description
The GasCheck G is a range of portable hand held gas detector instruments predominantly used for detecting gas leaks
and can detect almost all gases to varying degrees. Being a hand held instrument it is powered by standard AA size
batteries and will accept both Alkaline and Nickel Metal Hydride (rechargeable) types.
The GasCheck G uses thermal conductivity as it's means of detecting gas which offers a robust sensor technology that
requires practically no maintenance beyond annual servicing.
All GasCheck G models have an easy to use graphical interface with an intuitive keypad allowing simple function
selection and adjustment.
The GasCheck G is a range of instruments that can be upgraded to add features without the need to be returned to
the supplier and without having to modify the internal firmware.
GasCheck G has an LCD display, LED indicator and audible sounder that indicates the detected signal.
Common applications where The GasCheck G is already used include:
* Quality assurance - Testing seal integrity after product manufacture
* Laboratory applications - Detection of leaks from mass spectrometers and chromatograph
equipment
* Industrial - Leaks from gas cylinders, pipe work and process equipment
* Medical - Testing of membrane materials and sealing of glove boxes
* Pneumatic - Valve seal testing
The GasCheck G is calibrated against a 5 E-4 cc/s Helium leak to allow volumetric readings and also a 5000ppm Helium
to allow measurement of concentrations.
Selectable units:
cc/sec Cubic Centimetres per Second offers a reading that indicates the volume of gas escaping into
atmosphere from a single point. ie. leakage from a hole in a gas filled vessel or pipe.
ppm Parts Per Million is a concentration reading, GasCheck G will display the concentration being
detected however it is more difficult to gauge the quantity of leakage.
mg/m3Milligrams per meter cubed is also a unit that measures concentration. (See ppm above)
g/yr Grams per Year is an alternative measure of leak rate.
The GasCheck G range is NOT intrinsically safe so should not be using in a potentially
explosive environment.
Ambient air pressure, heat and humidity can also affect readings.
The GasCheck G range is NOT 'Gas Specific' i.e. It can NOT differentiate between gases.

GasCheck G Instrument User Manual V2.4
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Packing list
Please remove all packing material and then check the content of the carry case against the list below before use. Should
the instrument or any accessory appear damaged or missing then contact the instrument supplier for advice before use.
Item
Qty
Description
Check
1
1
GasCheck G instrument with short probe and nozzle fitted
2
1
Long probe
3
1
Box spanner used to change probes
4
1
Spare battery clip
5
1
Quick Start Guide
6
1
Calibration certificate







GasCheck G Instrument User Manual V2.4
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How GasCheck G works
Thermal Conductivity
All gases conduct heat but by varying amounts, if an object is heated and then the source of heat is removed, the
object will eventually cool down to match ambient air temperature. This action occurs because the ambient air
surrounding the object carries the excess heat into the surrounding atmosphere.
This principal is also the same for objects that are cooler than the surrounding ambient air.
Dissipation of heat into an air atmosphere is known and is a predictable rate however, if the ambient air is replaced
with an alternative gas like Helium the rate at which an object cools down changes.
If the object mentioned above had it's environment replaced with pure Helium it would cool down to the environment
temperature about 6 times faster.
The GasCheck G contains a heated thermistor bead that transmits heat to a block of material that remains at a
constant temperature. As air passes through the detector chamber a constant amount of heat passes from the bead
to the block. Gases that are different to air will affect the rate at which heat transmits from the bead to the block,
these rates of change are measured and displayed as leak rates.
The diagram below shows the basic functionality of the GasCheck G's Thermal Conductivity sensor.
A fan draws a small flow of gas through the probe and into the sensing chamber. The thermistor bead heats up when
electrical power is applied. As air passes through the cell a constant level of heat is transmitted to a Temperature
Stable block through the air, this rate of heat transmission is used to 'Zero' the instrument.
When gases with different thermal qualities pass through the chamber the amount of heat being transmitted to the
Temperature Stable block changes. These changes are measured, calculated and displayed on GasCheck G as leak
rates or gas concentrations.
Some gases have similar thermal properties to that of air, therefore the GasCheck G can
only detect larger concentrations of these gases.
Some gases have positive and other gases negative signals. To simplify the instruments
function GasCheck G only displays changes as positive readings.
The GasCheck G can NOT differentiate between gases, selecting a specific gas on the
GasCheck G allows the instrument to calculate concentrations of that gas only if that gas is
being detected.
Prob
e
Temperature
Stable
Fan
Air flow
Display
Block

GasCheck G Instrument User Manual V2.4
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Replacing batteries
Before using the GasCheck G instrument ensure the batteries
are fitted correctly or ensure NiMH (rechargeable) batteries are
fully charged before use.
To fit or replace batteries you must first remove the battery
cover from the rear of the instrument.
This can be done by prising open the battery clip with a finger
nail or screw driver.
Removing the battery cover will reveal a battery holder, which
requires 4 x AA size batteries. Before removing old batteries or
fitting new ones unclip the battery holder from the instrument
by prising apart the PP3 type clip shown in the illustration.
Once the battery holder is disconnected from the instrument,
the batteries can be removed or replaced however care must
be taken when refitting the batteries to ensure they are the
correct polarity, polarity markings are moulded on to the
battery holder plastic.
The battery holder can be reconnected to the GasCheck G by
firmly pressing the two halves of the PP3 clip together. Care
should be taken to ensure the polarity is correct, see the PP3
diagram (right).
The battery pack is then laid within the instrument and the
battery cover refitted, be careful not to trap wires when
refitting the battery cover.
Battery holder
Battery holder
PP3 clip
PP3 clip

GasCheck G Instrument User Manual V2.4
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Getting started
The Keypad
All GasCheck G models have the same keypads, the following section explains the general functionality of each key:-
When the GasCheck G first switches on it will display its model number and
the Gas that it has been calibrated with.
A second screen then displays the instrument’s serial number, the
instrument’s firmware version and Ion Science web address.
A third screen appears to indicate the GasCheck G is Zeroing it's signal.
Once the Zero routine is complete the instrument displays it's running screen and is ready for use.
ENTER
This key is used to select functions and
accept settings after a parameter has
been adjusted.
ZERO
Pressing the Zero key Zeros-out
background readings.
On/Off.
Press this key once to switch the
instrument 'ON'. To switch the instrument
off press and hold this key until the bar
graph reaches the right side of the screen.
This procedure has been designed to avoid
accidental switch OFF.
ESCAPE
This key is used to return the display to the
previous screen and to abort an
adjustment. Repeated pressing of this key
will return the display to the 'Display
screen'. The 'ESC' key also takes you to the
menu while on the display screen.
UP
Use the UP key to scroll through
the function menu and to adjust
settings.
DOWN
Use to scroll down or change
selection.