ion science GasCheck 3000 User manual

Unrivalled Detection.
GasCheck 3000 & 3000IS
Instrument User Manual V2.4
Ex-Ox-Tox Gasdetectie
Westerdreef 5V
2152 CS Nieuw-Vennep
Telefoon: 0252 620885
E-mail: [email protected]l
Website: www.exoxtox.nl

Part number: 28052
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Declaration of conformity
GasCheck 3000
Manufacturer: Ion Science Ltd, The Way, Fowlmere, Cambridge, England. SG8 7UJ
Product: GasCheck 3000 (Grey Case)
Product description: a handheld micro thermal conductivity sensor used to detect gas leaks. This
has been designed specifically for search and location of non-flammable gases such as helium and
CFC’s.
Directives: 89/336/EC EMC
Standards: BS EN 61010-1:2010 Safety requirements for measurement, control & lab equipment
BS EN ISO 9001:2008 Quality management systems
BS EN 61326-1:1997 EMC – Equipment for measurement, control and laboratory use
Signed By:
Name: Mark Stockdale,
Position: Technical Director
Date: 23rd April 2007
Safety: GasCheck complies with the requirements of 73/23 EEC low voltage directive and, apart from
a low voltage pump, there are no moving parts within the instrument so that the machinery directives
are not applicable.

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Declaration of conformity
GasCheck 3000IS
Manufacturer: Ion Science Ltd, The Way, Fowlmere, Cambridge, England. SG8 7UJ
Product: GasCheck 3000is (Black Case) (intrinsic version only)
Product description: an intrinsically safe handheld micro thermal conductivity sensor designed
specifically for use in potentially explosive atmospheres and for the search and location of flammable
gas leaks.
Marking: ll 2 G Baseefa 02ATEX0093 EEx ia IIC T4 -20C Ta +60C
Notified body: ATEX: Baseefa 2001 Ltd, Rockhead Business Park, Staden Lane, Buxton, Derbyshire, SK17
9RZ
Notified body No: EC1180
Directives: 94/9/EC ATEX 100A
89/336/EC EMC
Standards: BS EN 13908:2002 ATEX – Application of quality systems
BS EN 50014:1998 ATEX – general requirements
BS EN 50020:2002 ATEX – Intrinsic safety “i”
BS EN 61010-1:2001 Safety requirements for measurement, control & lab equipment
BS EN ISO 9001:2008 Quality management systems
BS EN61326-1:1997 EMC – Equipment for measurement, control and laboratory use
Signed By:
Name: Mark Stockdale,
Position: Technical Director
Date: 23rd April 2007
Safety Rating: This intrinsic safety rating permits its deployment in all potentially explosive
atmospheres of the quoted (or less demanding) rating. That is, in areas where explosive gases (of
Group IIA, IIB and IIC) are intermittently present (Zone 1), within an ambient temperature range of -
20C and +60C.
GasCheck complies with the requirements of 73/23 EEC low voltage directive and, apart from a low
voltage pump, there are no moving parts within the instrument so that the machinery directives are not
applicable.

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Contents
Declaration of conformity............................................................................................................................... 3
GasCheck 3000 ............................................................................................................................................. 3
GasCheck 3000IS .......................................................................................................................................... 4
Statements ....................................................................................................................................................... 6
Responsibility for Use .................................................................................................................................... 6
Legal Notice ................................................................................................................................................... 6
Introduction...................................................................................................................................................... 7
Scope and definitions ..................................................................................................................................... 7
Description ..................................................................................................................................................... 7
Principal of operation ..................................................................................................................................... 7
Applications .................................................................................................................................................... 8
Technical data.................................................................................................................................................. 9
General........................................................................................................................................................... 9
Performance ................................................................................................................................................. 10
Battery data .................................................................................................................................................. 11
Control buttons ............................................................................................................................................. 14
Operation........................................................................................................................................................ 15
Display.......................................................................................................................................................... 16
Leak rate indication ...................................................................................................................................... 16
Other display symbols .................................................................................................................................. 17
Audio and visual outputs .............................................................................................................................. 17
Prepare the GasCheck................................................................................................................................. 17
Remove the Gas Check nozzle or change the probe (if required) .............................................................. 18
Switch on the Gas Check ............................................................................................................................. 19
Recommended leak search procedure ........................................................................................................ 19
Switch off the GasCheck .............................................................................................................................. 20
Inspect and clean the GasCheck ................................................................................................................. 21
Fault finding .................................................................................................................................................. 24
Storage and Disposal.................................................................................................................................... 25
Storage ......................................................................................................................................................... 25
Disposal ....................................................................................................................................................... 25
Spares and Accessories............................................................................................................................... 26
Introduction .................................................................................................................................................. 26
Spares .......................................................................................................................................................... 26
Accessories .................................................................................................................................................. 26
Calibration .................................................................................................................................................... 26
Refurbish program ....................................................................................................................................... 26
Instrument warranty and service ................................................................................................................. 27
Warranty ....................................................................................................................................................... 27
Service ......................................................................................................................................................... 27
Contact details ............................................................................................................................................. 27
Manual log...................................................................................................................................................... 28

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Statements
Responsibility for Use
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.
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.

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Introduction
Scope and definitions
This manual provides installation, operation and maintenance instructions for the GasCheck 3000 and
3000is. You must use the GasCheck as specified in this manual.
Read this manual before you install and operate the GasCheck. Important safety information is highlighted
as WARNING and CAUTION instructions; you must obey these instructions. The use of WARNINGS and
CAUTIONS is defined below.
The units of measurement used throughout this manual conform to the SI international system of units of
measurement
Description
Refer to Figure 1. The GasCheck is a portable, battery-powered, hand-held gas leak detector. Indications of
a leak are shown on the digital display (2) and are also given by a front panel mounted LED flasher (3) and
as audible clicks from the rear panel loud speaker (6). Two versions of GasCheck 3000 are available:
 The standard GasCheck 3000 - suitable for leak detection of all non-flammable gases other than air.
 The GasCheck 3000is - intrinsically safe and is suitable for leak detection of hydrogen and other
flammable gases, and for leak detection in hazardous areas of EEx ia IIC T4 rating.
The GasCheck has a convenient storage and carrying case, together with a spare battery holder, a long
flexible probe (for leak detection in areas where access is restricted) and a box-spanner for probe changing.
Principal of operation
When the GasCheck is switched on, a small internal fan draws gas samples through the probe and into the
GasCheck. The GasCheck measures the thermal conductivity of the gas samples.
When you first switch on the GasCheck (or when you press the manual zero key: see Section 4.1), an auto
zero is made. If further samples have a different thermal conductivity from the zeroed sample, the Gas
Check calculates and displays the difference as a leak rate.
This means that you can use the GasCheck to detect any gas other than that in which the Gas Check is
zeroed.
WARNING
Warnings are given where failure to observe the instruction could result in
injury or death to people.
CAUTION
Cautions are given where failure to observe the instruction could result in
damage to the equipment, associated equipment and process.

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Introduction
Applications
You can use the GasCheck on many types of applications, including those listed below.
 Quality assurance testing on manufactured component seals.
 Laboratory applications, such as the detection of leaks from gas chromatographs, from mass
spectrometers, from gas cylinders and fittings.
 Industrial applications, such as the detection of leaks from gas installations, in cylinder receiving
rooms, from pipeline assemblies, the detection of leaks from stored gases and the detection of
vapours released from stored chemicals.
 Medical applications, such as the detection of leaks from anaesthetic gas bottles and pipelines and
leak testing of membrane materials, glove boxes and so forth.
 Valve emission evaluation to EPA (Environmental Protection Agency) method 2.1
 Leak testing of pipeline joints, gaskets, chamber windows and so forth
Figure 1 – The GasCheck 3000 and 3000is
A Gas Check with short probe and nozzle fitted
B Long probe
1 Nozzle 4 Tactile keys
2 Display 5 Battery compartment
3 LED flasher 6 Loudspeaker
5
6
4
3
2
A
B
1

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Technical data
General
Operating temperature range
GasCheck 3000 0 to 50 °C 32 to 122 °F.
GasCheck 3000is -20 to +60 °C -4 to 140 °F.
Storage temperature range
-25 to 70 °C -13 to 158 °F.
Materials of construction
Storage case Polypropylene with polyester foam insert
GasCheck Polyurethane casing on 3000 only
Conductive polypropylene resin with metal bracket on 3000is only
Dimensions
Storage case 420 x 320 x 97 mm 16.5” x 12.5” x 3.75 “
GasCheck see Figure 2
Mass
Complete storage case 1.6 kg 3.5 lb.
GasCheck 0.5 kg 1.0 lb.
Ingress ratings
Minimum IP20
Figure 2 – Dimensions (mm)
* Length of short probe and nozzle. Length of long probe = 300 mm (12”)
50
*110
275

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Technical data
Performance
Detector type:
Dual micro-volume thermal conductivity cell
Gases Detected:
All gases and vapours having a different thermal conductivity to the ambient air on which it was zeroed. The
larger the difference the greater the sensitivity, so that GasCheck is not highly sensitive to the gases
normally found in large concentrations in the ambient air, e.g. N2 (nitrogen) and O2 (oxygen).
For ease of use the GasCheck groups gases having similar thermal conductivity into one of the 5 gas groups
shown in Table 1. Each group has a calibration curve stored in memory. Although the GasCheck will detect
ALL gases with a different thermal conductivity to air, Table 1 lists those 12 common tracer gases that have
been tested and assigned gas groups. If the gas or gas mixture that you seek is not included in these
groups, select group 0 (which is the most sensitive). The Gas Check will then still find leaks quickly even
though the measured values will not be displayed accurately.
Some gases give a negative response, among them argon (Ar) carbon dioxide (CO2) and R134a.
Minimum response time:
Short probe fitted Less than 1 second
Long probe fitted About 9 seconds
Recovery time About 1 second
Maximum detection level with the
short probe and nozzle fitted 20 ml/sec
The nozzle when fitted provides automatic 10-fold dilution of the gas stream entering the detector cell.
Smallest leak detection levels: see Table 1 (below)
Note1: the minimum detection levels given in Table 1 apply when the Gas Check is used in clean laboratory
air conditions. When used in conditions where the ambient atmosphere contains clouds of the gas for which
you leak test, the minimum detection levels may be obscured.
Note2: An offset of up to 10 times the detection levels given in Table 1 may be experienced in the presence
of electromagnetic interference @ 320 +- 30 MHz at the levels specified in EN 50082-1.
Table 1- Smallest Leak Detection Levels
Gas
Gas Group
Positive/Negative
Smallest Leak Detection Level in ml/sec
H2
1.5 x 10-5 ml/sec
He
2.0 x 10-5 ml/sec
R12
5.4 x 10-5 ml/sec
R1301
4.9 x 10-5 ml/sec
R134a
2.1 x 10-4 ml/sec
R22
5.1 x 10-5 ml/sec
SF6
4.4 x 10-5 ml/sec
CO2
8.0 x 10-5 ml/sec
CH4
5.8 x 10-5 ml/sec
Ar
7.0 x 10-5 ml/sec
R11
6.3 x 10-5 ml/sec
O2
5.7 x 10-4 ml/sec

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Technical data
Battery data
Note1: the energy storage capacity of batteries and even their T4 intrinsic safety rating is affected by ambient
temperature. The data in Table 2 is for an ambient temperature of 20 °C (68 °F).
Note2: the use of the back light and the IR Data Port will dramatically shorten the battery life.
WARNING
For GasCheck 3000is
Do not modify the GasCheck 3000is equipment to allow any recharging in the
instrument.
AAA Rechargeable Battery Pack (part No. A-31117)
This battery pack has been specially designed to be used with Ion Science’s
intrinsically safe gas detection instruments for example PhoCheck’s, GasCheck’s ,
FirstCheck’s and Hydrosteel 6000 is ATEX approved.
Please refer to the AAA Rechargeable Battery Pack User Instructions supplied
with the batteries.
For Intrinsic Safety T4 Rating in the Gas Check 3000is
AA rechargeable batteries must not be used in the battery holder.
There is no provision for the recharging of batteries within the GasCheck 3000is
therefore please use the Ion Science charger supplied with the AAA Rechargeable
Battery Pack (part No. A-31117)
For alkaline types (MN1500 or LR6) type use only Duracell (Standard, Procell or
Ultra)
or Ever Ready (Energiser) batteries. Alternatively use any zinc carbon types R6PP
or R6S
For GasCheck 3000
Do not modify the GasCheck 3000 equipment to allow any recharging
AAA Rechargeable Battery Pack (part No. A-31117)
This battery pack has been specially designed to be used with Ion Science’s
intrinsically safe gas detection instruments for example PhoCheck’s, GasCheck’s ,
FirstCheck’s and Hydrosteel 6000 is ATEX approved.
Please refer to the AAA Rechargeable Battery Pack User Instructions supplied
with the batteries.
Do not use in a hazardous area. Use the GasCheck 3000is.
The GasCheck 3000 is designed for use with primary (disposable) batteries.
Rechargeable AA batteries can be used for the Gas Check3000 in safe areas.
There is no provision for the recharging of batteries within the GasCheck 3000
therefore please use the Ion Science charger supplied with the AAA Rechargeable
Battery Pack (part No. A-31117)

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Technical data
Number of batteries required 4
Battery type Alkaline, size AA
Recommended batteries LR6 (R6) or MN1500
Average operating life see Table 2
AAA Rechargeable Battery Pack 1
Average operating life see Table 2
Battery type
Battery life (hours)
Gas Check 3000
Gas Check 3000is
LR6 (R6) *
40
20
MN1500 *
40
20
R6S
20
10
R6PP
20
10
AAA Rechargeable Battery
Pack
25
12
* Preferred battery types Table 2 – Average battery life
The use of the back light will dramatically shorten the battery life.
Do not change batteries in a hazardous area – see section 5.2.

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Packing list
Remove all packaging materials, then open the storage case and inspect the equipment. If the storage case
or any other item is damaged, notify your supplier and the carrier in writing within three days; state the Item
Number and the Serial Number stamped on rear case of the GasCheck, together with your order number
and your supplier’s invoice number. Do not use the GasCheck if any item is damaged.
Refer to Figure 3 and check that the storage case contains the items listed in Table 3. If any item is missing,
notify your supplier in writing within three days.
Qty
Description
Check ( )
1
Gas Check (with short probe and nozzle fitted)
1
Long probe
1
Box-spanner
1
Special screwdriver for access to battery compartment
(Gas Check 3000is only)
1
Spare battery holder with 4 batteries
Table 3 – Checklist of items in the storage case
Figure 3 – Items in the storage case
1. Long probe 4. Spare battery holder
2. Box-spanner 5. Gas Check (with short
3. Special screwdriver * probe and nozzle fitted)
 Gas Check 3000is only
5
1
4
3
2

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Operation
Control buttons
Refer to Figure 4. Use the control keys as described below. The display symbols are described in the
‘Operation’ section of the manual.
POWER (1) Press this key to switch the GasCheck on and off.
ZERO (2) Press zero to adjust for background levels, reset the peak hold memory or
after changing a gas group or a leak range as required.
GASES (3) Press and hold the gas key to scroll through the common gases and Gas
Groups of the GasCheck (shown in Table 4 below). Release when your
chosen gas is showing in the lower portion of the display. The GasCheck
display should be zeroed to maintain the calibration.
BACKLIGHT/CONTRAST (4)
Press the Contrast key once to switch ON Back-light for a pre-set period (20
seconds). Press and hold this key to change the contrast setting. The
message on the display will then show whether contrast drive is to darken or
lighten the display. There may be little or no need to use this control at
normal temperatures.
NOZZLE/PEAK HOLD (5)
When the GasCheck is applied to leak location in the presence of large
leakage, the nozzle is very useful. The nozzle symbol when displayed
corrects the leak rate range accordingly. Calibration is performed without it.
Press and hold the nozzle key to scroll through the nozzle and peak hold
options. Release when desired. Peak hold function displays the value and
range indicators for the maximum signal. Press Zero to reset this. Note that
the audio follows the detected signal even when the signal falls below the
stored peak hold value.
RANGE (6) Range may be selected to concentrate on significant leakage levels only
rather than Auto range all leakage. When auto range is selected the display
shows the auto range symbol in the lower portion. Where necessary hold
down the key to select a fixed less sensitive range rather than Auto-range in
order to restrict the leak response. The auto range symbol will not appear
on the display if auto range is not selected.

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Operation
Gas
Gas Group
Positive/Negative
H2
0
Positive
R12
0
Negative
R1301
0
Positive
R134a
0
Negative
He
1
Positive
SF6
1
Negative
R22
1
Negative
CO2
2
Negative
CH4
2
Positive
Ar
2
Negative
R11
3
Positive
O2
4
Positive
Table 4 – Gas Groups
Figure 4 – Control keys (layout shown for both Gas Check 3000 and 3000is
Backlight/Contrast
Gase
s
Power
Zero
1
2
3
4
6
5
Nozzle/Peak hold
Range

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Operation
Display
General
The display is arranged to show the leak rate and other status including user changes to the settings.
 In normal use the upper portion of the display is used for a large size digital representation of the
leak rate (see Section 4.2.2) and status information is shown as symbols (see section 4.2.3)
appearing in the lower portion. The Gas Group or the gas chosen will show on the lower right hand
side of the display.
 In response to key presses, written text will appear confirming the changes to settings.
Examples are:
 Zeroing detector
 Nozzle On
 Peak hold On
 Nozzle off
 Peak hold of
 He
 Group 0
 Contrast darker
 Contrast lighter
Leak rate indication
Leakage is displayed as a single (signed) digit x 10 (signed) range for ease of interpretation and calibration.
[Note that some gases (e.g. CO2 and R134a) may cause a negative leak indication after GasCheck zeroing
in clean air. See the Positive/Negative column in Table 4]
Examples are:
Leak rate for a positive gas: 5 x10 -5 ml / s
Leak rate for a negative gas: - 3 x10 -4 ml / s

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Operation
Other display symbols
Small display indicators show zeroing, nozzle fitted, peak hold, auto range and low battery voltage.
Zeroing This symbol appears whilst the GasCheck is zeroing then it disappears.
Auto range This symbol shows when the GasCheck leak rate is not fixed within one range.
Nozzle This symbol indicates that the GasCheck is being used with the Nozzle on.
Peak hold This symbol indicates that the GasCheck display is held to the maximum.
Low battery This symbol indicates that the battery pack is lower than required for use.
Negative This shows the leak rate signal is negative (valid for testing some gases, see Table 4).
Audio and visual outputs
The GasCheck has an internal audio sounder and a flashing LED indicator.
They both operate together when the detected leak rate climbs from the zero indication towards the
maximum on the leak rate range (see Section 4.2.1). They also operate once to confirm a key press.
Prepare the GasCheck
Select which probe to use
Note: Whenever possible, use the Gas Check with the nozzle fitted. The nozzle helps to protect the short
probe from blockage or damage. You cannot use the nozzle with the long probe.
Open the storage case and remove the Gas Check. The Gas Check is supplied with the short probe fitted
and the nozzle fitted; a long probe is supplied in the storage case. Standard use is with the short probe and
nozzle. For higher sensitivity, remove nozzle and clear the nozzle symbol from the display (section 4.1).
Determine whether you want to use the short probe or the long probe and whether you want the nozzle
fitted, as follows:
Use the Gas Check with the short probe and without the nozzle to detect small leak rates of approximately 1
x 10–4 ml/sec and lower. Press the nozzle key to clear the nozzle fitted indicator: refer to Section 4.1
The nozzle simply pulls off and pushes onto the end of the Gas Check. To remove the nozzle or to change
the probe, refer to Section 4.4.2.

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Operation
Remove the Gas Check nozzle or change the probe (if required)
In some applications the grey probe cover may restrict
access to the area under test, the grey probe cover can be
removed by pulling it off way from the instrument . When
the grey cover is removed great care should be taken
when using the instrument and the following precautions
noted:-
* Do not remove the semi transparent probe
sleeve, this sleeve ensure the metal inner probe
remains 1 mm from the surface of the test area
avoiding accidental dirt and moisture ingress.
* Do not touch the probe and especially the brass
sensor housing. Heat from fingers can result in
significant changes in signal causing false
readings.
* Avoid placing the probe on wet or dirty surfaces,
blockage of the probe will result in instrument
failure.
Some application may require a longer probe to gain
access to pneumatic joints and seams to be tested, the
GasCheck is also supplied with a 300mm probe that can
be changed by the user. To change probes carefully follow
the following steps:-
* Switch the instrument OFF
* Remove the outer grey probe cover 
* Place the box spanner (supplied with the
instrument) over the existing probe so the spanner fits over the brass nut , unscrew the probe
counter-clockwise direction. 
* Withdraw the spanner and probe assembly 
To refit the short or the long probe follow the steps above but in reverse order.
CAUTION: When using the box spanner to tighten the probe nut, ensure the nut is firmly tightened however
do not use additional tools as the tread may become damaged.
Should a probe become blocked, use dry, clean compressed air to blow out the blockage from the instrument
end of the probe.
Cautionary Note: The instrument has been factory calibrated using the standard short capillary which sets a
certain flow rate into the detector.
The long capillary by nature of its construction has a different flow to improve the time response in detection.
This will change the calibration of the instrument when the long probe is used instead of the short
capillary. Thus the long probe is only to be used in finding leaks in difficult places where the standard short
probe cannot reach. The readings given by the long probe are only qualitative and the reading given by the
display is only to be taken as being relative to another value given by another leak site while using the long
probe.
WARNING: Ensure safety guidelines are adhered to when using compressed air.
(Ion Science Ltd takes no responsibility for injury or damage caused by misuse of compressed air equipment

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Operation
Switch on the Gas Check
Press key and wait for GasCheck to bleep & flash, the display to light up and show “zeroing detector”.
When not detecting leaking gas, GasCheck still flashes and bleeps periodically to indicate that it is ON.
GasCheck remembers the settings on instrument power off so that the operator rarely if ever has to alter any
of them. The settings for gas group, auto range, peak hold and nozzle are shown on the display.
The response of GasCheck can readily be checked against an Ion Science CalCheck traceable calibration
accessory.
Recommended leak search procedure
General procedure
Note: When you use the GasCheck, do not allow dirt or debris to enter the end of the probe or nozzle. If the
probe or nozzle is blocked, the GasCheck will not operate correctly.
The following test procedures assume that you have fitted the short probe. The response time of the
GasCheck increases from about 1 second or less when the short probe is fitted to about 9 seconds when the
long probe is fitted. If you use the long probe for leak detection, ensure that you move the end of the probe
much more slowly along the area you leak test.
Ensure the part under test contains a reasonable percentage of a trace gas that is different from normal air!
Move the end of the probe (or nozzle) around the area of a suspected leak and look at the display (or listen
to the audible clicks or note the visual LED flash rate on the GasCheck) to identify the location of a leak.
Specific procedures for leak detection along seams and around pipe joints are described in the following
sections.
When required:
Use the peak hold and Auto-Ranging modes to continue to check for leaks, but to display the largest leak
detected
If you want to zero the GasCheck, move the end of the probe (or nozzle) away from any possible leak, into a
clean air zone, then press the manual zero key: refer to Section 4.1.
Note that leak sensitivity depends on the ambient conditions. If you want to accurately measure a leak,
compare the indicated leak with a calibration standard, such as a CalCheck: see Section 7.3.
When the GasCheck indicates that a leak has been found, move the probe (or nozzle) back to determine the
precise location of the leak. The leak is located where the largest leak size is indicated on the display and
where highest frequency clicks and visual flashing rate are emitted by the GasCheck, on the current range.
Leak detection along seams
Move the end of the GasCheck probe (or nozzle) along the length of the seam, so that it just rests on the
seam. The speed at which you move along the seam depends upon the size of the leak that you search for:
If the leak is large, you can move fairly fast along the seam, at approximately 25 mm per second.
If the leak is small, move slowly along the seam, at approximately 10 mm per second.

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Operation
Leak detection at pipe joints
Use the same procedure as for leak detection along seams (see Section 4.6.2), however, move the probe (or
nozzle) around the joint at approximately half the speed specified in Section 4.6.2. Light gases (such as
hydrogen and helium) diffuse quickly into air, so an apparent leak on the side or top of a joint may actually be
a leak at the bottom of the joint.
Switch off the GasCheck
When the GasCheck 3000 has been left for a few seconds without any key press, then press the I/O key.
The GasCheck will ignore I/O presses during the instrument power up sequence and during any zeroing.
Auto Shut Off
If the GasCheck is left for a period of approximately 10 minutes without key presses it will shut itself off.