Edwards D141-32-000, Instruction Manual

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TECHNICAL DATA
D141-32-880 Issue A
2.2 Performance
Gases detected:
The GasCheck G3 can detect any gas or vapour which has a different thermal conductivity to the ambient air in which
it was zeroed. The larger the difference the greater the sensitivity, so that GasCheck G3 is not highly sensitive to the
gases normally found in large concentrations in the ambient air, e.g. N2 (nitrogen) and O2 (oxygen).
Note: The GasCheck G3 cannot identify different gases and it cannot differentiate between different gases.
The GasCheck G3 comes supplied with an extensive list of calibration factors for common gases (refer to Table 1 ). In
addition, the GasCheck G3 comes with 5 generic 'gas groups' with a variation in sensitivities which can be used as a
substitute for gases not listed in
Table 1 (group 5 being the highest sensitivity through to group 1 being a low
sensitivity); Contact Edwards for advice on which groups to use.
Response time:
Detection time to T90 1 sec (short probe), 9 sec (long probe)
Clear down time 1 sec (short probe), 9 sec (long probe)
Minimum detectable leak Refer to Table 1
Table 1 - Smallest detectable leak levels
Name Abbreviation
Minimum sensitivity
cc/sec
Hydrogen H2 7.7 E-6 cc/sec
Helium He 1.0 E-5 cc/sec
Refrigerant R12 R12 2.7 E-5 cc/sec
Refrigerant R1301 R1301 2.4 E-5 cc/sec
Refrigerant R134a R134a 5.8 E-5 cc/sec
Refrigerant R22 R22 2.6 E-5 cc/sec
Refrigerant R11 R11 3.2 E-5 cc/sec
Sulphur Hexaflouride SF6 2.2 E-5 cc/sec
Carbon dioxide CO2 4.0 E-5 cc/sec
Methane CH4 2.9 E-5 cc/sec
Argon Ar 3.5 E-5 cc/sec
Oxygen O2 2.9 E-4 cc/sec
Refrigerant R502 R502 3.0 E-5 cc/sec
Refrigerant R404a R404a 3.2 E-5 cc/sec
Refrigerant R407c R407c 3.3 E-5 cc/sec
Refrigerant R410a R410a 3.2 E-5 cc/sec
Refrigerant R507 R507 3.8 E-5 cc/sec