Ion Science GasCheck IS - Manual (Page 9)

GASCHECK 5000IS MANUAL Ion Science Ltd
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Technical data
Minimum detection levels
see Table 1
The nozzle when fitted provides automatic 10-fold dilution of the gas stream entering the Gas Check TCD,
except when the ppm display is selected. The Gas Check nozzle should always be removed for assessing
gas concentration levels in volume spaces smaller than about 1 litre when you are using the ppm display.
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
H
2
0 Positive 1.5x 10 -5 ml/sec
He 0 Positive 2.0 x 10 -5 ml/sec
R12 1 Negative 5.4 x 10 -5 ml/sec
R1301 1 Positive 4.9 x 10 -5 ml/sec
R134a 1 Negative 2.1 x 10
-4
ml/sec
R22 1 Negative 5.1 x 10 -5 ml/sec
SF
6
1 Negative 4.4 x 10
-5
ml/sec
CO
2
2 Negative 8.0 x 10
-5
ml/sec
CH
4
2 Positive 5.8 x 10 -5 ml/sec
Ar 2 Negative 7.0 x 10
-5
ml/sec
R11 3 Positive 6.3 x 10
-5
ml/sec
O
2
4 Positive 5.7 x 10
-4
ml/sec
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.