INFICON Extrima Ex-certified Hydrogen Leak Detector - Manual (Page 36)

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INFICON - Operating Instructions EXTRIMA
Selecting the reference
Your reference should have a concentra-
tion or flow equal or close to what is to
be measured.
Instrument specification is valid for con-
centrations ranging from 0.1 to 10 times
the leak alarm level in the range 0.5 to
100 ppm.
Example for reference gas:
Leak Alarm Level is set at 8 PPM.
A reference gas mix containing 8 ppm
hydrogen in synthetic air will give best
accuracy.
For good accuracy, reference gas should
be within +/- 50% of leak alarm level.
In this example it means 4 to 12 ppm
Hydrogen.
Concentration of hydrogen should always
be within 2 ppm to 400 ppm.
Example for reference leak:
Leak Alarm Level is set at 2.0E-4 atm.cc/s
A reference leak calibrated to 2.0E-4 cc/s
will give best accuracy.