INFICON Sensistor ISH2000 Hydrogen Leak Detector - Manual (Page 57)

EN- 57 Sensistor ISH2000 Technical Reference Manual (TRM)
C 300
C 300 Calibration of the leak detector
Introduction
The leak detector is the instrument and the probe together. This section consists
of step by step examples about how to calibrate the detector in the most com-
man cases.
The instrument must be calibrated by using the integrated calibration function
to make sure it displays the correct values in Analysis Mode. After calibration
the instrument will show the correct measured values on the display in Analy-
sis Mode and Combined Mode. The calibration parameters will be stored into
the probe.
Calibration reference
There is a possibility to calibrate the detector by Reference Gas or Reference
Leak.
A Reference Gas contains a well-defined concentration of Hydrogen gas in ppm
mixed by air or some inert gas. A Certificate will normal follow the gas bottles.
Reference Gas can be ordered from local gas suppliers.
A Reference Leak is a well -defined gas leak, and should be feed by same gas as
using in the detection test and with a gas pressure that is defined in the Refer-
ence Leak certificate. Reference Leak can be ordered from the detector pro-
vider.
Choose a calibration reference size, as follows recommendations:
• Same or higher than the Reject Level (but maximum 10 times higher)
• In one of the following ranges:
- 5 to 1000 ppm H2
- 1x10-5 to 1x10-2 cc/s (mbarl/s) defined for air
- 3 to 300 g/a defined for R134a
Please contact the provider of the detector for help to select optimal calibration
reference for your application.