INFICON Sensistor ISH2000 HySpeed Hydrogen Leak Detector - Manual (Page 18)

Hydrogen leak detector Sensistor ISH2000 HySpeed - Operating Instructions
18 OP-Sensistor ISH2000 HySpeed-EN-201203
EN
Note: You will need to repeat the calibration 2-3 times to get Calibration OK after
changing setup or probe.
• Allow at least 30 seconds between each calibration for best accuracy!
• If the message “ No Gas or Unstable Signal ” is displayed repeatedly - go back to
Detection Mode and check functionality.
• If Repeat Calibration is displayed then this means that the measured value
deviated more than 25% (can be changed between 1-100%) from the previous
calibration. Repeat the calibration procedure.
Also set the Analysis Unit to the same as the Reference Value. If you want to use
another unit you have to put a recalculation number into
Correlation Value which
describes the relationship between the different units.
7.4 Reference value by gas concentration
The concentration of the reference gas should be near to or slightly higher Reject
Level the for best accuracy and always within the range of 20-50000 ppm
Set the Reference Value equal to the Hydrogen concentration in your reference gas.
If premixed reference gas is used, the reference value be found on the certificate of
analysis issued for the gas concentration. Also set the
Reference Unit to the same unit
as that used to express the leak rate of the reference leak.
Example: Reference gas concentration contains 100 PPM Hydrogen.
1- Set the Reference Value = 100
2- Set the Reference Unit = “PPM”