INFICON Sensistor ISH2000P Hydrogen Leak Detector, Panel Model - Manual (Page 18)

Hydrogen leak detector Sensistor ISH2000 - Operating Instructions
16 OP-Sensistor ISH2000-EN-201203
EN
calibration. If the calibration is not saved, the instrument will revert to the previous
value after one minute.
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 10% 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 with reference leak
When measuring leak flow you will, in normal cases, calibrate the detector with a
reference leak.
Set the Reference Value equal to the calibrated flow of your reference leak. This
value can be found on the calibration certificate issued for the leak. Also set the
Reference Unit to the same unit as that used to express the leak rate of the reference
leak.
Example : Reference leak rate is 4.2E-5 mbarl/s.
1- Set Reference Value = 4.2E-05.
2- Set Reference Unit = “mbarl/s
Note: Feed the reference leak at the pressure stated on the calibration certificate. If
another pressure is used you must correlate the resulting flow and use this
value as
Reference Value .
Note: The concentration of the reference leak should always during the calibration
procedure be within the concentration range of 5 PPM - 400 PPM H
2.
7.5 Reference value with reference gas
When measuring hydrogen concentration (instead of leak flow) in most cases you
will calibrate the detector to a reference gas with a known concentration.
Set the Reference Value equal to the Hydrogen concentration in your reference gas.
This can be found on the certificate of analysis issued for the gas. Also set the
Reference Unit to the same unit as that used to express the leak rate of the reference
leak.
Example: Reference gas contains 10 PPM Hydrogen in synthetic air.
1- Set the Reference Value = 10
2- Set the Reference Unit = “PPM”