INFICON Sensistor ISH2000 Hydrogen Leak Detector - Manual (Page 61)

EN- 61 Sensistor ISH2000 Technical Reference Manual (TRM)
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Minimum calibration time
This parameter sets the lowest possible Calibration Time that can be set under
the Calibration menu. Default is 5 seconds.
Minimum calibration time should be set to safeguard so that the following two
requirements are fulfilled:
1 The hydrogen from the reference leak or gas line must reach the sensor
before end of calibration time.
2 The sensor must have time to reach its maximum signal before end of calibra-
tion time.
Setting Min Calibration Time too low will have the following effects:
• Calibration will fail if calibration time is set too low.
• Calibration might pass but be incorrect.
Setting a high Min Calibration Time will have the following effects:
• Calibration takes longer time than necessary.
• Calibration gas consumption is higher than necessary.
Note: Correct calibration is an essential parameter in quality testing. We, there-
fore, recommend that careful consideration is paid to setting an appropriate
Min Calibration Time. This will inhibit personnel, lacking detailed knowledge
about calibration, from jeopardising quality by setting a too short Calibration
Time.
Password protected calibration
If desired, the calibration can be set under the general password to prevent the
operator from calibrating by mistake. In this case you will have to enter the
password to start the calibration routine. Setting password protection on cali-
bration is done in the General Settings menu. Note that you must also set a
password. The instrument is delivered with no password set.