INFICON Sensistor ISH2000P Hydrogen Leak Detector, Panel Model - Manual (Page 23)

Hydrogen leak detector Sensistor ISH2000 - Operating Instructions
OP-Sensistor ISH2000-EN-201203 21
EN
record the maximum signal during 6 seconds after that the operator (or external
hardware) orders a calibration.
It is very important that all delays in gas exposure as well as reaction time of sensor
are taken into consideration when setting the calibration time. Calibration will not
be correct if the maximum signal comes after that the calibration time has
terminated.
This is also the timeout of the Calibration line in an APC program.
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 re-
quirements 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
calibration 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.
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 calibration
is done in the General Settings menu. Note that you must also set a password. The
instrument is delivered with no password set.
8.5 Detection Mode Settings
In Detection Mode , the signal is displayed in the form of a bar. The length of the bar
varies with the gas concentration.
To detect leaks
If all you wish to do is to detect the presence of a leak, that is, to find out whether
there is a leak or not, then use the Detection Mode. The definition of Leak/No Leak
will be ”A leak is a leak when it can be detected by the detector, set to a specific
sensitivity”.
NOTICE! Correct calibration is an essential
parameter in quality testing. We, therefore,
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 .