INFICON Extrima Ex-certified Hydrogen Leak Detector - Manual (Page 37)

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INFICON - Operating Instructions EXTRIMA
If calibration fails you can still use the instrument. Last valid calibration parameters
will be used. You should, however, check that the instrument reacts to the reference.
Calibration messages
Below is a list of the different messages that can be displayed during calibration.
Message Explanation Remedy
Expose to
background... Prepare the probe for calibration
by holding it in hydrogen free
background.
Gas detected Gas signal is detected. Normal operation, gas exposure
can be interrupted.
Repeat cali-
bration Calibration was not within 10% of
last stored value. Wait 30 s and calibrate again.
Calibration
OK Calibration was within acceptable
limit. Press save to store calibration in
memory.
No gas or
unstable
signal No gas signal or no stable signal
detected during calibration. Check reference. Gas valve may
be shut. Check that sensor is not
clogged.
Background is higher than refer-
ence gas concentration Improve
ventilation.
Sensitivity too
low
for alarm level Sensitivity of sensor is too low
to guarantee correct response
to a gas flow or concentration
equal to the leak alarm level.
The most likely reason is that
sensor is too old. Check reference. Gas valve may be
shut. Check that sensor is not
clogged.
Check setting of Leak Alarm Level.
High signal!
Check
reference! Reference signal is abnormally
high. Check that reference gas mix is not
replaced with tracer gas mix.
Check condition of reference.
Check that reference leak connec-
tions has no leaks.