INFICON Sensistor ISH2000 Hydrogen Leak Detector User Manual
Page 24
Hydrogen leak detector Sensistor ISH2000
-
Operating Manual
24
OM-Sensistor ISH2000-EN-201304
EN
Sensitivity too low for reject level
The Detector will warn if sensitivity of sensor is too low to safely detect a leak equal
to the set Reject Level limit. The warning can be ignored and calibration updated
and the CAL_CONF output will be set.
High signal! Check calibration leak/gas!
The Detector will warn if the calibration signal is unreasonably high. This can occur,
for example, if 5% tracer gas mix has been used instead of proper Calibration gas or
if the Calibration leak has an extra non-intentional leak. The warning can be
ignored and the calibration updated and the CAL_CONF output will be set.
Sensor condition indicator
The indicator bar extends in length when the sensor is detecting Calibration gas.
This indicator can be used for an early warning as to when a sensor replacement will
be needed.
Fig 8-3. Sensor condition indicator.
The length of the bar shows the condition of the sensor. The bar will become shorter
if the sensor has lost some in sensitivity. The scaling of the indicator is not precise
enough to say at exactly what length the sensor must be replaced. You will learn
when this happens for your particular application. The instrument will also tell you
in clear text when sensitivity is too low. See further in the next section below.
Calibration messages
Table 8-1. Different messages that can be displayed during calibration.
Message
Explanation
Action
Expose to background...
Prepare the probe for
calibration.
Hold the probe in
hydrogen free
background.
Gas detected
Gas signal is detected.
The probe has had
enough gas exposure.
Remove the probe from
the calibration gas or
leak.
Calibration in progress
Please Repeat again
Calibration was not
within 10% of last.
Wait 30 s and calibrate
again.
Calibration OK
Calibration was within
acceptable limit.
Press Save (button 4) to
store calibration in
memory.
Calibration
Expose to calibration gas
Esc
Calibration Value = 1.00+01 PPM
Gas detected