INFICON Sensistor ISH2000P Hydrogen Leak Detector, Panel Model - Manual (Page 21)

Hydrogen leak detector Sensistor ISH2000 - Operating Instructions
OP-Sensistor ISH2000-EN-201203 19
EN
Sensor condition indicator
The indicator bar extends in length when the sensor is detecting reference gas. This
indicator can be used for an early warning as to when a sensor replacement will be
needed.
Fig 8-2. 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 Remedy
Expose to background... Prepare the probe for
calibration by holding it
in hydrogen free
background. -
Detecting gas Gas signal is detected. Normal operation, gas
exposure can be
interrupted.
Repeat calibration Calibration was not
within 20% of last. Wait 30 s and calibrate
again.
Calibration OK Calibration was within
acceptable limit. Press Save (button 4) 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 probe tip is
not clogged.
Signal when reference
gas is shut off. Happens
for reference gas only. Background is higher
than reference gas
concentration. Improve
ventilation.