INFICON Sensistor ISH2000P Hydrogen Leak Detector, Panel Model - Manual (Page 34)

Hydrogen leak detector Sensistor ISH2000 - Operating Instructions
32 OP-Sensistor ISH2000-EN-201203
EN
DET_ERROR will go high for a short time (1-5 seconds) when the detector is switched
on. It will go low when the sensor has been checked.
In normal operation, DET_ERROR = HIGH means that there is a problem with the
sensor, probe, or cable.
DET_WAIT is high when instrument is in warm-up mode after switching on power.
Instrument will also go into warm-up if there is a temporary fault in the sensor or
sensor connection.
The timing of the status signals in relation to different events is described by the
following two examples:
Example: Input signals issued to control the APC system should have a pulse length
of at least 40 ms.
Example: Output signals switch with a cycle time of 20 ms (0.02 s). This is the cycle
time of the APC system.
Note: Not valid for battery operated version of Sensistor ISH2000.
After power on
Fig 8-3. Status signals after power on.
When detecting a gas signal
Fig 8-4. Status signals when detecting a gas signal.
Power on Power off Warming up Detection or analysis
mode. No gas detected.
DET_SIGNAL
LEAK_OUT
DET_WAIT
DET_ON
DET_ERROR
Gas signal
Purge level
Detector signal level
0 PPM
DET_SIGNAL
LEAK_OUT
PURGE_LEVEL Trig-
ger (APC)
Purge level
Reject level