INFICON Helium Leak Detector Modul1000 - Manual (Page 93)

Technical Data
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CAL INT
Edge-controlled input
Change from LOW to HIGH: start internal automatic calibration.
CAL EXT
Edge-controlled input
Change from LOW to HIGH: Start external manual calibration.
CYCLE (inverted START / STOP input)
Status-controlled input
Change from LOW to HIGH: In the Standby status, START will be executed and in
the Measurement status, STOP will be executed.
GAS BALLAST ON
Edge-controlled input
Change from LOW to HIGH: The gas ballast valve is opened.
GAS BALLAST OFF
Edge-controlled input
Change from LOW to HIGH: The gas ballast valve is closed.
ZERO ON
Edge-controlled input
Change from LOW to HIGH: Activate ZERO
ZERO is switched off, when the devices switches over to Standby.
SNIFF
Status-controlled input
Change from LOW to HIGH in Standby mode:
Switching over to the SNIFF mode.
Change from HIGH to LOW in Standby mode:
Switching over to the set operating mode.