User Manual

Maintenance
Fused mode analog outputs
4
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4 Maintenance
4.1 Fused mode analog outputs
QBM37.. Are supplied with a fused mode. This prevents damage caused by an
interruption in Modbus communications.
The analog outputs are switched to DC 0 V for interruptions to communications
>60 seconds.
4.2 Zero reset
Perform the zero reset without tubes. Afterwards reconnect the tubes
NOTICE
Use cases for the zero reset
● As the allowed mounting position is vertical only (see "Mounting [➙ 4]"), the
sensor does not have to be recalibrated during commissioning in the case of
normal pressure measurement.
● Only in case of relative pressure measurement (pressure nipple "-" connected
to ambient atmosphere) a zero point calibration is recommended during
commissioning.
10...20 s
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