Description of device parameters Ceraphant PTP31B, PTP33B
60 Endress+Hauser
LO Min value (minimum indicator)
Navigation EF → LO
Description This parameter (also known as the minimum indicator) makes it possible to call up
retroactively the lowest value ever measured for pressure.
A pressure that is present for at least 2.5 ms is logged to the maximum indicator.
The maximum indicators cannot be reset.
Factory setting Start value URL, cannot be deleted afterwards
ZRO manual position adjustment (typically for absolute pressure sensor)
Navigation EF → ZRO
Description The pressure resulting from the orientation of the device can be corrected here.
The pressure difference between zero (set point) and the measured pressure must be
known.
Prerequisite An offset is possible (parallel shifting of the sensor characteristic) to correct the
orientation and any zero point drift. The set value of the parameter is subtracted from the
"raw measured value". The requirement to be able to perform a zero point shift without
changing the span is met with the offset function.
Maximum offset value = ± 20 % of the sensor nominal range.
If an offset value is entered that shifts the span beyond the physical limits of the sensor,
the value is admitted but a warning message is generated and shown on the display. The
warning message only disappears when the span is within the sensor limits, taking the
offset value currently configured into consideration.
The sensor can
• be operated in a physically unfavorable range, i.e. outside its specifications, or
• be operated by making appropriate corrections to the offset or span.
Raw measured value – (manual offset) = display value (measured value)
Example • Measured value = 2.2 mbar (0.033 psi)
• Set the measured value in the parameter to 2.2.
• Measured value (after position adjustment) = 0.0 mbar
• The current value is also corrected.
Note Setting in increments of 0.1. As the value is entered numerically, the increment depends
on the measuring range
Options No selection. The user is free to edit the values.
Factory setting 0
GTZ automatic position adjustment (typically for gauge pressure sensor)
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