Siemens SITRANS P500, Operating Instructions Manual, Page: 160 / 238

Operate
6.3 Description of the operating functions
SITRANS P500 with HART
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Operating Instructions, 12/2014, A5E02344528-09
6.3.8 Zero point calibration (position correction)
Description
A zero point calibration is used to correct a zero point error resulting from the mounting
position. The zero point calibration can be performed by means of the keys on the device or
by means of the HART protocol.
Prerequisite
The measured value is stable. It is particularly important to check this if the device has no
display to show the measured value.
Procedure
● Make sure there is identical pressure in the two process connections.
● Perform the zero point calibration.
● Observe the damping setting.
Note
The effective measuring range is reduced by the amount of the upstream pressure.
Example:
At a pre-load pressure of 25 mbar, the upper measuring range limit of a 250-mbar
pressure transmitter is reduced to 225 mbar.
See also
"1.1.4.1 Perform Trim" (Page 71)
"2.4.2.3 Zero Trim" (Page 106)
Operation overview (Page 63)
"1.1.5 Damping" (Page 71)
6.3.9 sensor calibration
6.3.9.1 Sensor calibration
Description
The sensor trim can be used to set the characteristic curve of the pressure transmitter at two
sensor trim points. The results are then correct measured values at the sensor trim points.
The sensor trim points can be selected as any points within the nominal range.