Ceraphant PTP31B, PTP33B Commissioning
Endress+Hauser 29
8.4.2 Calibration with reference pressure (wet calibration =
calibration with medium)
Example:
In this example, a device with a 400 mbar (6 psi) sensor is configured for the measuring
range 0 to 300 mbar (0 to 4.4 psi).
The following values should be assigned:
• 0 mbar = 4 mA value
• 300 mbar (4.4 psi) = 20 mA value
Prerequisite:
The pressure values 0 mbar and 300 mbar (4.4 psi) can be specified. For example, the
device is already installed.
Due to the orientation of the device, there may be pressure shifts in the measured
value, i.e. the measured value is not zero in a pressureless condition. For information
on how to perform position adjustment, see the "Position adjustment" → 29
section.
For a description of the parameters mentioned and possible error messages, see the
"Description of device parameters" section → 49 and .
Performing the calibration
1. Select a pressure engineering unit via the "UNI" parameter, here "BAR" for example.
Menu path: EF → UNI
2. The pressure for the LRV (4 mA value) is present at the device, here 0 bar (0 psi) for
example. Select the "GTL" parameter. Menu path: EF → I → GTL. Confirm the present
value by selecting "YES".
The present pressure value is assigned to the lower current value (4 mA).
3. The pressure for the URV (20 mA value) is present at the device, here
300 mbar (4.4 psi) for example. Select the "GTU" parameter. Menu path: EF → I →
GTU. Confirm the present value by selecting "YES".
The present pressure value is assigned to the upper current value (20 mA).
The measuring range is configured for 0 to 300 mbar (0 to 4.4 psi).
8.5 Performing position adjustment
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.
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