Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART Commissioning
Endress+Hauser 71
6.7 Pressure measurement
6.7.1 Calibration without reference pressure (dry calibration)
Example:
In this example, a device with a 400 mbar (6 psi) sensor is configured for the 0 to +300 mbar (4.5
psi) measuring range, i.e. 0 mbar is assigned to the 4 mA value and 300 mbar (4.5 psi) to the 20
mA value.
Prerequisite:
This is a theoretical calibration, i.e. the pressure values for the lower and upper range are known.
!
Note!
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 ä 56.
Description
1 Select the "Pressure" measuring mode via the
"Measuring mode" parameter.
Menu path: Setup Measuring mode
P01-xxxxxxxx-05-xx-xx-xx-010
Fig. 38: Calibration without reference pressure
1 See Table, Step 3.
2 See Table, Step 4.
2 Select a pressure unit via the "Press eng. unit" parameter,
here "mbar" for example.
Menu path: Setup Press. eng. unit
3 Select the "Set LRV" parameter.
Menu path: Setup Set LRV
Enter the value for the "Set LRV" parameter (here 0
mbar) and confirm. This pressure value is assigned to the
lower current value (4 mA).
4 Select the "Set URV" parameter.
Menu path: Setup Set URV
Enter the value for the "Set URV" parameter (here
300 mbar (4.5 psi)) and confirm. This pressure value is
assigned to the upper current value (20 mA).
5Result:
The measuring range is configured for 0 to +300 mbar
(4.5 psi).
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