Commissioning Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART
72 Endress+Hauser
6.7.2 Calibration with reference pressure (wet 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:
The pressure values 0 mbar and 300 mbar (4.5 psi) can be specified. The device is already mounted,
for example.
!
Note!
For a description of the parameters mentioned, see Section 10.2 "Description of parameters".
Description
1 Perform position adjustment ä 56.
P01-xxxxxxxx-05-xx-xx-xx-010
Fig. 39: Calibration with reference pressure
1 See Table, Step 4.
2 See Table, Step 5.
2 Select the "Pressure" measuring mode via the
"Measuring mode" parameter.
Menu path: Setup Measuring mode
3 Select a pressure unit via the "Press eng. unit" parameter,
here "mbar" for example.
Menu path: Setup Press. eng. unit
4 The pressure for the lower-range value (4 mA value) is
present at the device, here 0 mbar for example.
Select the "Get LRV" parameter.
Menu path: Setup Extended setup Current output
Get LRV.
Confirm the value present by selecting "Confirm". The
pressure value present is assigned to the lower current
value (4 mA).
5 The pressure for the upper-range value (20 mA value) is
present at the device, here 300 mbar (4.5 psi) for
example.
Select the "Get URV" parameter.
Menu path: Setup Extended setup Current output
Get URV.
Confirm the value present by selecting "Confirm". The
pressure value present is assigned to the upper current
value (20 mA).
6Result:
The measuring range is configured for 0 to +300 mbar
(4.5 psi).
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