Commissioning Cerabar PMP21 IO-Link
30 Endress+Hauser
9.3.2 Adjustment with reference pressure (wet adjustment =
adjustment 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 an unpressurized state. For information
on how to perform position adjustment, see the "Performing position adjustment"
section.
For a description of the parameters mentioned and possible error messages, see the
"Description of device parameters" section.
Carrying out the adjustment
1. Select a pressure unit, here "bar" for example, via the Unit changeover (UNI)
parameter.
2. The pressure for the LRV (4 mA value) is present at the device, here 0 bar (0 psi) for
example. Select Pressure applied for 4mA (GTL) parameter. The selection is
confirmed by pressing "Get Lower Limit".
The pressure value present at the device is assigned to the lower current value
(4 mA).
3. The pressure for the full scale value (20 mA value) is present at the device, here for
example 300 mbar (4.4 psi). Select Pressure applied for 20mA (GTU) parameter.
The selection is confirmed by pressing "Get Lower Limit".
The pressure value present at the device is assigned to the upper current value
(20 mA).
The measuring range is set for 0 to 300 mbar (0 to 4.4 psi).
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