Cerabar PMP21 IO-Link Commissioning
Endress+Hauser 29
9.3 Configuring pressure measurement
9.3.1 Adjustment without reference pressure (dry adjustment =
adjustment without 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:
This is a theoretical adjustment, i.e. the pressure values for the lower and upper range are
known. It is not necessary to apply pressure.
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. Select Value for 4 mA (STL) parameter. Enter the value (0 bar (0 psi)) and confirm.
This pressure value is assigned to the lower current value (4 mA).
3. Select Value for 20 mA (STU) parameter. Enter the value (300 mbar (4.4 psi)) and
confirm.
This pressure value 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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