Commissioning
Cerabar PMP23 IO-Link
24
Hauser
9.3
Configuring pressure measurement
9.3.1
Calibration without reference pressure (dry calibration =
calibration 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 calibration, 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 a pressureless condition. For information
on how to perform position adjustment, see the "Performing position adjustment"
section → 26.
For a description of the parameters mentioned and possible error messages, see the
"Description of device parameters" section → 43 and → 36.
Performing the configuration
1. Select a pressure unit, here "bar" for example, via the
Unit changeover (UNI)
parameter. Menu path: Application → Sensor → Unit changeover (UNI)
2. Select
Value for 4 mA (STL)
parameter. Menu path: Application → Current output
(OU2) → Value for 4 mA (STL). 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. Menu path: Application → Current output
(OU2) → Value for 20 mA (STU). 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 configured for 0 to 300 mbar (0 to 4.4 psi).
