Configuring Pressure Measurement - Endress+Hauser IO-Link Ceraphant PTC31B Operating Instructions Manual

Commissioning
36
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 →  38.
For a description of the parameters mentioned and possible error messages, see the
"Description of device parameters" section →  56 and →  44.
Performing the configuration
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 configured for 0 to 300 mbar (0 to 4.4 psi).
Ceraphant PTC31B, PTP31B, PTP33B IO-Link
Endress+Hauser