Adjusting Zero Point (Gauge Pressure) - Siemens SITRANS P Operating Instructions Manual

Parameter assignment
9.2 Parameter assignment over device with display
The following options are available to correct zero-point errors:
Device without display
Press the
3 seconds.
For special applications (e.g. level measurement for a closed vessel), you have the option of
shifting the zero point to a desired pressure value using the "Zero point adjustment" parameter.
You proceed differently depending on the device version.
9.2.6.1

Adjusting zero point (gauge pressure)

Requirement
The pressure measurement is stable.
Procedure
1. Vent the pressure connection of the device.
2. Navigate to the parameter view.
Navigating in the views (Page 76)
3. Select the "Zero point adjustment" parameter [07].
4. Press the
The value "0" appears on the display and the "EDIT" symbol flashes.
5. Set the zero point to 0 or to the desired value.
6. Confirm the value by pressing the
7. Change to the measurement view with the
Note
Depending on the damping setting, a settling time elapses until the pressure measurement 0
appears in the measurement view.
● For this reason, vent the pressure connection of the device up to the end of the operation.
Result
● The device displays the pressure measurement 0 in the set unit.
● The effective measuring range is reduced by the amount of the upstream pressure.
Example: With an upstream pressure of 100 mbar, the effective measuring range of a 1-bar
pressure transmitter is reduced to a point between 0 and 0.9 bar.
120
Device with display
button and hold for "Zero point adjustment" parame‐
ter
button.
Remote operation
Device > Zero point adjustment
button.
button.
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC