Siemens SITRANS P DS III - Correcting for Positional Error

Operator control functions via PROFIBUS
7.12 Correcting for positional error
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
127
Calibrating the upper point
To calibrate the upper point, proceed as follows:
1. Call up the dialog "Sensor calibration".
2. Switch to the "Upper calibration" tab.
3. Apply the reference pressure for the upper calibration point.
4. Enter the value of the reference pressure in the field "upper calibration point".
5. Click on "Transmit".
In the field "Pressure cleaned raw value", observe the effect of the calibration. In the "Upper
calibration point" box, you can see whether the new calibration point was accepted.
After both points have been calibrated, the status of the measured value must be "Good". If
the status "Bad, configuration error" is displayed, the calibration was smaller than the
smallest calibration span. You must move the calibration points away from one another by
moving one of the two calibration points.
See also
LO calibration (Page 91)
HI calibration (Page 92)
7.12
Correcting for positional error
External influences can affect the original zero point. External influences include:
● Installation position
● Ambient temperature
● Installation-caused preset pressures, for instance fluid columns in the pressure line to the
transmitter
You can correct for these influences within the following limits.
Differential pressure
-100 % to +100 % of the nominal measurement range
Pressure
-
100 %, but not more than -1 bar
up to +100 % of the nominal measurement range
Absolute pressure
Correction for positional error not possible
Procedure
To correct for positional error, proceed as follows:
1. Call up the dialog "Correct for positional error".
2. Create a pressure calibration.
3. Click on "Transmit".