Operation
6.5 Local operation
SITRANS P DS III with PROFIBUS PA
92 Operating Instructions, 06/2013, A5E00053276-07
If the calibration was successful, the current measurement value of the device will be
displayed, and will correspond to the calibration value as long as the reference pressure is
still applied.
If you switch to the measured value display without taking a sufficiently large calibration span
into account, the pressure status "Bad" B_004 will be displayed.
The failure logic of the function block is activated. The output has the status "Unsure" U_0xx,
depending on the setting.
If the two calibration points are too close together, status F_006 is displayed. The smallest
calibration span depends on the nominal measurement range. Select either the higher
reference pressure in mode 20, or the lower reference pressure in mode 19.
As long as mode 19 is active, you can repeat this procedure as often as necessary.
To view the LO calibration, proceed as follows:
1. Set mode 19.
The display shows the value of the last calibration procedure, with the appropriate unit.
2. Leave the mode by pressing [M].
Errors (Page 188)
Calibrating the sensor (Page 126)
HI calibration
Introduction
The slope of the characteristic is changed in mode 20. This rotates the characteristic around
setting point LO.
The unit in which you want to calibrate is set using the following functions:
● In mode 13, set the source of the measured value display[7] : Raw pressure value,
variable SENS.
● In mode 14, select the desired pressure unit.
Note
If you change this setting, the measurement range can be restricted to the point that the
pe
rmissible sensor limits are violated even with small pressure changes.
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