Trimming Of The Sensor Trim Point - Siemens SITRANS P300 Operating Instructions Manual

Application examples
1. For a particular device that is not turned down (e.g. 63 bar), the typical measured value is
2. A 63-bar transmitter is turned down to 4 to 7 bar. You can attain the highest possible
3. A 250-mbar absolute pressure transmitter shows 25 mbar at 20 mbar (abs). A reference
7.17.2

Trimming of the sensor trim point

Trimming the lower sensor trim point
The pressure at which the lower sensor trim is to be performed is applied at the transmitter.
Via SIMATIC PDM or the HART Communicator, you instruct the transmitter to accept this
pressure.
This represents an offset shift of the characteristic curve.
Trimming the upper sensor trim point
The pressure at which the upper sensor trim is to be performed is applied at the transmitter.
Via SIMATIC PDM or the HART Communicator, you instruct the transmitter to accept this
pressure.
A gradient correction is thereby applied to the characteristic curve. The lower sensor trim
point is not affected by this. The upper trim point needs to be greater than the lower trim
point.
SITRANS P300 with HART communication
Operating Instructions, 06/2005, A5E00359579-02
50 bar. To attain the highest possible accuracy for this value, perform the upper sensor
trim at 50 bar.
accuracy by selecting 4 bar for the lower sensor trim point and 7 bar for the upper.
pressure of 100 mbar is available. You can carry out zero point correction by performing
a lower sensor trim at 100 mbar.
Note
The accuracy of the test device should be three times as high as that of the transmitter.
Operating functions via HART
7.17 Sensor trim
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