Sensor Calibration (Two Point) - Siemens SITRANS T4200 Operating Instructions Manual

Entering a one point trim is equivalent to entering a sensor offset. The result of the one-point
trim is saved in the "offset sensor" variables.
9.13.2

Sensor calibration (two point)

This function allows the characteristic curve of the sensor that is connected to be shifted to
intersect two calibration points. The results are then correct measured values at the sensor
trim points. A two point trim makes it possible to reduce the proportion of errors due to the
characteristic curve.
Trimming the lower sensor trim point
With this function:
● You apply the process variable, e.g. temperature or resistance - on which the lower
● You can use the operating software to instruct the transmitter to accept this process
The acceptance of this process value is represented by an offset shift to the characteristic
curve, see B in the "Sensor calibration" diagram.
Trimming the upper sensor trim point
With this function:
● You apply the process variable, e.g. temperature or resistance - on which the upper
● You can use the operating software to instruct the transmitter to accept this process
The acceptance of this process value is represented by a gradient correction to the
characteristic curve, see C in the "Sensor calibration" diagram. The lower sensor trim point is
not affected by this.
SITRANS TH200/TH300
Operating Instructions, 06/2010, A5E00393069-03
sensor calibration should be performed - to the transmitter input.
value. SITRANS TH200 uses the operating software SIPROM T; SITRANS TH300 uses
the operating software SIMATIC PDM or the HART communicator.
sensor calibration should be performed - to the transmitter input.
value.
Functions
9.13 Sensor calibration
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