SMAR TP302, Owner'S Operation And Maintenance Manual, Page: 24 / 54

TP302 – Operation, Maintenance and Instructions Manual
3.4
Position Trim
The TP302 provides the capability of making a trim in the input channels, if necessary.
A trim is necessary if the indicator reading of the transducer block output differs from the actual
physical output. The reason may be:
The user's current meter differs from the factory standard. The converter had its original
characterization shifted by over-load or by long-term drift.
The user can check the calibration of the transducer output by measuring the actual and compare it
with the device’s indication. If a mismatch is detected, a trim can be done.
There are at least two ways of doing the trim: using local adjustment or using Syscon (the System
Configurator from Smar).
When doing the trim, make sure you are using an appropriate meter (with the necessary accuracy).
Via SYSCON
It is possible to calibrate the current inputs of the transmitter by means of parameters
CAL_POINT_LO and CAL_POINT_HI.
Take the lower value as example:
Set the lower input position 0.0% and wait until the readout of parameter PRIMARY_VALUE
stabilizes. Write 0.0 or the lower value in parameter CAL_POINT_LO. For each value written a
calibration is performed at the desired point.
Figure 3.1 - Position Trim – Lower Value
Now, take the upper value as an example:
Set to the input position 100.0% and wait until the readout of parameter PRIMARY_VALUE
stabilizes. Write 100.0 or the upper value in the parameter CAL_POINT_HI. For each value written a
calibration is performed at the desired point.