Answer / carl_ellis

Disconnect the field sensor.

Connect a calibrated/traceable temperature signal calibrator.

Apply LRV value.

Trim the 4.0mA output.

Apply the URV value.

Trim the 20.0mA output.

Check as many interim points as the calibration protocol requires and note the output and the deviation from the expected value.

Determine whether the transmitter is within spec from the deviation values seen.

If transmitter passes, reconnect the field sensor to the input.

Fill in the paperwork.

Carl Ellis
Measure First

Answer / eid elatawy

First i have to know the connected element
1. RTD :using resistance box and divide the range into 4 quarters for example the range 0 to 100 deg we have 0,25,50,75,100 will find the related resistance from the table and see the transmitter output and if any deviation will make trim zero and span trim.
2. TC the same idea but we use MV supply and by using TC tables.

Answer / karishma

First do span and zero adjustment of a temperature transmitter. Then when the input signal is zero the output is 4mA if not readjust the span and zero again provide 25% 50% 75% 100% Signal and see the output it should give 20 mA for 100% signal input. 

suppose, after calibrating a transmitter we fixed it in a process line. At live zero condition the Tx shows 4.5 mA. what should we do to make the Tx show 4 mA? If we adjust zero, will it not affect the calibration?

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