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Documenting Process Calibrator
Calibrating a Process Instrument
67
• Go to 100%/Go to 0%
• Go to 50%
• As Left
• Exit Cal
3. Adjust the transmitter output for 4 mA then press
the Go to 100% softkey.
4. Adjust the transmitter output for 20 mA.
5. If the span was adjusted in step 4, you must go
back and repeat steps 3 and 4 until no more
adjustment is required.
6. Now check the transmitter at 50%. If it is within
specification, your adjustment is complete. If not,
adjust the linearity and begin this procedure
again at step 3.
“As Left” Test Run
Proceed as follows to generate and record
as left
data for the thermocouple temperature transmitter
you have just adjusted.
1. Press the As Left softkey to record
as left
data.
2. Press the Auto Test softkey to begin an
automatic sequence through all the test points,
or you can step through the tests manually.
3. When the tests are complete, observe the error
summary table, such as the following.
An asterisk (*) next to a measure or source value
indicates an unsettled value (
g annunciator)
when the measurement was taken.
4. If all the results are within specification, as they
are this time, press the Done softkey. An entry in
memory is made for
as left
data.