Emerson 3051S Dokumentacja Strona 87

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77
Reference Manual
00809-0100-4001, Rev JA
Section 4: Operation and Maintenance
November 2012
Operation and maintenance
a. If the pressure reading does not match the applied pressure (with high-accuracy test
equipment), perform a sensor trim. See Sensor trim overview on page 81 to
determine which trim to perform.
5. Compare the Analog Output (AO) line, on the Field Communicator or AMS, to the
digital readout device.
If the AO reading does not match the digital readout device (with high-accuracy test
equipment), perform an analog output trim. See Analog output trim” on page 77.
4.4 Analog output trim
The Analog Output Trim commands allow you to adjust the transmitter’s current output at the 4
and 20 mA (1 and 5 Vdc) points to match the plant standards. This command adjusts the digital
to analog signal conversion.
Figure 4-2. Output trim
4.4.1 Digital-to-Analog trim
Field communicator
To perform a digital-to-analog trim with a Field Communicator, perform the following
procedure.
Traditional 4-20 mA Fast Keys
1, 2, 3, 2, 1
Traditional 1-5 Vdc Fast Keys
1, 2, 3, 2, 1
Device Dashboard Fast Keys
3, 4, 2
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