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72
Reference Manual
00809-0200-4728, Rev RA
Section 5: Operation and Maintenance
April 2015
EMF compensation allows the transmitter to provide sensor measurements that are unaffected
by unwanted voltages, typically due to thermal EMFs in the equipment connected to the
transmitter, or by some types of calibration equipment. If this equipment also requires steady
sensor current, the transmitter must be set to “Active Calibrator Mode.” However, the steady
current does not allow the transmitter to perform EMF compensation and as a result, a
difference in readings between the Active Calibrator and actual sensor may exist.
If a reading difference is experienced and is greater than the plant’s accuracy specification
allows, perform a sensor trim with “Active Calibrator Mode” disabled. In this case, an active
calibrator capable of tolerating pulsating sensor current must be used or the actual sensors
must be connected to the transmitter. When the Field Communicator, AMS Device Manager, or
the LOI asks if an Active Calibrator is being used when the sensor trim routine is entered, select
No
to leave the “Active Calibrator Mode” disabled.
5.5
Trim the analog output
5.5.1
Analog output trim or scaled analog output trim
Perform an Output Trim or a Scaled Output Trim if the digital value for the primary variable
matches the plant’s standards but the transmitter’s analog output does not match the reading
on the output device. The output trim function calibrates the transmitter to a 4–20 mA
reference scale; the scaled output trim function calibrates to a user-selectable reference scale.
To determine the need for an output trim or a scaled output trim, perform a loop test
(
“Performing a loop test” on page 36
Figure 5-4. Measurement Dynamics of a SMART
™
Temperature Transmitter
5.5.2
Analog output trim
The
Analog Output Trim
allows the transmitter’s conversion of the input signal to a 4–20 mA
output to be altered (
). Adjust the analog output signal at regular intervals to
maintain measurement precision. To perform a digital-to-analog trim, perform the following
procedure with Traditional Fast Key sequence:
Performing an analog output trim using a Field Communicator
1.
Connect an accurate reference meter to the transmitter at the
CONNECT REFERENCE
METER
prompt by shunting the power to the transmitter through the reference meter
at some point in the loop.
Microprocessor
Digital-to-Analog
Signal Conversion
Analog-to-Digital Signal
Conversion
Transmitter electronics module
Analog
Input
Analog
Output
Field
Communicator
HART
Output
Sensor and Ohm/mV
Trim adjust the signal here
Output and Scaled Output
Trim adjust the signal here
Содержание Rosemount 644
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