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Reference Manual
00809-0100-4665, Rev AA
August 2010
Rosemount 8732
4-10
Trims Trims are used to calibrate the transmitter, re-zero the transmitter, and
calibrate the transmitter with another manufacturer’s sensor. Proceed with
caution whenever performing a trim function.
Electronics Trim
Electronics trim is the function by which the factory calibrates the transmitter.
This procedure is rarely needed by customers. It is only necessary if you
suspect the Rosemount 8732E is no longer accurate. A Rosemount 8714
Calibration Standard is required to complete an Electronics trim. Attempting
an Electronics trim without a Rosemount 8714 Calibration Standard may
result in an inaccurate transmitter or an error message. Electronics trim must
be performed only with the coil drive mode set to 5 Hz and with a nominal
sensor calibration number stored in the memory.
NOTE
Attempting an Electronics trim without a Rosemount 8714 may result in an
inaccurate transmitter, or an “ELECTRONICS TRIM FAILURE” message may
appear. If this message occurs, no values were changed in the transmitter.
Simply power down the Rosemount 8732E to clear the message.
To simulate a nominal sensor with the Rosemount 8714, you must change the
following parameters in the Rosemount 8732E:
1. Sensor Calibration Number—1000015010000000
2. Units—ft/s
3. Coil Drive Frequency - 5 Hz
The instructions for changing the Sensor Calibration Number and Units are
located in “Flow Units” on page 3-7. Instructions for changing the Coil Drive
Frequency can be found on page 4-14 in this section.
Set the loop to manual, if necessary, before you begin. Complete the following
steps:
1. Power down the transmitter.
2. Connect the transmitter to a Rosemount 8714 Calibration Standard.
3. Power up the transmitter with the Rosemount 8714 connected and
read the flow rate. The electronics need about a 5-minute warm-up
time to stabilize.
4. Set the 8714 calibrator to the 30 ft/s setting.
5. The flow rate reading after warm-up should be between 29.97 and
30.03 ft/s.
6. If the reading is within the range, return the transmitter to the original
configuration parameters.
7. If the reading is not within this range, initiate an Electronics trim with
the Profibus PA configuration tool. The Electronics trim takes about
90 seconds to complete. No transmitter adjustments are required.