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Reference Manual
00809-0100-4663, Rev BA
January 2010
Rosemount 8732
4-10
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 a digital 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 a “DIGITAL 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 five parameters in the Rosemount 8732E:
1. Sensor Calibration Number—1000015010000000
2. Units—ft/s
3. PV URV—AI EU at 100 = 30.00 ft/s
4. PV LRV—AI EU at 0 = 0 ft/s
5. Coil Drive Frequency—5 Hz
The instructions for changing the Sensor Calibration Number, Units, PV URV,
and PV LRV are located in “Basic Setup” on page 3-14. Instructions for
changing the Coil Drive Frequency can be found on page 4-12 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 sensor simulator.
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 a digital trim with the
Handheld Communicator. The digital trim takes about 90 seconds to
complete. No transmitter adjustments are required.
375 Transducer Block, Diagnostics, Trims