Rosemount Model 8732C Integral Mount Magnetic Flowmeter System
4-14
CALIBRATION
The Model 8732C offers the calibration functions described below.
Gain (Electronics) Trim Gain Trim is the function by which the factory calibrates the transmitter.
This procedure is rarely needed by customers. It is only necessary if you
believe the Model 8732C is no longer accurate. It must be performed with
the coil drive mode set to 6 Hz and with a nominal flowtube calibration
number stored in the memory.
Attempting an electronics trim without a Model 8714D 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 Model 8732C to clear the message.
If the trim was completed or no error message appears, correction
requires a Model 8714D.
To simulate a nominal flowtube with the Model 8714D, you must
change the following parameters in the Model 8732C:
• Tube Calibration Number:1000015010000000
• Units: ft/s
• Upper Range Value: 20 mA = 30.00 ft/s
• Lower Range Value: 4 mA = 0 ft/s
• Coil Frequency: 6 Hz
The instructions for changing these parameters are located in the
parameter descriptions 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 Model 8714D Flowtube Simulator.
3. Power up the transmitter with the Model 8714D connected
and read the flow rate. The electronics need about a 30-minute
warm-up time to stabilize.
4. The flow rate reading after warm-up should be between
29.97 and 30.03 ft/s.
5. If the reading is within the range, return the transmitter to the
original configuration parameters.
6. If the reading is not within this range, initiate an electronics trim
with the LOI or HART Communicator. The gain trim takes about
6 minutes to complete. No transmitter adjustments are required.
HART Fast Keys
1, 2, 4, 3
LOI
Transmitter Trim
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