Emerson Process Management 8732 manual Electronics Trim, Transducer Block, Diagnostics, Trims

Rosemount 8732

Reference Manual

00809-0100-4663, Rev BA January 2010

Electronics Trim

375 Transducer Block, Diagnostics, Trims

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 4-12in 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.

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