Emerson Rosemount 8732 manual Trims, Electronics Trim

Rosemount 8732

Reference Manual

00809-0100-4665, Rev AA August 2010

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 4-14in 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.

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