Emerson IFT9701 - Manual (Page 49)

Model IFT9701 Transmitter Instruction Manual 41
Configuration with a HART Communicator continued
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6.3 Calibration procedures
Calibration procedures include zeroing and flow calibration.
6.3.1 Auto zero
Flowmeter zeroing establishes flowmeter response to zero flow and establishes a baseline for flow
measurement.
To perform the auto zero, follow these steps:
1. Prepare the flowmeter for zeroing:
a. Install the flowmeter according to the instructions in this manual.
b. Apply power to the meter, then allow it to warm up for at least 30 minutes.
c. Run the process fluid to be measured through the flowmeter until the meter temperature
approximates the normal process operating temperature.
2. Close the shutoff valve downstream from the meter.
3. Fill the flowmeter completely with the process fluid under normal process conditions of
temperature, density, pressure, etc., and ensure zero flow through the flowmeter.
4. To initiate the auto zero procedure, use the menu below and follow these steps:
a. At the online menu, choose 2 (diagnostics/service).
b. At the diagnostics/service menu, choose 3 (perform auto zero).
c. At the perform auto zero menu, choose 1 (perform calibration).
CAUTION
Failure to zero the flowmeter at initial startup could
cause measurement error.
Zero the flowmeter before putting the flowmeter into
operation.
CAUTION
Flow through the flowmeter during flowmeter zeroing
will result in an inaccurate zero setting.
Make sure fluid flow through the flowmeter is completely
stopped during flowmeter zeroing.
1 Test/Status
2 Loop test
3 PERFORM AUTO ZERO
4 Trim Analog Output
1 Process variables
2 DIAG/SERVICE
3 Basic setup
4 Detailed setup
5 Review
1 PERFORM CAL
2 Flo
3 Zero value