Emerson IFT9701 用户手册

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Calibration procedures include zeroing and flow calibration.

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).

Zero the flowmeter before putting the flowmeter into 
operation.

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