Emerson IFT9701 instruction manual 6.3Calibration procedures, 6.3.1Auto zero

Configuration with a HART Communicator continued

6.3Calibration procedures

Calibration procedures include zeroing and flow calibration.

6.3.1Auto zero

Flowmeter zeroing establishes flowmeter response to zero flow and establishes a baseline for flow measurement.

CAUTION

Failure to zero the flowmeter at initial startup could cause measurement error.

Zero the flowmeter before putting the flowmeter into operation.

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.

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.

4. To initiate the auto zero procedure, use the menu below and follow these steps:

		1	Test/Status
1	Process variables	2	Loop test
2	DIAG/SERVICE	3	PERFORM AUTO ZERO	1	PERFORM CAL
3	Basic setup	4	Trim Analog Output	2	Flo
4	Detailed setup			3	Zero value
5	Review

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).

Flowmeter Startup

Configuration with Communicator

Configuration with ProLink II

Troubleshooting

Model IFT9701 Transmitter Instruction Manual 41