Emerson Series 3000 MVD Manuel D’Utilisation

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If you receive an inaccurate frequency or mA reading, there may be a problem with the output wiring 
or the receiving device.

•

Check the output level at the transmitter.

•

Check the wiring between the transmitter and the receiving device.

•

Try a different receiving device.

Depending on the setting of the Loop Current Mode parameter, the primary mA output may be fixed 
at 4 mA. In this situation:

•

The primary mA output will not report process variable data.

•

The primary mA output will not indicate fault conditions.

Corrosion, erosion, or damage to the sensor tubes can affect process measurement. To check for these 
conditions, perform the meter verification procedure, if available (see Chapter 21). If the meter 
verification procedure is not available, perform a visual inspection, or perform a density calibration 
and check for a shift in the K1 and K2 values. Contact Micro Motion customer service.

Using an incorrect flow measurement unit can cause the transmitter to produce unexpected output 
levels, with unpredictable effects on the process. Make sure that the configured flow measurement 
unit is correct. Check the abbreviations; for example, g/min represents grams per minute, not gallons 
per minute. See Section 7.3.2.

A saturated mA output or incorrect mA measurement could indicate that an incorrect 4 mA or 20 mA 
value has been configured for the mA output. Verify that these values are correct and change them if 
necessary. See Section 8.4.4.

A saturated frequency output or an incorrect frequency measurement could indicate a faulty frequency 
output scale and/or method. Verify that the frequency output scale and method are correct and change 
them if necessary. See Section 8.5.

A transmitter that is incorrectly characterized for its sensor might produce inaccurate output values. If 
the flowmeter appears to be operating correctly but sends inaccurate output values, an incorrect 
characterization could be the cause. See Section 7.3.3.