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Configuration and Use Manual 229
Diagnostics and Troubleshooting
Diagnostics and Troubleshooting Specifications – Model 3350/3700Specifications – Model 3300/3500Measurement Performance
22.11.6 Checking the output wiring and receiving device
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.
22.11.7 Checking the Loop Current Mode parameter
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.
See Section 13.4.1.
22.12 Checking the sensor tubes
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.
22.13 Checking the flow measurement unit
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.
22.14 Checking the calibration span
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.
22.15 Checking the frequency output scale and method
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.
22.16 Checking the characterization
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.