Emerson Process Management MICRO MOTION 2400S - Manual (Page 130)

122 Micro Motion ® Model 2400S Transmitters for DeviceNet ™
Troubleshooting
If slug flow occurs:
• Check the process for cavitation, flashing, or leaks.
• Change the sensor orientation.
• Monitor density.
• If desired, enter new slug flow limits (see Section 8.7).
- Raising the low slug flow limit or lowering the high slug flow limit will increase the
possibility of slug flow conditions.
- Lowering the low slug flow limit or raising the high slug flow limit will decrease the
possibility of slug flow conditions.
• If desired, increase slug duration (see Section 8.7).
11.15 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. See Chapter 10.
11.16 Checking the flow measurement configuration
Using an incorrect flow measurement unit can cause the transmitter to report unexpected process
variable values, 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 6.3.
11.17 Checking the characterization
A transmitter that is incorrectly characterized for its sensor might report inaccurate process variable
values. Both the K1 and Flow Cal (FCF) values must be appropriate for the sensor. If these values are
incorrect, the sensor may not drive correctly or may send inaccurate process data.
If you discover that any of the characterization data are wrong, perform a complete characterization.
See Section 6.2.
11.18 Checking the calibration
Improper calibration can cause the transmitter to report unexpected process variable values. If the
transmitter appears to be operating correctly but sends unexpected process variable values, an
improper calibration may be the cause.
Micro Motion calibrates every transmitter at the factory. Therefore, you should suspect improper
calibration only if the transmitter has been calibrated after it was shipped from the factory. Before
performing a calibration, consider meter validation or meter verification and select the appropriate
procedure (see Section 10.2). Contact Micro Motion customer service for assistance.
11.19 Checking the test points
Some status alarms that indicate a sensor failure or overrange condition can be caused by problems
other than a failed sensor. You can diagnose sensor failure or overrange status alarms by checking the
flowmeter test points. The test points include left and right pickoff voltages, drive gain, and tube
frequency. These values describe the current operation of the sensor.