15.12 Checking Slug Flow; 15.13 Checking The Characterization; 15.14 Checking The Calibration; 15.15 Diagnosing Wiring Problems - Emerson Micro Motion 3711 Configuration And Use Manual

Maintenance and Troubleshooting

15.12 Checking slug flow

Slugs – gas in a liquid process or liquid in a gas process – occasionally appear in some applications.
See Section 5.5.4 for a description of slug flow functionality.
If slug flow occurs:
• Check process for cavitation, flashing, or leaks.
• Change the sensor orientation.
• Monitor density.
• If desired, change the slug flow limits to accept a wider density range.
• If desired, change slug duration.

15.13 Checking the characterization

If the system appears to be operating correctly but sends inaccurate process data, an incorrect
characterization could be the cause. Check characterization values. See Section 5.5.1.

15.14 Checking the calibration

Inaccurate calibration can produce inaccurate output values. If the system appears to be operating
correctly but provides inaccurate process data, an inaccurate calibration may be the cause.
Micro Motion calibrates the Model 3711 system at the factory. Therefore, you should suspect
inaccurate calibration only if the system has been calibrated after it was shipped from the factory.
The density calibration procedure in this manual (see Appendix B) is designed for calibration to a
regulatory standard. To calibrate for true accuracy, always use a measurement source that is more
accurate than the meter.
Contact the Micro Motion customer service department before calibrating your system.
Note: Micro Motion recommends using meter factors, rather than calibration, to prove the meter
against a regulatory standard or to correct measurement error. For information on meter factors, see
Section 5.5.3.

15.15 Diagnosing wiring problems

Use the procedures in this section to check the Model 3711 installation for wiring problems.
Removing the wiring compartment covers in explosive atmospheres while
the power is on can subject the transmitter to environmental conditions that
can cause an explosion.
Before removing the wiring compartment cover in explosive atmospheres, be sure
to shut off the power and wait five minutes.
Configuration and Use Manual
WARNING
179