Check Grounding; Check For Radio Frequency Interference (Rfi); Check For Two-Phase Flow (Slug Flow) - Emerson Micro Motion 2700 Configuration And Use Manual

9.6

Check grounding

A sensor and the transmitter must be grounded.
Prerequisites
You will need an:
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Procedure
Refer to the sensor and transmitter installation manuals for grounding requirements and
instructions.
9.7

Check for radio frequency interference (RFI)

The transmitter's Frequency Output or Discrete Output can be affected by radio frequency
interference (RFI). Possible sources of RFI include a source of radio emissions, or a large
transformer, pump, or motor that can generate a strong electromagnetic field. Several
methods to reduce RFI are available. Use one or more of the following suggestions, as
appropriate to your installation.
Procedure
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9.8

Check for two-phase flow (slug flow)

Two-phase flow can cause rapid changes in the drive gain. This can cause a variety of
measurement issues.
1.
2.
3.
Configuration and Use Manual
Installation manual for your sensor
Installation manual for your transmitter (remote-mount installations only)
Use shielded cable between the output and the receiving device.
- Terminate the shielding at the receiving device. If this is impossible, terminate
the shielding at the cable gland or conduit fitting.
- Do not terminate the shielding inside the wiring compartment.
- 360-degree termination of shielding is unnecessary.
Eliminate the RFI source.
Move the transmitter.
Check for two-phase flow alerts (e.g., A105).
If the transmitter is not generating two-phase flow alerts, verify that two-phase flow
limits have been set. If limits are set, two-phase flow is not the source of your
problem.
Check the process for cavitation, flashing, or leaks.
Monitor the density of your process fluid output under normal process conditions.
Troubleshooting
121