Emerson Micro Motion LNG Series, Configuration And Use Manual

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10 Troubleshooting
Topics covered in this chapter:
• Status LED states
• Status alerts, causes, and recommendations
• Flow measurement problems
• Density measurement problems
• Temperature measurement problems
• Check power supply wiring
• Check grounding
• Check for radio frequency interference (RFI)
• Check for two‐phase flow (slug flow)
• Check the drive gain
• Check the pickoff voltage
• Check for internal electrical problems
10.1 Status LED states
The status LED on the transmitter indicates whether or not alerts are active. If alerts are
active, view the alert list to identify the alerts, then take appropriate action to correct the
alert condition.
Status LED states Table 10-1:
Condition LED Blinking parameter LED behavior
Normal operation (no alert) N/A Solid green
Unacknowledged corrected condition (no alert) Enabled Flashing green
Disabled Solid green
Acknowledged low-severity alert (outputs con-
tinue to report process data) N/A Solid yellow
Unacknowledged low-severity alert (outputs
continue to report process data) Enabled Flashing yellow
Disabled Solid yellow
Acknowledged high-severity alert (outputs in
fault) N/A Solid red
Unacknowledged high-severity alert (outputs in
fault) Enabled Flashing red
Disabled Solid red
Troubleshooting
Configuration and Use Manual 69