Operation; Light Signals; Diagnostics And Troubleshooting; Diagnostic Information Via Light Emitting - Endress+Hauser Liquiphant FTL51B Density Operating Instructions Manual

Operation

26
9 Operation
9.1

Light signals

Yellow LED
Symbols, information
/ Stable measurement
/ Unstable measurement/process conditions
Maintenance required
Green LED
Symbols, information
 / Power on
 / Power off
Red LED
Symbols, information
/ No fault
Maintenance required
Device failure
For more information, see the Technical Information for Liquiphant Density.
10

Diagnostics and troubleshooting

The device indicates warnings and errors via the LEDs on the electronic insert. The errors
diagnosed by the device are displayed in accordance with NE107. Depending on the
diagnostic message, the device behaves as per a warning or fault condition.
The device behaves in accordance with NAMUR Recommendation NE131 "NAMUR
standard device requirements for field devices for standard applications".
10.1 Diagnostic information via light emitting diodes
10.1.1

LED at electronic insert

 indicator: power supply or off
• No supply voltage present: check supply voltage
• Reverse polarity: check terminal assignment
• Signal line is defective: check signal line
• Incorrect terminal assignment at FML: check terminal configuration at FML621
indicator: unstable process conditions
• Extreme vibrations from an external source: isolate measuring point from vibrations
• Extremely turbulent flow: provide a calming section
• Flow rate > 2 m/s: keep tuning fork away from direct flow of medium
• Buildup: remove buildup, allow for cleaning intervals
indicator: maintenance required
• Extreme vibrations from an external source: isolate measuring point from vibrations
• Flow rate > 2 m/s: keep tuning fork away from direct flow of medium
• Buildup: remove buildup, allow for cleaning intervals
• Tuning fork is blocked: change installation position
indicator: device failure
• Electronic insert is defective: replace electronic insert
• No connection to sensor: replace sensor
Liquiphant FTL51B Density
Endress+Hauser