Endress+Hauser Liquiphant FTL51B Operating Instructions Manual page 34

Electrical connection
34
1 Pressure and temperature information required depending on the application
2 Liquiphant sensor with electronic insert FEL60D (pulse output)
3 Temperature sensor (e.g. 4-20 mA output)
4 Pressure transmitter (4-20 mA output)
5 Liquiphant Density and Concentration Computer FML621 with display and operating unit
6 PLC
Light signals
LED Symbol
Yellow
Green 

Red
For more information, see the Technical Information for density measuring
technology.
1 1
2 3 4
Information
Measurement valid
Unstable process situation
Maintenance required
Power on
Power off
No error
Maintenance required
Device failure
Liquiphant FTL51B
E X E X
FML621
6
FML621
5
6
Endress+Hauser
A0037880