Connecting Protective Earth (Pe); Connecting The Device; 2-Wire Density (Electronic Insert Fel60D) For Density Measurement - Endress+Hauser Liquiphant FTL51B Density Operating Instructions Manual

Liquiphant FTL51B Density
Endress+Hauser
6.2.2

Connecting protective earth (PE)

When the device is used in hazardous areas, it must always be included in the potential
equalization of the system, irrespective of the operating voltage. This is possible by
connecting to the inner or outer protective ground connection (PE).
6.3

Connecting the device

Housing thread
The threads of the electronics and connection compartment can be coated with an
anti-friction coating.
The following applies for all housing materials:
Do not lubricate the housing threads.
6.3.1 2-wire density (electronic insert FEL60D) for density
measurement
NOTICE
Operation with other switching units is not permitted.
Destruction of electronic components.
‣
Do not install the FEL60D electronic insert in devices that were originally used as point
level switches.
Terminal assignment
The output signal of the density sensor is based on pulse technology. With the aid of this
signal, the fork frequency is constantly forwarded to the Density Computer FML621.
A
3
A, E
4
B, C, D
 17 Connection diagram: electronic insert FEL60D connection to Density Computer FML621
A Connection wiring with terminals
B Connection wiring with M12 plug in housing as per EN61131-2 standard
1 Electronic insert FEL60D
2 Density Computer FML621
3 Slots A, E with extension cards (already installed in the basic unit)
4 Slots B, C, D with extension cards (optional)
1
Pulse
– +
1 2
-
.
10 82
110 83
- +
112 182
113 183
-
+
Electrical connection
B
M12
4 3
1
1 2
L+ L- PE
2
3 4
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