Electrical Connection; Connecting Requirements; Potential Equalization; Cable Specification - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Liquicap M FTI51
Endress+Hauser
5

Electrical connection

Before connecting the power supply, note the following:
• the supply voltage must match the data specified on the nameplate
• switch off the supply voltage before connecting the device
• connect the potential equalization to the ground terminal on the sensor
When using the probe in hazardous areas, the relevant national standards and the
information in the safety instructions (XA) must be observed.
Use the specified cable gland only.
5.1

Connecting requirements

5.1.1

Potential equalization

DANGER
L
Risk of explosion!
‣
Connect the cable screen on the sensor side only if installing the probe in Ex-areas!
Connect the potential equalization to the outer ground terminal of the housing (T13, F13,
F16, F17, F27). In the case of the stainless steel housing F15, the ground terminal can
also be located in the housing. For further safety instructions, please refer to the separate
documentation for applications in hazardous areas.
5.1.2

Cable specification

Connect the electronic inserts by using commercially available instrument cables. If a
potential equalization is present, and the shielded instrument cables are used, connect the
shielding on both sides to optimize the shielding effect.
 17 Probe and electronic insert connection
A Cable entry
B
Electronic insert connections: cable size max. 2.5 mm
C
The ground connection outside the housing, cable size max. 4 mm
⌀d Cable diameter
Cable entries
• Nickel-plated brass: ⌀d = 7 to 10.5 mm (0.28 to 0.41 in)
• Synthetic material: ⌀d = 5 to 10 mm (0.2 to 0.38 in)
• Stainless steel: ⌀d = 7 to 12 mm (0.28 to 0.47 in)
5.1.3

Connector

For the version with a connector M12, the housing does not have to be opened for
connecting the signal line.
B
A
C
d
2 (14 AWG)
2 (12 AWG)
Electrical connection
3
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