Endress+Hauser Liquicap M FMI51 HART - Electrical Connection and Wiring; Connection Requirements and Specifications

Electrical connection Liquicap M FMI51 HART
26 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
L
DANGER
Risk of explosion!
‣
Connect the cable screen on the sensor side only!
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 Electromagnetic compatibility (EMC)
Interference emission to EN 61326, Electrical Equipment Class B. Interference immunity
to EN 61326, Annex A (Industrial) and NAMUR Recommendation NE 21 (EMC).
Failure current is accordance to NAMUR NE43: FEI50H = 22 mA.
A standard commercial instrument cable can be used.
Information on connecting shielded cables is provided in Technical Information
TI00241 "EMC test procedures".
5.1.3 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.
B
C
3
!d
A
A0040478
A Cable entry
B
Electronic insert connections - cable size max. 2.5 mm
2
(14 AWG)
C
The ground connection outside the housing, cable size max. 4 mm
2
(12 AWG)
⌀d Cable diameter