Wika FLM Manual de usuario descargar pdf (Pagina 13)

WIKA operating instructions level sensor model FFG

13445627.01 12/2010 GB/D/F

5. Electrical connection

The level sensor in areas exposed to danger of explosion

are allowed to be connected to buer ampliers only if these

are certicated by a generally accepted test institute, and

if the electric specications thereof are compliant with the

following conditions:

Ui = ≤ 30 V

Ii = ≤ 0.2 A

Pi = ≤ 1 W

Level sensor model FFG

(Standard and pharmaceutical design) EEx ia

The electric specications (see product label) and the additional provisi-

ons for installing intrinsically safe circuits should be abided by. No work

is allowed to be carried out unless by trained experts.

The electric connection of the level sensor is via built-in clamps. The

given connecting pattern is conveyed by the connection diagram within

the interior of the terminal box, or by the mounting and operating instruc-

tions.

Selection of connection cable

Wiring requires a 2-core cable to be connected in the

probe head of the sensor. The cable cross-section must be

selected so that the supply voltage on the level sensor is no

less than 10 V in the borderline case of maximum current

consumption (21.5 mA) in a given cable length L.

A copper cable with a cable cross-section of 1 mm² and a

length of 100 m (100 m forward and 100 m return line) has a

resistance of 3.4 Ω (R = 0.034 Ω x L(m)/F(mm²).

5. Electrical connection

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Wika FLM Manual de usuario Pagina 13