Vega Capacitive electrodes EL 4 … 20 mA - Compact Bedienungsanleitung PDF herunterladen (Seite 25)

Capacitive electrodes EL 4 … 20 mA - Compact 25

22652-EN-020809

Electrical connection

Vessel without cathodic corrosion protection

A

B

A2

A1

E2

E1

2

1

2

1

E2

E1

A2

A1

Overvoltage

protection unit

mounted on

oscillator

Oscillator

CB

2-36

CAP

E32(H)EX

Vessel

Zone 0

Oscillator

Li=0.12 mH

Ci=6 nF

External ground terminal

Internal ground terminal

Vessel

Zone 0

CAP

E32

(H)Ex

External ground terminal

Internal ground terminal

Li, Ci of the oscillator with overvoltage

protection unit

Li = 0.27 mH

Ci = 8.5 nF

(Ex) area Zone1

Non (Ex) area

Signal

condit-

ioning

instru-

ment

or

safety

bar-

rier

Control room

optionally:

Overvoltage

protection insert

Type B62-36G

Li=0.15 mH

Ci=2.5 nF

Overvoltage protection insert

Type

B62-36G

Li=0.15 mH

Ci=2.5 nF

Insulated cable

min. 4 mm

2

*

**

Screen

A suitable cable, if necessary with metal

cover or screen, must be used between

control room and overvoltage protection

system. Metal cover or screen - if necessary

- should only be connected with one cable

end to ground or PA.

Test voltage of cable A: • 500 V AC

A suitable cable with metal cover, screen or a

suitable cable in a protective metal tube must

be used between overvoltage protection

system and capacitive electrode (metal cover

or protective tube must be connected to the

potential equalisation)

Test voltage of cable B: • 1500 V AC

A

B

Overvoltage arrester type

B62-36 G in metal or plastic

housing

**

to the potential equali-

sation line

Screen

to the potential equalisa-

tion line

b)Capacitive electrodes with external

overvoltage protection unit

a)Capacitive electrodes with integrated

overvoltage protection unit type CB 2-36

*

* optional

Connect screen only on one

cable end to ground or PA

** optional

Connect screen only on one

cable end to ground or PA

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