VEGA Capacitive electrodes EK … with signal conditioning instrument - Manual (Page 26)

26 Capacitive electrodes EK with signal conditioning instrument
A1
A2 E2
E1 1
2
Typ
B62-36G
A
Not-Ex-area
(control room)
optionally overvoltage arrester
Outer
isolation
Screen
Signal conditioning
instrument or safety
barrier
Cathodic corrosion protection
2 … 24 V (object voltage)
Note:
[A] Between control room and overvoltage
protection system a suitable cable, if
necessary with screen or metal cover, should
be used. Connect screen or metal cover - if
necessary - only to the electrode side of the
overvoltage protection system. With cathodic
corrosion protection the cable must be
provided with an outer isolation.
Ex-area
Electrode EK
External
earth
terminal
[1]
Vessel
Zone 0
Without cathodic corrosion protection: to
potential equalisation line
Electrical connection
Vessel with cathodic corrosion protection
E2
E1
A2
A1 A1
A2 E2
E1 1
2
Typ
B62-36G
Typ
B62-36G
B A
Ex-area Not-Ex-area
(control room)
optionally overvoltage arrester
Metal housing
mounted earth-free
optionally overvoltage arrester
B62 - 36 G Ex 0 (metal housing) or
B62 - 36 G Ex (plastic housing)
(L
i
= 0,15 mH, C
i
= 1,5 nF)
Electrode EK
Outer
isolation Outer
isolation
Screen
Screen
Signal conditioning
instrument or safety
barrier
Earth / PA-connection
terminal
Cathodic corrosion protection
2 … 24 V (object voltage)
External
earth
terminal
Note:
[A] and [B] see "Vessel without cathodic corrosion protection“ on
the previous page.
min. 4 mm 2 Cu
Vessel
Zone 0
Capacitive electrode with integral overvoltage protection module
Vessel with/without cathodic corrosion protection