Vega EL 11 - Vessel Without Cathodic Corrosion Protection

Capacitive electrodes EL 4 … 20 mA - compact 25
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 earth terminal
Internal earth terminal
Vessel Zone 0
CAP E32 (H)Ex
External earth terminal
Internal earth terminal
Li, Ci of the oscillator with overvoltage protection unit Li = 0,27 mH Ci = 8,5 nF
(Ex)-area Zone 1
Not (Ex)-area
Signal cond. instr. or safety barrier
Control room either: Overvoltage protection unit
Type B62-36G Li=0,15 mH Ci=2,5 nF
Overvoltage protection unit
Type B62-36G Li=0,15 mH Ci=2,5 nF
Isolated line min. 4 mm
2
* **
Screen
Between control room and overvoltage protection system a suitable cable, if necessary a metal cover or screen, must be used. Metal cover or screen - if necessary - must only be connected to earth or PA on one line end. Test voltage of the cable A: ≥ 500 V AC
Between overvoltage protection system and capacitive electrode a suitable cable with metal cover, screen or a suitable cable with metal protection tube must be used (metal cover or protection tube must be connected with the potential equalisation). Test voltage of the cable B: ≥ 1500 V AC
A B
Overvoltage arrester type B62-36 G in metal or plastic housing
**
to potential equalization line
Screen
to potential equalization line
b)Capacitive electrodes with external
overvoltage protection unit
a) Capacitive electrodes with integral
overvoltage protection unit type CB 2-36
*
* either screen only connected on one line end to earth or PA
** either screen only connected on one line end with earth or PA