YOKOGAWA SC200 - Page 14

IM 12D7B2-E-H
Wiring diagrams for hazardous areas
10
Intrinsically safe design
(CELENEC standard EEX ib [ia] IIC T4)
Conductivity transmitter
EXA SC200S
EEx ib
certified safety
barrier
Distributor
Output
Sensor
Elektronic current
Limiting barrier
Vmax: 31.5 V
lmax : 35 mA
Pmax: 0.66 W
Zener barrier with
resistor
Vmax: 28 V
lmax : 93.3 mA
Pmax: 0.66 W
Protective earth
Safe area
Protective earth
Hazardous area Supply
Zone 0 of 1 Zone 1
Eex ib
Certified distributor with
input/output
isolation
Output
Sensor
Shunt zener-
barrier or
supply unit or
isolated
repeater
Vmax: 22 V
Imax : 85 mA
Protective earth
Safe areaHazardous area
Supply
Zone 0 of 1 Zone 1
Intrinsically safe design
(CELENEC standard EEX ib [ia] IIC T4)
Conductivity transmitter
EXA SC200S