17
W
Y
P
W +
Y SIG
P -
Fig 4
SENSOR – 3 WIRE
SENSOR – 2 WIRE
INFRA RED SENSOR – 3 WIRE
Gas Detector
Control Unit
Detector Head
mV (pellistors) or 3 wire CV
W
Y
P
W +
Y SIG
P -
E
Gas Detector
Control Unit
CV
Transmitter
Gas Detector
Control Unit
Transmitter
W
Y
P
24V +
OV
+
-
SIG
Sensor
Sensor
Sensor
RED ident
–
R
= flammable
YELLOW ident
–
Y
= toxic
BLUE ident
–
B
= oxygen
GREEN ident
–
G
= others
TOXIC
SENSOR
OXYGEN
P
W
Y
P
Y
