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4. Block Diagram
Max. load: 30 VDC 0.5 A (resistive load) for gas alarm contact (ZA1 or ZA2-ZC)
Max. load: 30 VDC 30mA (resistive load) for trouble alarm open collector output (TA-TC)
WARNING
Turn off the gas detector before starting wiring to prevent electric shocks.
Ground the gas detector to prevent electric shocks.
Ensure open collector output is connected (TA: + / TC: -). Due to the built-in protection
diode, incorrect polarities will cancel an active trouble alarm output.
CAUTION
The analog output line and power line of the gas detector are not isolated from each
other. When using with external devices, provide isolation to prevent noise from other
power lines from interfering with the analog output of the detector.
When wiring, place wires to avoid potential noise sources (e.g. large power transformers,
motors, and powers supply units).
Ensure cables between the gas detector and external devices are connected correctly.
Gas out
Rc 1/4
LCD
Maintennce
SW
P
Pump
Sensor
Flow
seneor
MF-50 (filter unit)
Gas in
Rc 1/4
GAS IN
Rc 1/4
Controller
F2
Power
24 VDC
TB2
1
st
stage alarm
2
nd
stage alarm
Common
Gas alarm contact output (N.O.)
PW
Jack
Earth terminal
+
-
TB1
FS
Sampling unit
P
N
G
H
E
TA
TC
TR
AL
Membrane
SW panel
Analog output
4-20mADC
Trouble alarm open collector output
+
-
A
B
Trouble alarm
RJ-45
PoE power
Ethernet signal
RS485A
RS485B
GND
RS-485 signal
CPU board
Main unit
PW SW
PW
SW
COMM
board
+
-
