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１３
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6-3 Wiring
Method
Refer the gas detector’s instruction manual as well.
(1) Wiring of power source
Prepare a circuit breaker to connect the power source to the indicator and alarm unit.
(2) Connecting to the gas detector
Use a cable such as 600V vinyl insulated power line(IV),VCT or CVV(0.75-2mm
2
).The wiring length should be as
follows.
0.75mm
2
cable: within 200m
1.25mm
2
cable: within 600m
2.00mm
2
cable: within 1Km
(3) Connecting the external alarm contact
First alarm contact
1c dry contact (AC100V 2A load resistance)
COM
ZA1
ZB1
Second alarm contact
1c dry contact (AC100V 2A load resistance)
COM
ZA2
ZB2
Trouble alarm contact
1c dry contact (AC100V 2A load resistance)
COM
TA
TB
Buzzer contact
1a dry contact (AC100V 2A load resistance)
COM
BZ
Terminal for external alarm stop (AS) and external reset (AR)
AS
AR
N
Alarm can be stopped or reset externally by connecting an external switch.
(4) Connecting the analog output terminal
Gas concentration around the gas detector can be continuously monitored and recorded by connecting a
recorder to the analog output terminal. There are G(+) and H(-) terminals on the terminal block. Standard
output is 4-20 mA. Input resistance of the recorder should be 500
Ω
or less.
Turn OFF the indicator and alarm unit’s power before opening the cover of the gas detector. Opening the
cover when the power is on may cause a fire.
Ground the equipment’s main body and gas detector.
WARNING
Make sure that terminal codes of the indicator and alarm unit side and gas detector side are correct.
Use shielded cables and wire them separated from the power line as much as possible.
Concerning the external wiring work for intrinsically safe explosion proof , refer to “Safety Guidelines for
Plants’ Electric Equipment.”
CAUTION
Use the external alarm contact only for external alarm equipment and alarm indicators.
Make sure that load current and voltage do not exceed the contact’s capacity.
If you control interlock, etc. using this equipment’s external alarm contact, we are not responsible for any
injuries or damages caused by it.
CAUTION
