Gas Detection GDA 3000, Operating Manual

Page: 9 / 44

Gas Detection (Australia) Pty Ltd Page 9 of 44 M-GDA-3000 Rev 1
4.2. Components Description
No. Name of component Description
1 Housing
Protecting sensors and PCB boards equipped inside the
device housing against environmental variations and shocks
2 Main PCB
Amplifying the output signal generated by sensor, converting it
to standard output of DC 4-20mA and transmitting converted
signal. And transmitting isolated RS-485 communication signal
and alarm relay contact signal. Also delivering data which will
be shown in display panel.
3 Display PCB
Showing data sent by main PCB in LCD or OLED. Also
displaying current event status with using power lamp, alarm
lamp and trouble lamp.
4 Power/Signal Terminal
CN12 is composed of connection terminal for supplying DC18-
24V power and connection terminal for standard output (viso,
+, mA, -).
5 Alarm signal Terminal
CN8 is an alarm signal connection terminal which outputs relay
contacts of trouble, alarm1 and alarm 2.
6 RS-485 signal terminal
CN3 is a signal connection terminal(A,B) for isolated RS-485
communication.
7 Sensor terminal C10 is a sensor connection terminal(RD, WH, BK, BE).
8 Power on/off switch
Turning on or off power of gas detector. The switch should be
turned off when cable work or A/S is performed. After finishing
those works, the switch can be on.
9 Power lamp When power switch turns on, this power lamp light will be on.
10 Trouble lamp
When fault occurs in circuit or sensor sensitivity, the trouble
lamp will be on.
11 Alarm1 lamp
The alarm1 lamp turns on when the measured value of gas
becomes over alarm1 level on gas leakage.
12 Alarm2 lamp
The alarm2 lamp turns on when the measured value of gas
becomes over alarm2 level on gas leakage
13 Function switch
In order to set parameters, this function switch is used to allow
the device to enter program mode by touching it with magnet-
bar for 2 seconds or more(Program mode, Calibration mode
and Test mode are also provided). The switch is also used to
input and set data.
14 Reset switch
Reset switch can be used to cancel setting parameter or return
back to previous state by touching it once with magnet bar.
(Each time it is touched with magnet bar, the mode will be
switched back to the immediate previous mode)
15
↑(Up) switch
This switch is used to transit mode or adjust number by
touching it with magnet bar. The mode will be switched in a
forward direction and the number in an increasing direction.