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No
ITEMS
SPECIFICATION
1
Case body
Made of ABS material to mount Display and protect the circuit from surrounding environment,
outside impacts.
2
Case cover
Made of ABS material to mount Main PCB and protect the circuit from surrounding environment,
outside impacts.
3
Cover 고정 button
Device to mount cover onto Case body. Cover is opened by pushing the button and pulling the
cover forward.
4
Mount hole
Hole to mount Control unit onto outer wall or other Mount plate (2-Ø6)
5
Conduit connection
2 EA of ø22 holes are configured on upper and lower sides, respectively. Connect power cable,
signal Cable, etc. by using cable lead-in port according to field conditions
6
Concentration display
(FND Digital display)
Consecutively display measured values of the detector connected to each Channel.
Display user-designated value in blinking state upon performing Test function.
7
Power supply LED
Power LED is lighted when power is inputted.
8
Checkup LED
STD-BY LED blinks in the mode for detector checkup
9
Breakdown LED
Trouble LED is lighted upon occurrence of trouble in receiver unit and detection unit.
Ex) * Upon occurrence of defective wire connection to detector and of abnormality
10
Alarm3 LED
Alarm 3 LED is lighted upon occurrence of 3rd alarm.
Alarm 3 LED is lighted when 3rd alarm is reached upon execution of test function.
11
Alarm2 LED
Alarm 2 LED is lighted upon occurrence of 2nd alarm.
Alarm 2 LED is lighted when 2ndalarm is reached upon execution of test function.
12
Alarm1 LED
Alarm 1 LED is lighted upon occurrence of 1st alarm.
Alarm 1LED is lighted when 1st alarm is reached upon execution of test function.
13
3-color bar graph LED
3 Color bar graphic LED consecutively displays measured values and alarm setting values together
with FND display.
Bar graphic LED is lighted in green when the measured value is less than 1st Alarm, in orange
when it is more than 1st Alarm but less than 2nd Alarm, and in red when it is more than 2nd
Alarm.
When the measured value is more than the alarm setting value, Bar graphic is held at the
maximum value, and Bar graphic is displayed in blinking state for the alarm.
14
Test S/W
When test Switch is pushed, the mode performing self diagnosis function is entered into.
It is a S/W where the measured value FND blinks and Alarm operation state can be checked by
adjusting the measured value using the test Switch.
Self diagnosis is cleared by pushing buzzer stop switch and return switch.
15
Return S/W
It performs functions such as clearing of Alarm, clearing of Self test, clearing of Program setting,
etc.
16
Buzzer stop S/W
Used for buzzer stop upon occurrence of Alarm.
17
Function S/W
FUNC Switch is a key that converts and select functions such as setting of alarm value, alarm
method, Dead band of alarm, delay operation, etc. of alarm to input data values.
18
UP S/W
Used upon increasing the setting values or selecting the next setting values after selection of each
mode using the function switch.
If UP switch is pushed for a given time in the mode requiring frequent changes of setting values,
the setting values are changed fast.
No
ITEMS
SPECIFICATION
19
DOWN S/W
Used upon decreasing the setting values or selecting the next setting values after selection of
each mode using the function switch.
If DOWN switch is pushed for a given time in the mode requiring frequent changes of setting
values, the setting values are changed fast.
20
Buzzer
Operates with continuous sound when test function is performed upon occurrence of alarm and
breakdown alarm.
21
Signal I/O terminal (CN6)
Used for supply of power to gas leakage detector, outputting of 4~20mA current, connection of
cables for S-485 MODUS communication, etc.
22
Signal output terminal (CN7)
Used for outputting of Relay Dry Contact Signals such as alarm, breakdown, etc. outputting of
DC warning light Signal s, connection of cable, etc.
23
RS-485 module(Option)
RS-485 communication Module can transmit and receive current concentrations and setting
values, etc. by being connected to PC and other outside communication equipment as an
Isolation type.
24
Power supply input
Terminal (CN9)
Terminal to connect power supply cable for operation of the present control unit.
25
Power supply ON/OFF
switch
Switch used for turning ON,OFF of power supply for Control unit . When wire connection
operation for cable, etc. is performed, make sure to operate after turning OFF the power supply.
26
Power supply Terminal for
outside warning light
(CN10)
Assistance power supply Terminal to install outside warning light when the present Control unit is
operating.
[Table 1. Description on configuration of GTC-520A]
GTC-520A
Instruction Manual
4. Name and description of each part
4. Name and description of each part
