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GTC-520F
Instruction Manual
6. Operation Method
6. Operation Method
■ Check wirings for operation power, detection parts, alarm parts, and concentration display.
■ Check the power input then turn ON the power S/W.
■ Check whether power LED at alarm and concentration display parts light on.
■ Check whether "SELF" is displayed on FND concentration display part.
6.1. Power ON
- After GTC-520F power turns ON, the current firm ware version is displayed.
- VER is displayed for 0.5 sec on FND then number displays.
- The current version is 2.03.
- After warming-up by "SELF" flashing for approx. 30 sec on FND of concentration display,
it immediately enters the measurement mode.
- Upon an event of fault of the equipment or detector at this time, fault alarm appears.
■ After power on, when there is no error from "SELF TEST", it automatically enters Measuring Mode.
6.2. Measuring Mode
- Displays gas concentration received by the detector on FND digital display in numbers.
- Gas concentration is also displayed by 3-color bar graphic LED. Concentrations below the
primary alarm concentration in green, below the secondary alarm concentration in orange,
and above the secondary alarm concentration in red.
- 3-level alarm thresholds are always displayed by 3-color bar graphic LED. Alarm1 threshold
in green, Alarm2 threshold in orange, and alarm3 threshold in red.
- When the detector is not connected or input current from the detector is under 10% below the
set high scale value, "Undr" displays and flashes at 1 sec interval.
- Trouble LED lights on, warning light flashes, and buzzer sounds.
- When "BZSTOP" S/W is pressed, warning light lights on and buzzer stops.
- When the input current from the detector is over 10% above the set high scale value, "oUEr"
displays and flashes at 1 sec interval.
- Alarm 1, 2, 3 LED lights flickers, warning light flickers, and buzzer sounds.
- Top circular LED of the 3-Color bar graphic LED lights on red.
- When gas concentration is detected to be above the set value for alarm, alarm function counts
the dwell time and if it is above the set dwell time, alarm function operates.
- Alarm relay turns on when it is above the alarm dwell time.
- When Alarm Latch Type is at "ON" mode and alarm function runs, the alarm status and gas
concentration value stays at the maximum value. When gas concentration decreases below
the alarm value, alarm does not get released and "RESET" S/W must be ran to release it.
- When Alarm Latch Type is OFF, Alarm is released automatically in accordance to gas
concentration.
■ Pressing "TEST" S/W for 2 sec or longer in gas concentration display mode enters Test mode.
■ In test mode, when it passes 30 min after the last S/W control, it automatically returns to the gas concentration
display mode.
6.3. Test Mode
- When it enters Test mode, gas concentration number displays and flickers.
- This function enables testing at channel unit without injecting gas to the detector sensor. It can
set an arbitrary concentration when the user presses "Test" S/W and alarm function operates
normally with a user-defined concentration.
- When "FUNC" S/W is pressed 2 sec or longer, it enters FND / LED / Bar LED Test function.
- 3-Color bar graph LED displays green, orange, and red at 0.5 s interval and each function
LED flickers at 0.5 s interval.
- When "RESET" S/W is pressed, it returns to gas concentration display mode.
▼ ▲
Full Range
■ Pressing "DOWN" S/W for 2 sec or longer in gas concentration display mode enters Stand-by mode.
■ PWhen ETO (Emergency Time Out) is set to ON in Option Setting Mode, it automatically returns to gas
concentration display mode after 30 min.
■ When ETO is OFF, "DOWN(Stand-by)" S/W must be pressed 2 sec or longer to return to gas concentration
display mode.
6.4. Stand-by Mode
- In stand-by mode, STD-BY LED flickers. Trouble/Alarm relay of GTC-520F contact output
does not operate but all other functions run.
- When "DOWN(Stand-by)" S/W is pressed 2 sec or longer, it returns to gas concentration
display mode
