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GTC-520A
Instruction Manual
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Check wire connections for operation power supply, with detection unit, between alarm unit and concentration display unit, etc.
■ Turn the power supply switch ON after checking input power supply
■ Check lighting of Power LED for alarm unit and concentration display unit.
■ Check display of "SELF" in FND of concentration display unit.
■ When "Test" S/W is pushed for more than 2 sec in the display state of gas concentration, Test mode is entered into.
■ When 30 min passes after the last S/W operation in Test mode, the display state of gas concentration is
automatically returned to.
6.1. Power ON
6.3. Test Mode
- Upon entering in Test mode, the figure for gas concentration display is displayed by blinking.
- This function allows testing in Channel Unit without gas injection in the detector sensor.
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When the user can set an arbitrary value for gas concentration by pushing "Test" S/W, while
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Alarm Function is normally operated with the concentration value designated by the user.
- When "FUNC" S/W is pushed for more than 2 sec, FND / LED / Bar LED Test function is entered into.
- 3 Color bar graph LED alternatingly displays green, orange and red at an interval of 0.5sec,
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each function LED blinks at an interval of 0.5 sec.
- When "RESET" S/W is pushed, the display state of gas concentration is returned to.
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Full Range
■ When "DOWN(Stand-by)" S/W is pushed for more than 2 sec in the display state of gas concentration, the checkup
mode is entered into.
■ When ETO (Emergency Time Out) was set for ON in Option Setting Mode and so min passes, the display state of
gas concentration is automatically returned to.
■ Upon ETO OFF, the display state of gas concentration is returned to only when "DOWN(Stand-by)" S/W is pushed
for more than 2 sec.
6.4. Checkup mode (Stand-by Mode)
- Function where STD-BY LED blinks, contact output f Trouble/Alarm relay for GTC-520A does
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not operate with all other functions operating in the checkup mode.
- When "DOWN(Stand-by)" S/W is pushed for more than 2 sec, the display state of gas
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concentration is returned to.
- When the power supply for GTC-520A is turned ON, the current Firm Ware Version is displayed.
- Figures are displayed after VER is displayed in FND for 0.5 sec.
- Current Version is 2.09.
- "SELF" blinks for about 30 sec in FND of concentration display unit, and it immediately becomes
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measuring state when Warming-up is finished.
- If abnormality occurs in the equipment or the detection unit at this time, breakdown alarm occurs.
■ If there is no abnormality in SELF TEST after Power On, the following state of gas measurement is automatically entered into.
6.2. Measuring Mode
- Gas concentrations received from the detector are displayed in FND digital display as figures.
- Gas concentration is displayed by 3 Color bar graphic LED and FND, in green when the
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concentration is less than the 1st Alarm, in orange when it is more than the 1st Alarm but less
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than the 2nd Alarm, and in red when it is more than the 2nd Alarm.
- When the detector is not connected or the current value inputted from the detector is inputted
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as a current value below the set High scale value by 10%, the text of "Undr" is displayed by
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blinking at an interval of 1 sec.
- Trouble LED is lighted, warning light blinks, and Buzzer sounds.
- When "BZSTOP" S/W is pushed, warning light is turned on and Buzzer stops.
- When the current value inputted from the detector is inputted as a current value more than the
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set High scale value by 10%, the text of "oUEr" is displayed by blinking at an interval of 1 sec.
- Alarm1,2,3 LED's are lighted, warning light blinks, and Buzzer sounds.
- Circular LED on the topmost among 3 Color bar graphic LED is lighted in red.
- When the gas concentration value is recognized as being higher than the Alarm setting value,
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the relevant Alarm function counts Alarm maintenance time and the Alarm function is operated
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if it is more than the Alarm maintenance time.
- Alarm relay is turned ON when it becomes more than the Alarm maintenance time.
- When Alarm Latch Type is in "ON" mode and Alarm function is operated, Alarm state and gas
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concentration value are maintained at the maximum value, Even when the gas concentration
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is lowered below the Alarm value, it is not cleared and must be cleared by "RESET" S/W.
- When Alarm Latch Type is in "OFF" mode, Alarm function is automatically cleared depending
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on the gas concentrations.
6. How to operate
6. How to operate
