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GTD-5000F
Instruction Manual
7. System Mode
7. System Mode
- It is a mode that sets Dead band value for Alarm1 operation. Use " "UP key or DOWN key to set a value.
- When Alarm 1 is in "1H" mode, Alarm 1 operates at values above the sum of Alarm threshold and dead
band values and releases below dead band value subtracted from Alarm threshold.
- When Alarm 1 is in "1L" mode, Alarm 1 operation below dead band value subtracted from Alarm threshold
and releases above the sum of Alarm1 threshold and dead band value.
- When a desired Alarm1 dead band value is displayed, press "FUNC" KEY to set and enter the next item.
- This mode is to set a hysteresis value to remove a phenomenon where alarm1 warning runs on/off
repeatedly when the gas concentration reaches close to the set alarm1 threshold. Factory default is set to 0.
- Ex.) When threshold is 20% LEL/Dead band: 2% LEL, the alarm runs at 22% LEL and is released at 18%
LEL with 20% LEL as the reference.
- Alarm1 setting mode message displays "AL1T".
- It is a function to prevent instantaneous malfunction of gas detector due to external shock and noise other
than from normal operation and time can be set in a range between 0~30 sec.
- For Alarm1 dwell time setting, press UP key or DOWN key to increase or decrease in unit of sec, respectively.
- When a desired Alarm 1 dwell time is displayed, press "FUNC" KEY to set it and enter the next item.
- Ex.) Alarm threshold value: 20% LEL / Delay time: When it is at 5 sec, Alarm triggers when the measured
value is above the set value based on 20%LEL for 5 sec or longer. When it goes down below the set
value within 5 sec, alarm is not triggered.
- Alarm1 (Relay) contact output setting mode message displays "A1RL".
- It is a mode that sets alarm1 contact output. Pressing UP key or DOWN key changes "ON" and "OFF" mode.
- When a desired Alarm 1 contact output mode is displayed, press "FUNC" KEY to set it and enter the next
item.
- Alarm1 contact output mode has two modes; "On" and "Off". In "Off" mode alarm1 contact is not outputted
and in "On" mode, it is outputted.
- Alarm2 setting mode message displays "AL-2".
- It is a mode that sets Alarm2 Level threshold. It can be set in a range of 1~100% of set high scale value.
- Pressing UP key or DOWN key increases or decreases Alarm2 threshold, respectively.
- When a desired alarm 2 threshold is displayed, press “FUNC” KEY to set it and enter the next item.
- Alarm level is set to the concentration outlined in domestic regulations as factory setting.
- It is a mode to set a direction of Alarm 2 operation. Pressing "UP key or DOWN key displays "2H" or "2L",
respectively.
- "2H" sets the alarm to run at Alarm1 threshold or higher. "2L" mode runs at Alarm 2 threshold or lower.
- When a desired mode is displayed, press "FUNC" KEY to set and enter the next item.
- It is a mode that sets Dead band value for Alarm1 operation. Use UP key or DOWN key to set a value.
- When Alarm 2 is in "2H" mode, Alarm 2 operates at values above the sum of Alarm and dead band values
and releases below the sum.
- When Alarm 2 is in "2L" mode, Alarm 2 operation below dead band value subtracted from Alarm threshold
and releases above the sum of Alarm threshold and dead band value.
- When a desired Alarm2 dead band value is displayed, press "FUNC" KEY to set and enter the next item.
- This mode is to set a hysteresis value to remove a phenomenon where alarm2 warning runs ON/off
repeatedly when the gas concentration reaches close to the set alarm1 threshold. Factory default is set to 0.
- Ex.) When threshold is 20% LEL/Dead band: 2% LEL, the alarm runs at 22% LEL and is released at 18%
LEL with 20% LEL as the reference.
- Alarm2 setting mode message displays "AL2T".
- It is a function to prevent instantaneous malfunction of gas detector due to external shock and noise other
than from normal operation and time can be set in a range between 0~30 sec.
- For Alarm2 dwell time setting, press UP key or DOWN key to increase or decrease in unit of 1 sec, respectively.
- When a desired Alarm2 dwell time is displayed, press "FUNC" KEY to set it and enter the next item.
- Ex.) Alarm threshold value: 20% LEL / Delay time: When it is at 5 sec, Alarm triggers when the measured
value is above the set value based on 20%LEL for 5 sec or longer. When it goes down below the set
value within 5 sec, alarm is not triggered.
- Alarm2 (Relay) contact output setting mode message displays "A2RL".
- It is a mode that sets alarm1 contact output. Pressing UP key or DOWN key changes "ON" and "OFF" mode.
- When a desired Alarm2 contact output mode is displayed, press "FUNC" KEY to set it and enter the next
item.
- Alarm2 contact output mode has two modes; "On" and "Off". In "Off" mode alarm1 contact is not outputted
and in "On" mode, it is outputted.
- It means that it has completed setting and changing of the program mode. Pressing "FUNC" key changes
to menu mode.
