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4-6. How to detect
While the detector is operating in detection mode, put the tip of the taper nozzle close to the detection area
and draw sample.
The detector measures gas in the ppm range. If a gas is drawn, the detected gas concentration is
displayed with the bar meter on the LCD display.
• While conducting measurement in a manhole or confined space, do not lean over or look into
the manhole or closed space. It may lead to dangers because oxygen-deficient air or other
gases may blow out.
• Oxygen-deficient air or other gases may be discharged from the gas exhausting outlet of the
detector. Never inhale the air or gases.
• High-concentration (100% LEL or higher) combustible gases may be discharged from the gas
exhausting outlet of the detector. Never use fire near it.
• The detector is designed to draw gases around it under the atmospheric pressure. If excessive
pressure is applied to the gas inlet and outlet of the detector, detected gases may leak out from
its inside and may cause dangerous conditions. Be sure that excessive pressure is not applied
to the detector while used.
• When performing an air calibration, verify that you are in a fresh air environment before
starting. If interference gases or other gases exist, the adjustment cannot be performed
properly, thus leading to dangers when the gas leaks.
• Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based
on your judgment.
• Before use, check that there remains sufficient battery power. When the detector is not used for
a long period, the batteries may be exhausted. Never fail to replace them with new ones before
use.
• If a low battery alarm is triggered, gas detection cannot be conducted. If the alarm is triggered
during use, turn off the power and promptly replace the batteries in a safe area.
• Do not block the buzzer sound opening. No alarm sound can be heard.
• If the main unit is dropped or given a shock, the reading may rise and it may remain so. In such
a case, perform air calibration in a place where the surrounding air is fresh.
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