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Operating Procedure
3. Operating Procedure (continued from previous page)
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Zero adjustment
To conduct zero calibration, press the AIRADJ. switch for approximately three seconds. The buzzer
will then beep once, followed by two beeps after a short pause. If zero calibration fails, the buzzer
will beep once followed by continuous beeps. This means that a gas in the air is affecting the Gas
Detector. In that case, conduct zero calibration in clean air. The sensor may not operate stably,
depending on the environment, or if the Gas Detector has not been used for a long time. If that
is the case, the gas concentration value will flash. If the value flashes, be sure to conduct zero
calibration, or the precise measurement of gas may not be possible.
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Oxygen Sensor Life Display
The E indication flashes as a preliminary announcement of the
oxygen sensor's life expiration. When E changes from flashing to
steady illumination, the life of the oxygen sensor is considered to
have expired. Refer to page 22 to replace the sensor unit.
If the Gas Detector is not turned on in clean air, E may be displayed
regardless of the lifetime condition of the sensor. Always turn ON the
Gas Detector in clean air.
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Range
To change the bar graph range, press the POWER switch while the gas concentration screen is
displayed. The range will be set to AUTO by default when the Gas Detector is turned ON. Each time
the POWER switch is pressed, the display will show the next range in the order of H, L, and AUTO.
Flashes
Press SYMBOL for
approximately 3 s.
Press SYMBOL for
approximately 3 s.
Completion of zero calibration
Press SYMBOL
Press SYMBOL.
