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    CO Concentration Ul2034 CO Detectors Sensorcon CO Inspector

    0-30ppm

    Nothing happens from 0-30ppm.

    Instant readout on LCD display in 1ppm increments.

    30-70ppm

    Probably nothing At 30ppm+. Though there is a small chance that it will alarm but not for at least 30 days! Please consult the UL2034 standard which states that the device is not supposed to alarm for at least 30 days at 30ppm. This means it might not ever alarm until it's next threshold of 70ppm.

    Instant readout on LCD display in 1ppm increments. LED and audible first alarm starts instantly at 35ppm+. This corresponds to the 8 hour time weighted average (TWA) set by the National Institute for Occupational Safety and Health (NIOSH)

    70-150ppm

    At 70+ppm the alarm is supposed to start in 60-240 minutes.

    Instant numerical readout and
    alarms active.

    150-400ppm

    At 150+ppm the alarm is supposed to start in 10-50 minutes.

    Instant numerical readout, alarms active, higher alarm starts at 200ppm, which corresponds to the 15 minute ceiling set by NIOSH. Ceiling means this is the maximum workers should be exposed to for any period of time.
    400ppm+

    At 400+ppm the alarm is supposed to start in 4-15 minutes.

    Instant numerical readout = high alarms active