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2. Operations
CO2 measurement
Long press
to turn on the meter. It takes 120s to stabilize CO2 concentration. CO2
concentration, ambient temperature, relative humidity will be displayed on the screen. CO2
concentration value is refreshed every 3 seconds.
Note: if CO2>1000ppm, buzzer goes off with red backlight flashing. The audio alarm's default
setting is OFF, long press
1)
Concentration grading emoticons
400ppm ~ 450ppm
450ppm ~ 700ppm
700ppm ~ 1000ppm
1000ppm ~ 2000ppm
2000ppm ~ 5000ppm
>5000ppm
Data
Short press MODE to cycle switch between HOLD/MAX/MIN/AVG/TWA/STEL values.
Symbol
HOLD
MAX
MIN
AVG
TWA
STEL
TWA: The average exposure within the workplace to any hazardous contaminant or agent using
the baseline of an 8 hour day or 40 hours week work schedule.
STEL: The acceptable exposure limit to a toxic or irritant substance over a short period of time
(time-weighted average), usually 15 minutes.
Auto shutdown
The meter will automatically shut down if there is no operation for 2 hours.
Backlight
Please refer to Operation Instructions-Functional Buttons
Audio alarm
Please refer to Operation Instructions-Functional Buttons
Temperature unit
Please refer to Operation Instructions-Functional Buttons
to turn on the audio alarm.
Short-term exposure limit
Indication
Data hold
Maximum value
Minimum value
Average value
Time weighted average
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