IAQ IAQ Setting
(Normal IAQ or Wide Range)
Operation Instructions
1. Power on and Measure:
Connect a PC power or adapter within the USB cable to start up the device. The LCD will display “---” during warm-up.
After warm-up, the LCD shows the CO2concentration for Main Display.
2. Automatic Background Calibration:
“OFF” is the default.
2.1 Press Mode Key(○
2) for more than 3 sec. to show ” A on/A oFF ”, then press Select Key (○
3) for ON/OFF.
2.2 ON: Turn on automatic background calibration to calibrate the sensor every 24- hour per day.
2.3 OFF: Turn off automatic background calibration.
Note: Automatic background calibration should be used in a well-ventilated environment. It is not recommended to use
the function in a greenhouse, wine cellar, narrow or poorly ventilate space, otherwise it will affect the accuracy.
3. Buzzer ON/OFF：
“ON“ is the default.
3.1 Press Mode Key(○
2) for more than 3 sec. to show “A on/A oFF”, then press Mode Key(○
2) to show “b on”.
3.2 Press Select Key (○
3) for ON/ OFF(b on/b oFF).
4. Auto-Switch Display (option)：
“OFF“ is the default. If select “ON”, the CO2 / Relative Humidity / Temperature readings will be displayed in sequence.
4.1 Press Mode Key(○
2) for more than 3 sec. to show “A on/A oFF “, then press Mode Key(○
2) to show “b on”, press Mode Key(○
2)
again to show “S oFF ”.
4.2 Press Select Key (○
3) for ON/OFF(S on/S oFF).
4.3 When the LCD shows the ambient temperature and relative humidity readings, the LED with CO2concentration will be lit off
automatically.
5. Manually Display Temperature and Relative Humidity (option)：
5.1 Short press Mode Key(○
2) to show relative humidity.
5.2 Then short press Mode Key(○
2) again to show ambient temperature.
6. IAQ Setting:
“OFF“ is the default, whose LED light is white. Please select the “Normal IAQ” or “Wide Range” setting.
6.1 Press Mode Key(○
2) for more than 3 sec. to show “A on/A oFF “, then press Mode Key(○
2) to show “b on”, press Mode Key(○
2)
again to show “S oFF”, and then press Mode Key(○
2) to show “I on/--”.
6.2 Press Select Key (○
3) for “I on” / “I --”.
6.3 I on : 800~1,400ppm for “Normal IAQ” setting with 800ppm(Green LED light)~1,400ppm(Red LED light).
6.4 I - - : 800~3,000ppm for “Wide Range” with 800ppm (Green LED light)~3,000ppm(Red LED light).
7. Switch°C/°F(option)：
On main screen, short press Select Key (○
3) to show°C/°F.
8. Outside calibration and clear
8.1 Outside calibration
(1) Calibrate the device under 400ppm CO2concentration in outdoor environment.
(2) Press and hold Mode Key (○
2), then press Select Key (○
3) for more than 3 sec. to show “CAL”.
(3) Press Select Key (○
3) for 600 sec. to start the countdown for calibration, and then return back to the main screen automatically.
