Background calibration
Calibrate the sensor while the reading deviates from the actual gas
concentration.
Change calibration and ABC setting
parameter.
Automatic background calibration
Operation Instructions
1. Power on and Measure:
Connect the USB cable to a PC ora USB towall adapter to power on the device. After powered on, the bars on the LCD will decrease by degrees
during warm-up. The device will start to measure CO2 concentration, ambient temperature and relative humidity after warm-up.
2. Backlight Display Mode:
"Auto"auto backlight isthe default mode. Press Mode key (○2 ) to display the current back-light mode and then press Mode key (○2 )to select
setting modes in sequence: Auto AL on OFF. After selecting the mode, itisthe confirmation mode. You do not need to press any key to
confirm it.
2.1 Auto: The backlight color varies with the CO2concentration. <800ppm isgreen, good status;950ppm~1,400ppm isyellow, okay status,
>1400ppm isred, poor status – requires ventilation.
2.2 AL: The alarm level isexceeded and the backlight isdisplayed in red. The default alarm level is1,400ppm. Please follow the alarm level setting
method to adjust the alarm level.
2.3 on: The LCD backlight is always on. It is only LCD backlight, without any prompt function. The backlight color depends on the color you select.
(please see the setting of COL).
2.4 OFF: Turn off all backlight functions.
3. Setting:
Press and hold Mode key (○
2) to enter the settings. And then press Mode key (○
2) to select setting modes in sequence: COL (LCD backlight color)
AL (alarm level setting) Real-time ECO (energy-saving mode). Press Select key (○
3) to adjust the parameters.
3.1 COL: The default LCD backlight color is white. A total of 7 colors are optional. The color order is white turquoise blue purple red
yellow green. (Figure 1)
3.2 AL: The default alarm setting is 1,400ppm. The alarm value can be adjusted from 400ppm to 3,000ppm (the interval is 100ppm). (Figure 2)
3.3 Real-time:
3.3.1 Set “12 Hour (AM/PM)/24 Hour” by pressing Select key (○
3).
3.3.2 The default real-time setting is 0:00(24 Hour Clock). The setting sequence is hour minute. After setting "hour", press Mode key (○
2) to
set "minute" (the interval is 1 hour / 1 minute) (Figure 3). Press Select key (○
3) to adjust the parameters. Press and hold Select key (○
3)
to quickly set the parameters.
3.4 ECO: The default ECO setting is “OFF’. Press Select key (○
3) to select “on’. After ECO mode is turned on, the LCD backlight will be dark
during the period from 22:00 pm to 6:00am for saving power. (Figure 4)
(Figure 1) (Figure 2) (Figure 3) (Figure 4)
Note: During the setting process, the device will return to the main screen after 20 sec of idle time.
4. °C/°F switch: Press and holdSelect key (+)to switch °C/°F.
5. Calibration
4
1. Plug in and power your device outside.
***Note: Do not breathe directly on your device during the calibration process.
***Note: Do not place the device in direct sunlight.
2. Allow your device to sit outside for 3 - 5 minutes to allow CO2 levels to adjust appropriately.
3. Press and hold the Mode key (MODE) and then press Select key (+) together. When the CO2 calibration value flashes on the LCD, it means
that the calibration mode has been entered.
