Air Quality CO2 Monitor
DT-326
1. Description
The Carbon Dioxide (CO
2
) Monitor is designed for air quality control and health
control by measuring Carbon Dioxide (CO
2
) level in areas where it needs to be
monitored, such as factories, schools, offices, transportation lines and so on.The
measured CO
2
value in ppm (parts-per-million) will be displayed on the LCD with
three acoustic alarm sounds when then CO
2
level is exceeding the define level.
2. Feature
• NDIR (non-dispersive infrared) CO
2
sensor
• Checks for Carbon Dioxide (CO
2
) concentrations
• Indoor Air Quality displayed in ppm with Good (0 to 800ppm), Normal (800
to1500ppm), Poor (>1500ppm) indication
• Easy to read, large dual display
• Simultaneously displays (CO
2
) concentrations
，
Air Temperature and Humidity
• Adjustable carbon dioxide refresh frequency.
• Adjustable carbon dioxide alarm function in the range of 0-5000 ppm.
• Air quality indicator function.
• low battery indication.
3. Specifications
Range
Accuracy
Resolution
CO
2
0 to 5000ppm ±75 ppm ±5% of reading
1 ppm
Temperature
-10 to 50
o
C
±1
o
C
0.1
o
C/
o
F
Humidity
0 to 100 %RH
±3.5 %RH (20%RH-80%RH)
±5%RH (0%RH-20%RH/
80%RH-100%RH)
0.1 %RH
Power supply
1.5V AA Battery * 2
Charging
Micro USB DC 5V 1A
Working temperature -10 to 50
o
C
Storage temperature -10 to 60
o
C
4.Names and function of parts LCD display
1. LCD
2. °C/°F Switch Function Button (UP Button)
3. Power Button
4. SET Button(UP Button)
5. Instrument Hang Buckle Point
6. CO
2
sensor
7. Temperature and humidity sensor
8. Battery Cover
9. Power supply Micro USB DC 5V 1A
5. LCD Introduction (Below is the Picture of LCD)
1. CO
2
display value
2. Temperature display value
3. Humidity display value
4. Battery power icon
5. Temperature unit : Celsius
and Fahrenheit
6. Humidity unit : %RH
7. CO
2
unit : PPM
8. Color screen printing and air
quality indication
9. Temperature icon
10.Humidity icon
6. Operation Instructions
Key function
In the measurement mode:
Press the °C/°F switch function button briefly will switch between Celsius and
Fahrenheit;
Press the SET button briefly to enter the setting mode;
Long press the power button to shut down;
In the setting mode:
Press the °C/°F switch function button briefly to increase the corresponding
(flashing) value;
Press the SET button briefly to decrease the corresponding (flashing) value;
Press the power button briefly to switch between alarm value setting and CO
2
refresh frequency setting;
Long press the SET button to save the set value and exit the setup mode;
Long press the power button to shut down.
·Start measuring
Install 2 x AA 1.5V batteries; Power supply Micro USB DC 5V 1A.
Press the power button to start the instrument;
After starting up,CO
2
updates the data according to the set frequency;
The temperature and humidity update the real-time data once every second;
Air environment indication function:
Range(PPM)
Grid
Color
Grade
<800
1
GOOD
800~1500
2
NORMAL
>1500
3
POOR
The analog bar in the middle of the liquid crystal will indicate the current
environmental quality according to the CO
2
concentration.
Setting mode
Alarm value setting mode
After entering the setting mode, the alarm value setting mode will be entered
firstly
；
Alarm value setting: PPM is displayed, CO
2
value flashes, and alarm value unit is
ppm. When press the “
▲
” or “
▼
” button , the alarm value will be increase by
10ppm or decrease by 10ppm.the default value is 1500;
Alarm value setting mode diagram is as follows:
CO
2
sampling frequency setting mode
In the alarm value mode,press the power button briefly to enter CO
2
sampling
frequency setting mode.
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