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General Data |
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Power supply | 24VAC/VDC± 10% | |
Consumption | 3.5 W max. ; 2.0 W avg. | |
Analog outputs | One 0~10VDC/4~20mA for CO2 measurement Two 0~10VDC/4~20mA for CO2/Temperature measurements PID control output is selectable | |
Relay output | One passive relay output (max.5A) with the control mode selection (control a fan or a CO2 generator) | |
RS485 interface | Modbus protocol or BACnet protocol, 4800/9600(default)/19200/38400bps; 15KV antistatic protection, independent base address. | |
LED light selectable | 3-color mode (default) Green: ≤1000ppm Orange: 1000~1400ppm Red: >1400ppm Red flashing: CO2 sensor faulty | Working light mode Green on: working Red flashing: CO2 sensor faulty
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OLED Display | Display CO2 or CO2/temp. or CO2/Temp./ RH measurements | |
Operation condition | 0~50℃; 0~95%RH, non condensing | |
Storage condition | -10~60℃, 0~80%RH | |
Net Weight / Dimensions | 190g /117mm(H)×95mm(W)×36mm(D) | |
Installation | wall mounting with 65mm×65mm or 2”×4”wire box | |
Housing and IP class | PC/ABS fireproof plastic material, protection class: IP30 | |
Standard | CE approval | |
Carbon Dioxide |
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Sensing element | Non-Dispersive Infrared Detector (NDIR) | |
CO2 measuring range | 0~5000ppm (selected in the advanced setup) | |
CO2 Accuracy | ±60ppm + 3% of reading or ±75ppm (whichever is greater) | |
Temperature dependence | 0.2% FS per℃ | |
Stability | <2% of FS over life of sensor (10 year typical) | |
Pressure dependence | 0.13% of reading per mm Hg | |
Calibration | ABC Logic Self Calibration Algorithm | |
Response time | <2 minutes for 90% step change typical | |
Signal update | Every 2 seconds | |
Warm-up time | 2 hours (first time) / 2 minutes (operation) | |
Temperature and RH (option) | ||
Temperature sensor (selectable) | Digital integrated temperature and humidity sensor SHT, or NTC thermistor | |
Measuring range | -20~60℃/-4~140F (default) 0~100%RH | |
Accuracy | Temp.: <±0.5℃@25℃ RH: <±3.0%RH (20%~80%RH) | |







Tongdy Sensing, located in Beijing Zhongguancun Environmental Science and Technology Park, which is the leader of air quality detection.Tongdy has been always focusing on its strong technology development and design capabilities, constantly providing high quality products for air quality monitoring and control.
Tongdy has its own R&D office building and massive investments in R&D facilities like aging and testing laboratories and professional calibration chambers provide the necessary conditions for its continuous R&D and stable development. Tongdy’s products include: Carbon dioxide, carbon monoxide, ozone, TVOC, PM2.5/PM10, formaldehyde and other gas monitors/controllers; indoor air quality/in-duct air quality/outdoor air environment monitors, data collection and analysis.
These products have been widely used in thousands of projects in Europe, North America, the Gulf region and the Asia-Pacific region for over 15 years, and accumulating long-term application data and experience in different environment.
Tongdy has excellent reputation and popularity in the HVAC and green building industries.




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