top of page
Area CO2 +Temperature + Humidity Transmitter Model CDTH

Application and Features


  • CDTH series CO2/temperature/humidity transmitters are designed for monitoring & controlling indoor air quality (CO2), temperature and humidity in one unit

  • CDTHW is suitable for wall mount and CDTHD is suitable for duct mount

  • High  performance  NDIR  digital  sensor  and  circuit,  ensure precise measurement and temperature compensation

  • Multiple optional RTD or thermistor sensors, compatible with a variety of control systems

  • Stable, reliable and fast response

  • 15 years of CO2 sensor life without maintenance

  • All electrical terminals are on the inside bottom, avoid any possible destroy to PCB when wiring (CDTHW)

  • Digital technology applied, multiple outputs optional, over voltage and reverse polarity protection, high reliability and anti-interference capability

  • Large  LCD  with  unit  indicator  (CDTHW),  display  carbonm dioxide (CO2), temperature and humidity alternatively

Temp-Humid-Co2 Sensor.jpg



Carbon dioxide (CO2)

Sensor:                                NDIR sensor, with ABC algorithm*

Sampling Method:                diffusion

Accuracy:                            (40+3%MV) ppm

Response time(T90):           <120s (30cc/min, low airflow)

Drift:                                     <±10ppm/year

Range:                                 0~2000ppm (measure range 400~2000ppm)

Output:                                 4~20mA, 0~10V, RS485/Modbus


Sensor:                                Digital, RTD or thermistor, see models

Range:                                 0~50°C

Accuracy:                             see accuracy table

Output:                                 4~20mA, 0~10V, RS485/Modbus or RTD / thermistor


Relative Humidity Sensor:


Digital polymer Range:         0~100%RH

Accuracy:                             see accuracy table

Hysteresis:                           < ±1%RH

Response time:                    <10s (25°C, in slow air)

Drift:                                     <±0.5%RH/year

Output:                                 4~20mA, 0~10V, RS485/Modbus

Power supply:                      16~28VAC/16~35VDC

Load resistance:                   ≤500Ω (Current output), ≥2kΩ (Voltage output)

Display:                                Optional LCD Display (CDTHW)

Display resolution:                1ppm, 0.1°C, 0.1%RH

Working environment:           0~50°C, 0~95%RH (Non-cond.)

Temp. compensation:            0~50°C

Storage temperature:            -20~60°C

Housing material:                  fire retardant PC(UL94V-0)(CDTHW), fire retardant ABS 

                                              (UL94V-0) (CDTHD)

Protection:                             IP30 (CDTHW), IP65 (CDTHD)

Weight:                                  175g (CDTHW), 415g (CDTHD)

Approval:                               CE

PDF Download.jpg
bottom of page