CDTHW : Carbon Dioxide (CO2) / Temperature / Humidity Transmitter

Model :CDTHW


Carbon Dioxide (CO2) / Temperature / Humidity Transmitter

Applications & Features:
  • CDTH series carbon dioxide ( CO2 ) / temperature /
    humidity transmitters are designed for monitoring &
    controlling indoor air quality, 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 the unit indicator( CDTHW ), display carbon
    dioxide ( CO2 ), temperature and humidity alternatively

Accuracy table for temperature/ humidity :

Outputs T (@10~40°C) RH (25°C,20~80%RH)
0~10V DC <±0.5° C 3%RH
4~20mA <±1.0°C 5%RH
RS485/ Modbus <±0.5°C 3%RH
RTD/thermistor See models See models

Additional information

Carbon dioxide (CO2 )


: NDIR sensor, with ABC algorithm*

Sampling Method

: diffusion


: (40+3%MV) ppm

Response time

: <10s (30cc/min, low airflow)


: <±10ppm/year


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


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


T- Sensor

: Digital, RTD or thermistor, see models

T- Range

: 0~50°C

T- Accuracy

: see accuracy table

T- Output

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

Relative Humidity

RH - Sensor

: Digital polymer

RH - Range

: 0~100%RH

RH - Accuracy

: see accuracy table

RH - Hysteresis

: <±1%RH

RH - Response time

: <10s (25°C, in slow air)

RH - Drift

: <±0.5%RH/year

RH - Output

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

RH - Power supply

: 16~28VAC/16-35VDC

RH - Load resistance

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


— Optional LCD Display (CDTHW)

D - Display resolution

: 1ppm, 0.1°C, 0.1%RH

D - Working environment

: 0~50°C, 0~95%RH (Non-cond.)

D - Temp. compensation

: 0~50°C

D - Storage temperature

: -20~60°C