CDWN/CDDN&CDWC Carbon Dioxide (CO2) Transmitter/Controller
Applications & Features
CD-N series carbon dioxide transmitters/controllers are designed for monitoring & controlling indoor air quality
CDWN/CDWC is suitable for wall mount and CDDN is suitable for duct mount
High performance NDIR digital sensor and circuit, ensure precise measurement and temperature compensation
Stable, reliable and fast response
15 years sensor life without maintenance
Digital technology applied, over voltage and reverse polarity protection, high reliability and anti-interference capability
All electrical terminals are on the inside bottom, avoid any possible destroy to PCB when wiring (for CDWN/CDWC)
Multiple outputs selection
LCD & function keys can set various parameters, calibrate and adjust output, so the product can be a stand-alone controller (for CDWC)
Specifications for CDWN (wall mount) &CDDN (Duct)
Sensor: NDIR sensor, with ABC algorithm
Sampling Method: diffusion
Accuracy: see models
Response time: ＜120s (30cc/min, low airflow)
Drift: ＜±10ppm/year
Range: 0~2000ppm (Measurement range 400~2000 ppm)
Output: 4~20mA, 0~10V, RS485/Modbus
Load resistance: ≤500Ω (Current output),
≥2kΩ (Voltage output)
Power supply: 16~28VAC/16~35VDC
Display: Optional LCD (CDWN), with unit display
Display resolution: 1ppm
Working environment: 0~50°C , 0~85%RH (Non-cond.)
Temp. Compensation: CDWN0/CDDN0:10~40°C
CDWN1/CDDN1:0~50°C
Storage temperature: -20~60°C
Housing: ABS+PC (CDWN), fireproof ABS (CDDN)
Protection: IP30 (CDWN), IP65 (CDDN)
Weight: 135g (CDWN), 230g (CDDN)
Approval: CE
ABC algorithm:
Automatic Baseline Correction, it constantly keeps track of the sensor's lowest reading over a few days interval and slowly corrects for any long term drift detected as compared to the expected fresh air value of 400 ppm CO2.
Models for CDWN&CDDN
Model 
CDWN
 
 
Wall mount CO2 
Transmitter 
Duct mount CO2 
Transmitter
Accuracy
CDDN
 
 
50 ppm + 5% reading 
40 ppm + 3% reading
Output
 
0
 
4~20mA & 0~10VDC 
4~20mA & 0~10VDC RS485/Modbus
1
Display (CDWN
 
 
0
N/A
LCD
1
 
Specifications for CDWC
Sensor: NDIR sensor, with ABC algorithm
Sampling Method: diffusion
Accuracy: see models Temp.
Compensation: CDWC0:10~40°C; CDWC1:0~50°C
Response time: ＜120s (30cc/min, low airflow)
Drift: ＜±10ppm/year
Range: 0~2000 ppm (measure range 400~2000ppm)
Output: 2×SPST, 3A-30VDC/250VAC
Communication: optional RS485/Modbus
Power supply: 16~28VAC/16-35VDC
Display and keys: with LCD Display and 3 touch keys, see more details on LCD & Keys operation Display resolution: 1ppm
Working environment: 0~50°C , 0~85%RH (Non-cond.)
Storage temperature: -20~60°C
Housing: ABS+PC
Protection: IP30
Weight: 135g
Approval: CE Models for CDWC
Model
CDWC
 
 
Wall mount CO2 Controller
Accuracy
 
0
 
50 ppm + 5% reading 
40 ppm + 3% reading
1
Communication
 
 
0
N/A
RS485/Modbus
1