Model CDSN Carbon Dioxide Transmitter

NDIR CO2 Sensor, Universal Output, Passive Temperature

The Model CDSN Carbon Dioxide Transmitter accurately monitors the CO2 concentration and temperature in schools, office buildings, and other indoor environments to help achieve LEED® certification and energy savings. In order to achieve a higher level of accuracy, the Model CDSN includes digital barometric pressure adjustment. The CO2 universal output allows users to select the transmitter output to be 4-20 mA, 0-5 VDC, or 0-10 VDC to work with virtually any building management controller. In addition, the housing security feature reduces the likelihood of physical tampering.

California Residents: Click Here for Proposition 65 WARNING.

Product Applications

  • Demand control ventilation in schools
  • Indoor air quality monitoring in office buildings

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
Ships: Next Day
Price: $180.00
Carbon Dioxide/Temperature transmitter, wall mount, universal current/voltage output, 2000 PPM Next Day* $180.00 Order


NDIR, 15 year life expectancy.
0 to 2000 PPM.
±40 PPM +3% of reading*.
Response Time:
< 120 s (𝜏90).
Warm Up Time:
< 2 minutes operational; 10 minutes max accuracy.
Temperature Sensor Accuracy:
±1°C @ 25°C.**
Temperature Limits:
Operating: 32 to 122°F (0 to 50°C); Storage: -22 to 158°F (-30 to 70°C).
Humidity Limits:
0 to 85%, non-condensing.
Power Requirements:
24 VAC/VDC ± 20%, 50/60 Hz.
Output Signal:
Field selectable; Current: 4-20 mA or 0-20 mA; Voltage: 0-5 V, 1-5 V, 0-10 V, or 2-10 V.
Electrical Connection:
Screw terminals.
Enclosure Material:
Enclosure Rating:
NEMA 1 (IP30).
Agency Approvals:

*The specified CO2 accuracy is only guaranteed after three weeks of continuous operation in environments intermittently occupied.
**Included passive sensor: Sensor A - 10K Ω type 3 NTC thermistor; Sensor B - 10K Ω type 2 NTC thermistor; Sensor F - 20K Ω NTC thermistor.


  • Minimize inventory and save time by combining CO2 and temperature measurement, as well as DIP switch selectable current/voltage outputs
  • Integral passive temperature reduces the number of devices mounted in the space
  • Requires minimal maintenance with Automatic Baseline Correction (ABC) to account for sensor drift
  • Reduce operation costs using a low energy, reliable, and repeatable CO2 sensor
  • Simplify installation with backplate electrical connections

Product Literature


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Product Data Sheet




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