CO2 Sensor, w/display

Carbon monoxide detector, wall mount, w/display

Item Number: 14905

The CO2 sensor represents a wall mount carbon dioxide, humidity and temperature transmitter with display and active humidity and temperature outputs. It provides controlled ventilation with easy installation and a clean, modern look that suits most indoor environments.

The sensor is used mainly for demand-controlled ventilation to prevent energy losses from over-ventilation while maintaining indoor air quality, such as a conference room, classrooms, gyms and fitness centers.


Sensing Method

Non-dispersive infrared (NDIR)


Sensing Element

Capacitive polymer sensor


CO2 Measurement Range

0 to 2000 ppm (0 ppm = 0 V, 4 mA; 2000 ppm = 10/5V, 20 mA)


CO2 Accuracy Single Channel

400-1250 ppm ±30 ppm or 3% of reading (whichever is greater)

1250-5000 ppm ±5% of reading + 30ppm

*Tolerance based on span gas of ±2%


Power Supply Requirements

18-30V AC RMS, 50/60 Hz


Power Consumption

0.7 W at nominal voltage of 24V AC


Temperature Dependence

±0.11% per °F (0.2% FS per °C)


Flammability Classification

UL94 5VA


RH Range

0% to 99% RH (non-condensing)


RH Accuracy at 77°F (25°C)

±2.5% RH (20 to 80% RH)

±3.5% RH (80% RH)


Active Temperature Accuracy

±0.8°C at 72°F (22°C)

Active Temperature Range

32°F to 122°F (0°C to 50°C)


ABC Logic™ Self Calibration System

ABC Logic™ (Automatic Background Calibration) self-calibration allows the sensor to continually recalibrate itself when the indoor concentrations drop to outside levels while the building is unoccupied. Generally, a building must be regularly unoccupied for 4 hours or more for this self-calibration system to operate properly. Under these conditions, ABC Logic™ should maintain sensor calibration over the lifetime of the sensor. The ABC Logic™ should be turned OFF where a building is continuously occupied 24 hours per day, or where there could be significant sources of non-occupant related CO2 such as greenhouses, breweries and other industrial and food processing applications.


Output Analog

0 to 5 V, (100 Ω output impedance)

0 to 10 V (100 Ω output impedance)

4 to 20mA (RL maximum 500 Ω) available simultaneously for CO2 output

Digital to analog error ±1%



Technical parameters

Norminal data
Voltage (nominal) 24 V
Frequency 50; 60 Hz
Input power 1 W
Enclosure class IP50
Controller and Sensors
Permitted humidity, non-condensing 0 to 99 %RH
Permitted ambient temperature 32 to 122 °F
Working range 2000,000000
Dimensions and weights
Weight 0.4 lb