CO2 sensor
Carrier Sensors 29
Part #33ZCSENCO2
Wall-mount or duct-mount
Duct installation requires an Aspirator Box (Part #33ZCASPCO2) to house the CO
2
sensor.
A CO
2
sensor monitors carbon dioxide levels. As CO
2
levels increase, the controller adjusts the outside air
dampers to increase ventilation and improve indoor air quality.
3.25 in.
(8.3 cm)
5.25 in.
(13.3 cm)
1.125 in.
(2.9 cm)
Side view
0.25 in.
(0.6 cm)
5 in.
The figure below shows ventilation rates for various CO
2
setpoints when outside air with a typical CO
2
level of
350 ppm is used.
20 CFM/person
5 CFM/person
500 700 900 1 100 1300 1500 1700 1900 2100 2300 2500
80
60
40
20
0
CO
2
Concentration (PPM)
Airflow per person
Outside air (CFM)
NOTES
• The sensor has a 4–20 mA output that is converted to 0–5 Vdc by a 250 Ohm, 1/4 watt, 2% tolerance
resistor connected across the zone controller's CO
2
input terminals.
• Do not use a relative humidity sensor and CO
2
sensor on the same zone controller.
To Next Page
Loading...
