PRODUCT DATA
63-2615-07
C7632A,B
Sensor and Controller
CARBON DIOXIDE SENSOR
APPLICATION
The C7632 Sensor and Controller is a stand-alone carbon
dioxide (CO
2
) sensor for use in determining ventilation
necessity with heating ventilation and air conditioning
(HVAC) controllers. The C7632 measures the CO
2
concentration in the ventilated space or duct. The C7632 is
used in HVAC systems to control the amount of fresh
outdoor air supplied to maintain acceptable levels of CO
2
in
the space.
FEATURES
• Non-Dispersion-Infrared (NDIR) technology used to
measure carbon dioxide gas.
• Special plated sensor provides long-term calibration
stability.
• Device provides voltage output based on CO
2
levels.
• Used for CO
2
based ventilation control.
• Automatic Background Calibration (ABC) algorithm
based on long-term evaluation reduces required
typical zero-drift check maintenance.
• Fixed 0 to 10 Vdc from 0 to 2000 ppm. No
adjustments are necessary.
• Compatible with Honeywell Excel 10, 15, 5000, and
any controller requiring 0-10 Vdc input.
SPECIFICATIONS
Models:
C7632 Sensor and Controller. A stand-alone car-
bon dioxide (CO
2
) sensor with one 0-10 Vdc analog out-
put.
C7632A: Wall mount model.
C7632B: Duct mount model.
Dimensions:
C7632A: See Fig. 1.
C7632B: See Fig. 2.
Ambient Ratings:
Temperature:
Operating: +32°F to +122°F (0°C to +50°C).
Storage: -4°F to +158°F (-20°C to +70°C).
Relative Humidity (non-condensing): 0 to 95 percent.
Automatic Background Calibration (ABC) default:
On.
Electrical Ratings:
Power Supply: 24 Vac ±20%, 50/60 Hz (Class 2).
Maximum Power Consumption:
Average: 1W.
Peak: 2W.
Peak Current (at 20 ms): 300 mA.
Linear Analog Output: 0-10 Vdc.
Mounting:
C7632A: Vertical surface with standard single-gang junction
box.
C7632B: Sheet metal duct with a sampling tube.
CO
2
Pressure Dependence:
1.6% change in reading per
1 kPa deviation from 100 kPa.
Output:
Analog: 0-10 Vdc, 0-2000 ppm (fixed).
Sensor Performance Ratings:
Response Time: 1 min.
Carbon Dioxide Sensor:
Operation: Non-dispersive infrared (NDIR).
Sampling: Diffusion.
Range: 0 to 2000 ppm (fixed).
Annual Drift: ±10 ppm (nominal).
Accuracy: ±(30 ppm+2%) at normal temperature/pres-
sure.
Calibrated at the factory.
Uses automatic background calibration. No calibration
required for the life of the product.
Meets CEC Title 24 requirement of ±75ppm accuracy at
600ppm and 1000ppm ambient levels.
For proper CO2 operation, install only in spaces that see
at least 4 hours of continuous unoccupied time per
week.
C7632A
C7632B