User Guide

PRODUCT DATA
C7262A Sensor and Controller
CARBON DIOXIDE/TEMPERATURE SENSOR
APPLICATION
The C7262 Sensor is a stand-alone carbon dioxide (CO
2
) and
temperature sensor for use in determining ventilation
necessity with HVAC controllers. The C7262 measures the
CO
2
concentration and temperature in the ventilated space.
The C7262 is used in ventilation and air conditioning systems
to control the amount of fresh outdoor air supplied to maintain
acceptable levels of CO
2
in the space and to sense the
temperature of the space.
FEATURES
•Used for CO
2
based ventilation control.
• Integral 20K ohm NTC temperature output.
• Models available with LCD that provides CO2 ppm level.
• Non-Dispersion-Infrared (NDIR) technology used to
measure carbon dioxide gas.
• Device provides voltage or current output based on CO
2
levels.
• Models available with SPST relay output.
• Automatic Background Calibration (ABC) algorithm based
on long-term evaluation reduces required typical zero-drift
check maintenance.
SPECIFICATIONS
Models: C7262 Sensor. A stand-alone carbon dioxide (CO
2
)
and temperature sensor with two jumper-adjustable CO
2
outputs (one analog and one SPST relay).
C7262A1008: Wall module with display.
C7262A1016: Wall module without display.
Dimensions: See Fig. 1.
Sensor Performance Ratings:
Response Time: Less than 3 min.
Carbon Dioxide Sensor:
Operation: Non-dispersive infrared (NDIR).
Sampling: Diffusion.
CO
2
Range: 0 to 2000 ppm
Accuracy: ± (30 ppm + 3% of reading) from 59°F to 85°F
(15°C to 30°C).*
Temperature Sensor:
Thermistor: 20K ohms NTC.
Operating temperature range: 22°F to 122°F
(-6°C to +50°C).
* This product complies with Title 24 Part 6, CEC Standard
for Residential and Non-Residential Buildings—2005,
when installed according to instructions.
Electrical Ratings:
Power Supply: 24 Vac/dc ±20%, 50/60 Hz (Class 2).
Maximum Power Consumption: 1W.
Peak Current (20 ms duration): At rated voltages it is 120mA
or less.
Relay:
Configuration: Shipped N.O.
Contact Rating: 1A at 50 Vac/24 Vdc.
Minimum Permissible Load: 1 mA at 5 Vdc.
Linear Analog Output:
Voltage: 0/2-10 Vdc (resistive load greater than
5000 ohms).
Current: 0/4-20 mA (resistive load less than 500 ohms).
Outputs (Jumper Adjustable, see Table 2):
CO2 outputs
C7262A1008 C7262A1016
62-0353-03