IRC-AT CARBON DIOXIDE IRC-A C-AT DIOXIDE INFRARED SENSOR Thermopile Detector Technical Specification Figure 1 IRC-AT Schematic Diagram Top View Pin out details: 1. Lamp return 2. Lamp +5V 3. Not connected 4. Detector output. 5. Reference output 6. Thermistor output 7. OV supply Bottom View Side View Notes: 1. Dimensions without tolerances are nominal 2. Recommended PCB socket: Wearnes Cambion Ltd. code: 450-3326-01-06-00 3. Weight: 15g 4. Use antistatic precautions when handling 5. Do not cut pins 6. Do not solder directly to pins PERFORMANCE Maximum Power Requirements Minimum Operating Voltage Source Drive Frequency Active Output in N2 (peak-to-peak) Reference Output in N2 (peak-to-peak) Response Time (t90) Warm-up Time 5.0 VDC, 60 mA max. (50% duty cycle source drive) 2.0 VDC, 20 mA max. (50% duty cycle source drive) 3 Hz 4 to 7 mV @ 3 Hz, 50% duty cycle 2 to 5 mV @ 3 Hz, 50% duty cycle < 40 s @ 20°C ambient To final zero ± 100 ppm: < 30 s @ 20°C To specification: < 30 minutes @ 20°C LIFETIME MTBF KEY SPECIFICATIONS Temperature Signal Operating Temperature Range Storage Temperature Range Humidity Range Integral thermistor (NTC, R25 = 100KΩ B= 3940 K) -20°C to +50°C (linear compensation from 0 to 40°C) -40°C to +75°C 0 to 95% rh non-condensing Range (Application) Accuracy (%FS, using universal linearisation coefficients) Full Scale Resolution (ppm) Full Scale Repeatability (ppm) Span Universal Universal calibration lin. coeff. b lin. coeff. c conc. At the end of the product’s life, do not dispose of any electronic sensor, component or instrument in the domestic waste, but contact the instrument manufacturer, Alphasense or its distributor for disposal instructions. NOTE: all sensors are tested at ambient environmental conditions, with 47 ohm load resistor, unless otherwise stated. As applications of use are outside our control, the information provided is given without legal responsibility. Customers should test under their own conditions, to ensure that the sensors are suitable for their own requirements. Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UK Telephone: +44 (0) 1376 556 700 Fax: +44 (0) 1376 335 899 E-mail: [email protected] Website: www.alphasense.com

IRC-A Perf C-AT erformance Data IRC-AT Performance Data Figure 2 Beer Lambert Performance 0.16 Typical response from 0 to 5000ppm CO2. The fit is very close to the theoretical curve, predicted by the Beer-Lambert Law. 0.12 0.10 0.08 0.06 Model fit using standardised coefficients Custom linearisation is not necessary with the IRC-AT. Using universal linearisation constants, repeatability between cells is very good, allowing easy implementation. For an IAQ application, a zero and then single calibration at 4000ppm CO2 gives the error shown above: typically less than ± 40ppm from 0 to 4500ppm. Excellent...