UK Clairair Infrared CO2 Sensor CO2 Sensor - Cirius2

Cirius2 Infrared CO2 Sensor CO2 Sensor Introduction and Operation
The Cirius series sensors use non-dispersive infrared technology to detect the presence of gases. The sensor includes an infrared source, a dual-element infrared detector, and a unique light guide for gas diffusion. The dual-element detector responds to changes in incident light, and to operate the sensor, the infrared source is typically driven at 2Hz to 4Hz with a 50% duty cycle. The sensor then produces active and reference wavelength outputs; if target gas is present, it changes the active wavelength but not the reference wavelength. These outputs consist of small AC signals synchronized with the source pulse, superimposed on a DC blanking level. The sensor also provides a means of measuring internal temperature via an embedded thermistor. The sensor requires power for the infrared detector, and its external connections conform to the industry-standard 7-pin configuration.

To operate the sensor, it must be connected to a suitable circuit that provides source driving and can extract the small AC signals from the DC blanking level. This circuit must amplify the small AC signals, extract a value from them, and process the result to provide a linear output related to gas concentration. For more comprehensive performance specifications, the sensor's temperature output should be used for temperature compensation. Clairair Limited can provide technical support regarding implementation and application notes.

Cirius2 Infrared CO2 Sensor CO2 SensorFeatures
• MEMS detector
• Typical detection range: 0-5000ppm CO2 to 0-5% vol CO2
• Absolute limit range: 0-2000ppm CO2 to 0-10% vol CO2
• All-metal construction
• Patented sensor design
• Small internal volume
• Low power consumption
• Active and reference signal outputs
• Embedded thermistor temperature sensor output
• Wide operating temperature range
• Fast response
• Patent number GB2449433
• Poisoning resistant
• Fail-safe operation
• Electrically isolated housing

Cirius2 Infrared CO2 Sensor CO2 SensorSpecifications:
• Power consumption: 150mW typical
• Response time (T90): <30S
• Supply voltage: 5V
• Ambient temperature: -40~80 ℃
• Relative humidity: 0 - 95% RH non-condensing
• Operating temperature range: -30°C ~ +60°C
• Operating pressure range: 700 - 1300 hPa
• Supply voltage: 2.8V - 5.5V