DESCRIPTION
The CRIR M1 Commercial Carbon Dioxide (CO2) sensor is a single channel, non-dispersive infrared (NDIR) sensor. Within the CRIR M1 is a sensing chamber with an infrared source at one end and a detector fitted with an optical filter at the other end. The source emits radiation at wavelengths which include the absorption band of CO2. The filter blocks wavelengths which are not sensitive to the presence of CO2, thereby increasing selectivity and sensitivity. As the light passes through the sensing chamber, a fraction is absorbed if CO2 is present. The difference between the light emitted by the source and received by the detector can then be converted to a CO2 concentration reading.
The Automatic Baseline Correction (ABC) function can automatically calibrate the sensors lowest reading over a pre-configured interval to 400 ppm CO2. This enhances long term stability and may eliminate the need for calibration.
FEATURES
Single channel, non-dispersive infrared technology
Automatic Baseline Correction
Temperature compensation
UART digital interface
VALUE TO CUSTOMERS
Small size
Maintenance free for normal indoor applications
Enhanced long term stability
Higher accuracy: ±40 ppm ±3% of reading
Consistency and repeatability
Easy integration
POTENTIAL APPLICATIONS
HVAC, demand controlled ventilation
Indoor air quality (IAQ) measurement
Air purification systems
Smart /IoT (Internet of Things) systems
SPECIFICATIONS
CHARACTERISTIC |
PARAMETER |
Target gas | carbon dioxide (CO2) |
Operating principle | non-dispersive infrared (NDIR) |
Standard range1, 2 | 400 ppm to 2000 ppm, up to 10000 ppm extended range |
Measurement interval | 4 s |
Accuracy 3 | ±40 ppm ±3% of reading |
Typical response time (T90) | 120 s |
Sensor warm-up time | 3 min typical |
Repeatability | >97% |
Operating voltage | 4.5 V to 5.5 V unprotected against surges and reverse connection |
Power consumption | 300 mA peak, 30 mA average |
Alarm output, open collector |
1000 ppm/800 ppm normal state is conducting max 100 mA. Transistor open at CO2 high or at sensor failure (see Figure 1) |
Serial communication5 | UART, Modbus protocol |
Operating temperature range | 0 to 50 |
Storage temperature range | -40 to 70 |
Operating humidity | 0 %RH to 90 %RH non-condensed |
Expected operating life | 10 years |
Maintenance6 | maintenance-free for normal indoor applications |
Weight | <8g |
Dimensions | 33 mm x 22 mm X 11,2 mm (tolerance ±0,5 mm) |
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