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Industrial Gas Sensors - CRIR M1

? HVAC, demand controlled ventilation
? Indoor air quality (IAQ) measurement
? Air purification systems
? Smart /IoT (Internet of Things) systems

Model Number: CRIR M1
Data Sheet:

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Product Specification

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 sensor’s 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 range^{1, 2}	400 ppm to 2000 ppm, up to 10000 ppm extended range
Measurement interval	4 s
Accuracy³	±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)

¹The CRIR M1 is designed to measure CO2 in the range of 400 ppm to 2000 ppm with the accuracy specified in Table 1; however, exposure to concentrations below 400 ppm may result in incorrect operation of the ABC algorithm and should be avoided when the ABC is ON.

²The CO2 sensor provides readings via UART in the extended range; however, the accuracy is reduced.

³In normal IAQ applications, the sensor accuracy is defined after a minimum of three ABC periods of continuous operation.

⁴The sensor accuracy is specified over the operating temperature range and referenced to certified calibration mixtures. Uncertainty of calibration gas mixtures (±1% currently) is to be added to the specified accuracy for absolute measurements.

⁵See the CRIR M1 User Guide for Modbus address and parameter definitions.

⁶The CO2 sensor normally does not require maintenance in IAQ applications; however, for some industrial applications, maintenance may be required.

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