Industrial Gas Sensors - CRIR M1

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

¹ The 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.

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

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

⁴ The 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.

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

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