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: Date Sheet File
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  • Industrial Gas Sensors
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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 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

0to 50

Storage temperature range

-40to 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)

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.

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