MSR MC2 CO2 Gas Sensor Transmitter

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In addition with MSR MC2 CO2 sensor element with infrared sensor there is a module integrated in the sensor unit with µController, analog output and power supply. The IR measurement principle with integrated temperature compensation ensures highest accuracy, selectivity and reliability despite the long calibration interval.

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In MSR MC2 CO2 the µController calculates a linear 4 – 20 mA (or 2 – 10 V) signal out of the measurement signal of the IR sensor and also stores all relevant measured values and data of the sensor element.

Calibration is done either by simply replacing the sensor unit or by using the comfortable, integrated calibration routine directly at the system.


The µGard®2 Sensor is used for the detection of CO2 leaks in dispensing and refrigeration systems etc.


  1. Digital measurement value processing incl. temperature compensation
  2. High accuracy, selectivity and reliability
  3. Low zero point drift
  4. Sensor life time > 15 years
  5. 4 – 20 mA (or 2 – 10 V) analog output with selectable signal output for special mode, fault etc.
  6. Reverse polarity protected, overload and short-circuit proof
  7. Integrated heating down to -35 °C
  8. Housing for integration of the sensor unit (option)
  9. IP 65 version

Additional information

Weight 1 kg


Gas Type

Carbon dioxide CO2

Sensor Element

Infrared (NDIR)

Measuring range / Resolution

5 vol. %

Measurement Interval

2 sec


< 10 % of reading

Response Time

t90 < 100 s

Sensor lifetime

15 years for normal operating environment

Calibration Interval

5 years

Temperature Range

-35 °C to +40 °C (-31 °F to 104 °F)

Humidity Range

0 – 95 % RH not-condensing

Pressure Range

Atmospheric ± 30 % (interference + 1,6 % on measured value per kPa)

Storage Temperature

5 °C to 30 °C (41 °F to 86 °F)

Storage Time

6 months

Protection class

IP 65


Screw mounting M25


(D x H) 24 x 22 mm (0.94 x 0.87 in.)

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MSR MC2 CO2 Gas Sensor Transmitter