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300N Series

Carbon Dioxide Analyzers
Range: 0 - 5,000 ppm
Models: CO2A320N - CO2A370N
Manufacturer: Nyad

Many gases, including CO2, absorb energy in the infrared band. This absorption is selective and occurs at specific frequencies corresponding to the resonant frequencies of bond vibrations within the molecule. Measuring a characteristic absorption enables the gas to be detected and the strength of the absorption gives a measure of the gas concentration. The CO2 sensor optics consist of an infrared source, sampling cell, infrared filter, and a detector. In addition, the sensor includes electronics to drive the source and to process the signals from the detector.

The infrared source is the hot filament of a tungsten lamp emitting a broad band of radiation. It then passes through the gas in the sample cell and then through a filter before reaching the detector. The filter selects out a very narrow bank of frequencies corresponding to a characteristic absorption band for CO2. The level of energy reaching the detector falls as the concentration of CO2 increases.

Features & Benefits

  • Microprocessor based conroller
  • Auto Calibration
  • Dual Adjustable Alarm Contacts
  • Operating Range: 0 to 5,000 ppm
  • Infrared Sensor
  • Large 4digit LCD Display
  • NonVolatile Data Memory
  • O.E.M. Packaging


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Nyad 300N - Carbon Dioxide Analyzers