What are the advantages and disadvantages of infrared gas detectors?
Infrared gas detector, known as infrared optical gas detector, it is a kind of according to Lambert - Beer (Lambert-Beer) law principle to work, based on different gas molecules of the near-infrared spectral selection of the absorption characteristics of the gas concentration and absorption attenuation of the intensity of the relationship between the gas concentration and the intensity of the (Lambert - Beer's law) to identify the composition of gas concentrations
Infrared gas detector specific workflow: the gas to be measured continuously through a certain length and volume of the container, the molecules composed of different atoms will have a unique vibration, rotation frequency, when the infrared gas detector sensing wavelengths and the measured gas absorption spectral lines coincide with the occurrence of infrared energy absorption, thus causing changes in infrared light intensity, infrared light through the measured gas light intensity attenuation to meet the Lambert-Beer (Lambert-Beer) law. Beer (Lambert-Beer) law, the greater the gas concentration, the greater the attenuation of light. The greater the gas concentration, the greater the attenuation of light. In this case, it is only necessary to measure the change in the intensity of infrared attenuation to measure the gas concentration.
Advantages and disadvantages
Advantages of infrared gas detector: lies in the long service life (5 years life), high sensitivity, good stability, and non-toxic, less interference by the ambient temperature and humidity, not dependent on oxygen and other characteristics. The infrared gas detector can accurately distinguish the micro-content PPB level gas or PPM level gas, and the accuracy is up to 1% or less. At present, infrared gas detector is widely used in scientific research and experimental gas analysis, hazardous chemical gas leakage detection, plant boundary safety inspection, air pollution detection and other scenarios.
Infrared gas detector disadvantages: the principle of the technology is a little expensive, relative to conventional electrochemical, semiconductor, catalytic combustion gas detector principle is much more expensive. So the budget is not high partners, in addition to PID, infrared, can only consider choosing other conventional detection principle.
Infrared gas detector suitable for measuring which gas?
Infrared gas detector is suitable for measuring most combustible gases, such as measuring high concentrations of methane, ethanol, propane, ethane, cyclohexane, hexahydrobenzene, cyclopentane, propylene, acrylonitrile, carbon dioxide, nitrogen dioxide, sulphur hexafluoride, carbon monoxide, sulphur dioxide, ammonia, nitrous oxide, n-ethylene, n-pentane, valeric acid, isobutyl alcohol, bromoform and other gases. In addition, the infrared gas detector is also suitable for measuring most volatile organic gases, such as TVOC, VOCs, VOC, toluene, xylene and other gases.
