Non-dispersive Infrared Gas Sensors & Factors Affecting Life Expectancy
Non-dispersive infrared sensors accurately detect CO2 and refrigerant gases without cross interference from toxic or combustible gases because the absorption of the infrared light occurs at a wavel...
NDIR sensors consist of an infrared source, detector, optical filter, gas cell, and electronics for signal processing. When infrared radiation interacts with gas molecules, infrared light is absorbed by the gas molecules at a particular wavelength. Infrared light that is absorbed by the target gas passes through the active filter with a particular bandwidth for the detection of the target gas. The gas sensor detects the decrease in transmitted infrared light which is proportional to the gas concentration. Infrared light that does not interact with the target gas passes through the filter. Factors Affecting the Lifespan of Non-dispersive Infrared Sensors Continuous exposure to gas will not poison the sensor but it may require a long time to clear before accurate readings can be taken again.
- Do not use in locations where corrosive chemicals such as chlorine, ammonia and other oxidizers are present, especially if there is a higher humidity level.
- High humidity can affect response and promote corrosion.
- Water or vapour condensation can impair sensor performance.
- Dust and dirt can compromise sensor performance.
- Excessive vibration or impact can damage the sensor. In addition to the factors listed above, most sensors will suffer general wear and tear and it may not always be easy to detect the damage caused, making regular maintenance important to help keep the sensors in good working order.
Regular maintenance includes inspecting, cleaning if necessary, bump testing and calibration.