Sensors operating on the NDIR principle have a detector that measures the intensity of infrared light of a specific wavelength absorbed by the surrounding air. This process takes place in the measuring chamber of the device, and this chamber must allow the infrared beam to freely reflect off the walls, i.e., the quality of the measuring chamber coating directly affects the accuracy and durability of the device.
Most sensors on the market use a multilayer gold coating, which has several drawbacks, such as aging, susceptibility to corrosion, and negative environmental impact during production. SenseAir offers a fundamentally new type of measuring chamber coating: multilayer EQC coating. Extensive experience in manufacturing sensors with various gold coating options allowed the company's engineers to create a coating that surpasses gold in many key parameters.
Advantages of EQC coating:
- Improved preservation during storage
- Less prone to aging (compared to gold coating)
- Allows expanding the sensor's application areas
- Reduces negative environmental impact
- Withstands corrosion gas and climate tests better than gold coating (when comparing IR signal degradation)
Why choose EQC coating?
Years of developing coatings suitable for high-precision, stable, and compact sensors led SenseAir to implement a new multilayer EQC coating in its devices. Compared to the old gold coating, the EQC coating allows expanding the operating conditions of S8 and K30 sensors, thereby broadening their application scope. For example, devices with EQC-coated sensors can be used in such applications:
Indoor swimming pools- Incubators
- Greenhouses
- Polluted environments
The diagram below shows that the EQC coating passed tests for IR signal degradation under the influence of corrosive gases and climatic conditions much better compared to several variants of standard gold coatings.
EQC coating tests
The coating successfully passed numerous extensive tests; samples of various configurations were exposed to ozone, hydrogen peroxide, and ammonia. The full list of tests includes:
- Accelerated climate test; temperature and humidity cycles
- Thermal shock tests
- Accelerated corrosion gas tests typical for polluted environments
- Hardness and adhesion tests
- Inspection with scanning electron microscope
- Infrared stereoscopy, 2 – 11 µm
- Alkali and acid tests
- Measurement of infrared signal indicators on synthetic (zero) gas
- Dust tests
- Chemical exposure tests in high humidity environments
CO2 concentration sensors with multilayer EQC coating can be found in the corresponding section of our catalog. For additional technical questions and purchasing inquiries, please contact our specialists
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