In the domestic market, there are many domestic and foreign humidity sensor products, capacitive moisture-sensitive components are more common, and the varieties of moisture sensing materials are mainly polymers, lithium chloride and metal oxides.
The advantages of capacitive moisture-sensitive components are fast response, small size, good linearity and stability, and some foreign products also have high-temperature operation performance. However, most of the products that achieve the above performance are foreign famous brands, and the prices are more expensive.
Some low-cost products of capacitive moisture-sensitive components sold on the market often fail to reach the above level, and the linearity, consistency and repeatability are not very ambitious, and the deformation of the wet-sensitive section below 30% RH and above 80% RH is serious.
Capacitive moisture-sensitive components also lack corrosion resistance, often have higher requirements for the cleanliness of the environment, and some products also have light failure, electrostatic failure and other phenomena, metal oxides are ceramic moisture resistors,
It has the same advantages as moisture-sensitive capacitors, but in the dust environment, the ceramic pores are blocked and the components will fail, and the method of electrifying and removing dust is often used to deal with it, but the effect is not ambitious, and it cannot be used in flammable and explosive environments.
Alumina moisture-sensing materials cannot overcome the shortcomings of "natural aging" of its surface structure, and the impedance is unstable, and metal oxygen ceramic moisture resistors also have the shortcomings of poor long-term stability. Some products use single-chip microcomputer to compensate and correct, so that the humidity presents a "step" jump.
The accuracy is reduced, and the shortcomings of poor consistency and linearity are presented.
Lithium chloride moisture resistor has the most outstanding advantage of being extremely stable for a long time, so after a strict process manufacturing, the appearance and sensor products made can reach high accuracy,
Strong stability means that the product has good linearity, precision and consistency, and is a reliable guarantee for long-term service life. The long-term stability of lithium chloride moisture-sensitive elements cannot be replaced by other moisture-sensing materials.
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