The characteristics and principle of humidity sensor element

by:Thermistor-Mov     2020-04-21
Moisture sensor is * simple humidity sensor. Moisture sensor mainly include resistive, capacitive two kinds big. The characteristics of the humidity sensitive resistor is in the substrate is covered a layer of membrane made with a sense of wet materials, when the water vapor in the air adsorption on feeling wet film, components of resistivity and resistance value changes, use this feature to measure the humidity. Humidity-sensitive capacitance is commonly made of polymer film capacitance, the commonly used polymer materials such as polystyrene, polyimide, butyric acid, acetic acid fiber. When the environment humidity change, humidity-sensitive capacitance of the dielectric constant change, make its capacitance also produces change, the capacitance variation is proportional to the relative humidity. Electronic moisture sensor accuracy can reach 2 - 3% RH, which is higher than wet and dry bulb humidity measurement accuracy. Moisture sensor linearity and stain resistance is poor, when testing environment humidity, moisture sensor to long-term exposure to the environment, under test is very easy to be polluted and affect the measuring accuracy and long-term stability of respect of customer: hello, our company is dedicated to provide users with high-quality products and complete solutions and the best technical services. The main products are pt100 temperature sensor, temperature sensor, humidity sensors, temperature transmitter, pressure sensor and so on. You can dial the hotline number service of the company over the web for more product details, perfect service is our constant pursuit of the United States, welcome new and old customers trust our products of choose and buy, we will serve you wholeheartedly.
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