What is the principle behind a temperature and humidity sensor?

Release Date:

2022-07-27

Author:

Principle Analysis: Temperature and humidity sensor It is a sensor that measures temperature and humidity. Typically, “humidity” refers to relative humidity—the ratio of the absolute humidity at the current temperature to the saturation humidity at that same temperature. As such, humidity measurement is inherently dependent on temperature; any error in temperature sensing will, in turn, affect humidity readings. Consequently, when selecting… Temperature and humidity sensor In such cases, particular attention should be paid to the temperature measurement accuracy of the sensor.

Regarding condensation: When relative humidity reaches 100%, condensation occurs; this is a natural phenomenon that cannot be prevented. However, the water droplets formed by condensation can adhere to the sensor’s circuit board. Since current flows through the board, electro‑osmosis may take place, leading to corrosion and eventual damage to the sensor. Therefore, in high‑humidity environments, it is essential to select a temperature‑and‑humidity sensor with waterproof capabilities. The testing method is straightforward: power on the sensor and immerse it in water to simulate a condensation‑prone environment. After 24 hours, remove the sensor and allow it to dry. If the sensor functions normally, it indicates that it is waterproof.

Regarding accuracy: Many people prefer using the psychrometric method to measure humidity, but in fact, psychrometers have relatively large errors—around 5–7% RH. With advances in electronic technology, electronic temperature‑humidity sensors can achieve an accuracy of 3% RH, and high‑precision models can even reach 1% RH.

Huizhou Jin Yuan Xiang Electronic Co., Ltd. is a high-tech enterprise that manufactures temperature and humidity sensors, which are widely used in environments such as hospital operating rooms and clean workshops.