What Is The Temperature And Humidity Sensor?
What is a temperature and humidity sensor?
What is a temperature and humidity sensor?
Temperature and humidity sensors (or temperature sensors) are devices that convert temperature and humidity into electrical signals that can easily measure temperature and humidity. The temperature and humidity transmitters on the market generally measure the temperature and relative humidity in the air, and convert them into electrical signals or other signals in the form of output to the instrument or software according to certain rules, to meet the needs of users’ environmental monitoring.
What is the principle of humidity sensor?
The components of the T/H sensor module mainly include humidity sensitive capacitance and conversion circuit. The wet-sensitive capacitor consists of a glass substrate, a lower electrode, a wet-sensitive material and an upper electrode. Humidity sensitive material is a kind of polymer whose dielectric constant varies with the relative humidity of the environment. When the ambient humidity changes, the capacitance of the humidity sensor will also change. That is, when the relative humidity increases, the humidity sensitive capacitance also increases, and vice versa. The sensor’s conversion circuit converts changes in the wet-sensitive capacitance to changes in voltage, corresponding to relative humidity changes from 0 to 100%RH.
How to choose the best temperature and humidity sensor for your project?
First of all, frequency response characteristics: the frequency response characteristics of temperature and humidity sensors determine the measured frequency range. Within the allowed frequency range, the measurement conditions shall not be distorted. In fact, the sensor response always has some delay. For the better. The frequency response of the sensor is high and the frequency range of the measurable signal is wide. Due to the influence of structural characteristics, the inertia of mechanical system is large. A low-frequency sensor has a lower frequency of measurable signal.
Secondly, linear range: the linear range of temperature and humidity device refers to the range of the output is proportional to the input. In theory, the sensitivity remains the same within this range. The wider the linear range of the sensor, the greater the measuring range, which can ensure a certain measurement accuracy. In the selection of sensor, in determining the type of sensor, the first thing to see whether its range meets the requirements.
Finally, stability: The ability of a temperature and humidity device to remain unchanged after a period of use is called stability. In addition to the structure of the sensor itself, the main factor affecting the long-term stability of the sensor is the use environment of the sensor. Before selecting a sensor, investigate its use environment and select an appropriate sensor according to the specific use environment.
JXCT Temperature and humidity sensor
Temperature and humidity sensors can be used for temperature and humidity detection in harsh environments such as industrial plants, traffic tunnels, energy, and electricity, as well as temperature and humidity detection in computer rooms and laboratories such as fruit trees, gardens, agricultural pastures, agricultural greenhouses, and flower breeding.
The temperature and humidity sensor adopts a high degree of protection enclosure, and the degree of protection is IP65. It can be used in outdoor or high dust occasions. High sensitivity, accurate measurement, no fear of condensation, strong anti-interference, stable performance.
