The temperature and humidity sensor mostly uses the temperature and humidity integrated probe as the temperature measuring element, collects the temperature and humidity signals, and processes them through the circuits such as voltage stabilization filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse protection. After that, it is converted into a current signal or a voltage signal output that has a linear relationship with temperature and humidity, and can also be output directly through the main control chip such as 485 or 232 interface.
Temperature humidity sensor working principle
A temperature and humidity sensor is a sensor device equipped with humidity sensitive and thermal elements that can be used to measure temperature and humidity, some with on-site display, and some without on-site display. Temperature and humidity sensors are widely used in various fields of production and life due to their small size and stable performance.
Temperature and humidity sensor model type
1.Analog temperature and humidity sensor
The integrated temperature and humidity sensor uses a digital integrated sensor as a probe and a digital processing circuit to convert the temperature and relative humidity in the environment into a corresponding standard analog signal, 4-20mA, 0-5V or 0-10V . The temperature and humidity integrated analog sensor can convert the changes of temperature and humidity into changes of current/voltage values at the same time, and can be directly connected with various standard secondary instruments with analog input.
2. RS485 temperature and humidity sensor
The circuit adopts microprocessor chip and temperature sensor to ensure the reliability, stability and interchangeability of the product. The particle sintered probe sheath is adopted, and the probe is directly connected to the shell. The output signal type is RS485, which can reliably conduct distributed monitoring with the host computer system, and can communicate up to 2000 meters. The standard modbus protocol supports secondary development.
3. Network temperature and humidity sensor
The network temperature and humidity sensor can collect temperature and humidity data and upload it to the server through Ethernet/WiFi/GPRS. Make full use of the established communication network to realize long-distance data collection and transmission, and realize the centralized monitoring of temperature and humidity data. It can greatly reduce the amount of construction, improve construction efficiency and maintenance costs.
In what fields can temperature and humidity sensors be used?
With the rapid development of modern intelligence, sensors have become an inevitable configuration on all smart devices, and more temperature and humidity sensors have also been used in smart devices. So what smart areas can temperature and humidity sensors be applied to?
1. Temperature and humidity sensor applied in the central computer room
The humidity in the equipment room should also be ensured within an appropriate range. Because when the relative humidity in the air is too low, that is, when the air is too dry, the static voltage will increase significantly, which will seriously endanger the safety of equipment and staff; and when the humidity in the air is too high, the moisture will be very It is easy to form a water film on the surface of the device circuit, which shortens the service life of the device.
2. Temperature and humidity sensors used in smart agricultural monitoring
Temperature and humidity sensors promote the construction of “smart greenhouses”. So that the technicians can directly control the command at home through the computer or mobile phone. If it is found that the temperature has exceeded 35 degrees, the technician can turn on the fan in the shed by remote control. When the soil humidity is lower than 35%, spray irrigation and water replenishment are started immediately, so that the staff can control it at any time and anywhere. Use this greenhouse model to realize the remote management and control of the smart greenhouse.
3. Temperature and humidity sensors used in consumer electronics such as smart mobile
In the field of consumer electronics, temperature and humidity sensors are traditionally used in weather forecasting and indoor monitoring. The accuracy of temperature and humidity sensors used in consumer electronic products does not need to be very high, as long as 5% humidity accuracy and 0.5°C temperature accuracy can meet customer needs.
