Talking about the development history and function of temperature and humidity sensor
Development of temperature and humidity sensors As early as 1593, Italian scientist Galileo invented thermometers for people to measure temperature. Until 1821, the German physicist Seebeck discovered the Seebeck effect that turns temperature into an electrical signal and made a thermocouple sensor to measure temperature. This discovery made an indelible contribution to the industrial revolution. In the early days, due to technical limitations, the sensor could not achieve the two functions of measuring temperature and humidity at the same time, so in order to measure the two important parameters of temperature and humidity, the temperature sensor and the humidity sensor had to be used at the same time. Temperature and humidity sensor for wall-mounted digital tube king shell The earliest human invented is the thermometer, and the principle of the thermometer is to use the thermal expansion of the liquid, and the height of the liquid column corresponds to the temperature scale to measure the current temperature. The disadvantage of this kind of thermometer is its limited range and limited accuracy. The humidity sensor is made of a simple humidity sensitive resistor (capacitor). The principle of measuring humidity by the humidity sensitive resistor and the humidity sensitive capacitor is due to the layer of polymer film covered on the humidity sensitive resistor, which will change with humidity. Affect the conductance value of the resistor or the capacitance value of the capacitor. Using this characteristic, the humidity sensor can measure the environmental humidity. Since then, with the development of science and technology, people have developed various temperature and humidity sensors. In this century, with the support of semiconductor technology, semiconductor thermocouple sensors, PN junction temperature sensors and integrated temperature sensors have been born. Correspondingly, according to the law of interaction between waves and matter, acoustic temperature sensors, infrared sensors and microwave sensors have been developed one after another. There are four main types of temperature sensors: thermocouples, thermistors, resistance temperature detectors (RTD) and IC temperature sensors. The thermocouple sensor has its own advantages and disadvantages. The sensitivity of the thermocouple temperature sensor has nothing to do with the thickness of the material, and the temperature sensor can be made with very thin materials. Also because the metal material used to make thermocouples has good ductility, this kind of fine temperature measuring element has extremely high response speed and can measure rapid changes. However, the sensitivity of the thermocouple sensor is relatively low, and it is easily affected by environmental interference signals, and is also easily affected by the temperature drift of the preamplifier, so it is not suitable for measuring small temperature changes. Functional application of temperature and humidity sensor and its classificationTemperature and humidity sensor is a sensor device equipped with humidity and heat sensitive elements that can be used to measure temperature and humidity, some with on-site display, 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. Analog type temperature and humidity sensor The integrated temperature and humidity sensor uses a digital integrated sensor as a probe and is equipped with a digital processing circuit to convert the temperature and relative humidity in the environment into the corresponding standard Analog signal, 4-20mA, 0-5V or 0-10V. The temperature and humidity integrated analog sensor can simultaneously convert the changes of temperature and humidity values u200bu200binto changes in current/voltage values, and can be directly connected to various standard analog input secondary instruments. Type 485 temperature and humidity sensor The circuit uses a microprocessor chip and temperature sensor to ensure the reliability, stability and interchangeability of the product. Adopt particle sintered probe sheath, the probe is directly connected with the shell. The output signal type is RS485, which can reliably carry out distributed monitoring with the host computer system, and can communicate with the maximum distance of 2000 meters. The standard modbus protocol supports secondary development. Network temperature and humidity sensorNetwork temperature and humidity sensor can collect temperature and humidity data and upload it to the server via Ethernet/WiFi/GPRS. Make full use of the established communication network to realize long-distance data collection and transmission, and realize centralized monitoring of temperature and humidity data. Can greatly reduce the amount of construction, improve construction efficiency and maintenance costs. 1 Ethernet type Ethernet type temperature and humidity transmitter, which can collect temperature and humidity data and upload it to the server via Ethernet. The product makes full use of the established Ethernet communication network to realize long-distance data collection and transmission, and realize centralized monitoring of temperature and humidity data. Can greatly reduce the amount of construction, improve construction efficiency and maintenance costs. The product adopts large-screen LCD display, with dual control of temperature and humidity upper and lower limits, free setting of limits, temperature and humidity calibration by password, network port data transmission and other functions, internal integrated alarm function module (buzzer or relay) , Can realize high and low temperature alarm and high and low humidity alarm. The product adopts the original high-quality temperature and humidity measurement unit imported from Switzerland, which has the characteristics of high measurement accuracy and strong anti-interference ability, which ensures the excellent measurement performance of the product. 2 WIFI type WIFI wireless data transmission temperature and humidity transmitter, which can collect temperature and humidity data and upload it to the server via WIFI. Make full use of the established WIFI communication network to realize data collection and transmission, and achieve the purpose of centralized monitoring of temperature and humidity data. Can greatly reduce the amount of construction, improve construction efficiency and maintenance costs. 3 GPRS type Based on GPRS transmission temperature and humidity transmitter, only a mobile or China Unicom SIM card, the collected temperature and humidity data can be uploaded to the server through the network base station , GPRS communication monthly flow is less than 30M. The equipment is widely used in pharmaceutical transportation vehicles, industrial control, building control, electric power, measurement and testing, warehouses, cold storage and other industries.
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