Temperature and humidity sensors mainly include the following three categories: analog temperature and humidity sensors Temperature and humidity sensors Temperature and humidity integrated sensors use digital integrated sensors as probes and digital processing circuits to convert the temperature and relative humidity in the environment into corresponding standard analog signals, 4-20mA, 0-5V or 0-10V. The temperature and humidity integrated analog quantity sensor can convert the changes of temperature and humidity values into the changes of current/voltage values at the same time, and can be directly connected with various standard analog input secondary instruments. The circuit of 485 temperature and humidity sensor adopts microprocessor chip and temperature sensor to ensure the reliability, stability and interchangeability of the product. Particle sintered probe sheath is adopted, and the probe is directly connected with the shell. The output signal type is RS485, which can reliably carry out distributed monitoring with the upper computer system, and can communicate up to 2000 meters. The standard modbus protocol supports secondary development. Network temperature and humidity sensor 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 remote data acquisition and transmission, and realize centralized monitoring of temperature and humidity data. It can greatly reduce the construction amount, improve the construction efficiency and maintenance cost. 1 Ethernet type temperature and humidity transmitter can collect temperature and humidity data and upload them to the server through Ethernet. The product makes full use of the Ethernet communication network that has been set up to achieve remote data acquisition and transmission, and achieve centralized monitoring of temperature and humidity data. It can greatly reduce the construction amount, improve the construction efficiency and maintenance cost. The product adopts large LCD display, with dual control of upper and lower limits of temperature and humidity, free setting of limit values, temperature and humidity calibration by password, network port data transmission and other functions. The 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, ensuring the excellent measurement performance of the product. 2 WIFI wireless data transmission temperature and humidity transmitter can collect temperature and humidity data and upload them to the server through WIFI. Make full use of the established WIFI communication network to realize data acquisition and transmission, so as to achieve the purpose of centralized monitoring of temperature and humidity data. It can greatly reduce the construction amount, improve the construction efficiency and maintenance cost. 3 GPRS type temperature and humidity transmitter based on GPRS transmission can upload the collected temperature and humidity data to the server through the network base station with a mobile or Unicom SIM card. The monthly GPRS communication flow is less than 30M. The equipment is widely used in pharmaceutical transport vehicles, industrial control, building control, power, measurement and testing, warehouse, cold storage and other industries.
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