The temperature and humidity monitoring device is a sensor that can sense temperature and convert it into an output signal.
Classification of the temperature and humidity monitoring device
1. Contact type
The detection part of the contact the temperature and humidity monitoring devic
e has good contact with the measured object, also known as the thermometer.
Thermometer achieves thermal equilibrium by conduction or convection, so that the thermometer indication can directly represent the temperature of the object under test. They are widely used in industry, agriculture, commerce and other sectors. These thermometers are also often used in daily life. With the application of cryogenic technology in national defense engineering, space technology, metallurgy, electronics, food, medicine and petrochemical industry, and the research of superconducting technology, cryogenic thermometers for measuring temperatures below 120K have been developed, such as cryogenic gas thermometers, steam pressure thermometers, acoustic thermometers, paramagnetic salt thermometers, quantum thermometers, cryogenic thermal resistors and cryogenic differential couples and so on. Cryogenic thermometers require small size, high accuracy, good reproducibility and stability of temperature sensors.
2. Non-contact type
Its sensitive elements are not in contact with the object under test, also known as non-contact thermometer. This instrument can be used to measure the surface temperature of moving objects, small targets and objects with small heat capacity or rapid temperature change, and also to measure the temperature distribution of the temperature field. Commonly used non-contact thermometers are based on the basic law of blackbody radiation, which is called radiation thermometers. Radiation thermometry includes luminance method, radiation method and colorimetry method. The effect of additional radiation can improve the effective radiation and emission coefficient of the measured surface. The actual temperature of the measured surface can be obtained by correcting the measured temperature with the effective emission coefficient through the instrument. A typical additional mirror is a hemispherical mirror. The effective emission coefficients of the cylindrical cavity after reaching the thermal equilibrium with the medium are calculated. In automatic measurement and control, the real temperature of the medium can be obtained by correcting the measured bottom temperature of the cavity.
Main Applications of The temperature and humidity monitoring device
Temperature is a physical quantity representing the degree of heat and cold of objects, and it is an important and universal measurement parameter in the process of industrial and agricultural production. Temperature measurement and control play a very important role in ensuring product quality, improving production efficiency, saving energy, production safety and promoting the development of national economy. Because of the universality of temperature measurement, the number of temperature sensors ranks first among all kinds of sensors, accounting for about half.
Because of the wide range of temperature measurement in industrial and agricultural production, the temperature sensor made of various materials can only be used in a certain temperature range, ranging from several hundred degrees below zero to several thousand degrees above zero.