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Classification of temperature transmitters: contact temperature transmitter and non-contact temperature transmitter
Temperature is a physical quantity that expresses the degree of heat or cold of an object, and is a very important and common measurement parameter in the process of industrial and agricultural production. The temperature sensor is the earliest developed and most widely used type of sensor. Due to the universality of temperature measurement, the number of temperature sensors ranks first among various sensors, accounting for about 50%. From the beginning of the 17th century, people began to use temperature for measurement. With the support of semiconductor technology, semiconductor thermocouple sensors, PN junction temperature sensors and integrated temperature sensors have been developed in this century. Temperature sensors measure indirectly by changing certain characteristics of objects with temperature changes. The characteristics of many materials and components change with temperature, so there are quite a few materials that can be used as temperature sensors. Temperature sensor changes in physical parameters with temperature: expansion, resistance, capacitance, electromotive force, magnetic properties, frequency, optical characteristics, thermal noise, and so on. The contact mode between the temperature sensor and the measured medium is divided into two categories: contact type and non-contact type. The contact temperature sensor needs to maintain thermal contact with the measured medium, so that the two can perform sufficient heat exchange to reach the same temperature. The non-contact temperature sensor does not need to be in contact with the measured medium, but is transmitted to the temperature sensor through the heat radiation or convection of the measured medium to achieve the purpose of temperature measurement. The main feature of this temperature measurement method is that it can measure the temperature of substances in motion (such as the bearing temperature of a slow-moving train, the temperature of a rotating cement kiln) and objects with a small heat capacity (such as the temperature distribution in an integrated circuit). Non-contact temperature measurement is the biggest advantage of infrared thermometers, allowing users to easily measure targets that are difficult to approach or move. The infrared temperature sensor can calculate the surface temperature of the object by measuring the intensity of infrared radiation emitted by the target without touching the target. The temperature sensor is an integrated infrared temperature sensor. The sensor, optical system and electronic circuit are integrated in a stainless steel housing; it is easy to install, and the standard thread on the stainless steel housing can be quickly connected to the installation site; there are also various options (Various instruments, large screens, paperless recorders, purge protective covers, laser sights, adjustable mounting brackets, etc.) to meet the requirements of various working conditions. There are many types of contact temperature sensors, such as the Prince Shell single temperature transmitter. The equipment adopts a wall-mounted waterproof shell, which is mostly used in outdoor and on-site environments where the environment is harsh. Adopt standard industrial interface 4～20mA/0～10V/0～5V analog quantity signal output, which can be connected to field digital display meter, PLC, frequency converter, industrial control host and other equipment. Because the temperature measurement range in industrial and agricultural production is extremely wide, from a few hundred degrees below zero to several thousand degrees above zero, temperature sensors made of various materials can only be used within a certain temperature range. In order to be suitable for different sites, we provide various types of temperature probes for customers to choose, which are widely used in communication rooms, warehouse buildings and automatic control and other places that require temperature monitoring. There are several types of probes: Extended flat stainless steel probe: This probe is flat and has a large contact area with the surface of the object to be measured. The temperature measurement is more accurate, but the customer needs to make a fixture to press it. The probe is waterproof, measuring range is -40~+80℃;Extended round stainless steel probe: this probe is more versatile, completely sealed, and the probe is waterproof, suitable for measuring liquid temperature, temperature range: -40~+80℃; Epitaxial magnetic probe: The probe is magnetic, can be adsorbed on the metal surface, measure the temperature of the metal surface, the probe is waterproof, temperature range: -40~80℃;Extended ultra-high temperature probe: probe with high temperature wire Cable, monitoring range 0~+300℃;Extended ultra-low temperature probe: monitoring range -100~+200℃;Extended quadruple pipe threaded probe: used to measure the water temperature in the water pipe; water pipe tee or water pipe The end is equipped with a four-point pipe thread, and it is matched with this probe. The measurement range is -40~+80℃;In production and life, temperature measurement and control are essential to ensure product quality, improve production efficiency, and save energy. Production safety and promoting the development of the national economy play a very important role.
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