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Industry Information
Development history of pressure thermometers
2012-2-24 11:18:04


Overview


以及由此开发的系列化测温仪表,克服了原仪表性能单一,可靠性差以及温包积大的缺点,并将测温元件体积缩小到原来的1/30或1/60,创造性地将传感器热电阻安装于测温元件内,实现了机电一体化的测温功能。 The new generation of liquid pressure thermometer and the series of temperature measuring instruments developed from it overcome the shortcomings of the original instrument's single performance, poor reliability, and large temperature envelope, and reduce the temperature measuring element volume to 1/30 or 1 / 60. The sensor thermal resistance is creatively installed in the temperature measuring element, and the mechatronic temperature measurement function is realized. Formed a multi-functional serial temperature meter with a liquid pressure thermometer as the basic temperature measuring instrument for remote transmission, anti-vibration, anti-corrosion, electrical contact, and temperature signal transmission. Divided into two series, ordinary type and explosion-proof type.


working principle


The principle of the thermometer is based on the relationship between the saturated vapor pressure and temperature of the evaporated liquid in a closed temperature measurement system, and the temperature is measured. When the temperature package feels the temperature change, the saturated steam in the closed system generates the corresponding pressure, causing the curvature of the elastic element to change, causing the free end to shift, and then the displacement is changed to the indicated value by the gear amplifying mechanism. This thermometer has a temperature Small package, fast response speed, high sensitivity, intuitive reading and other characteristics, almost all the advantages of glass rod thermometer, bimetal thermometer, gas pressure thermometer, it can be made into shock-proof, anti-corrosion type, and can realize remote contact Signal, thermal resistance signal, 0-10mA or 4-20mA signal. It is the most widely used and most comprehensive mechanical temperature measuring instrument.


Technical data



● Temperature measurement range: 0-100 ° C 20-120 ° C


● Precision level: 1.5


● Explosion-proof grade: dⅠ, dⅡBT, dⅡCT, dⅡBT, dⅡCT


● Insulation class: Class F


● Ambient temperature: -20 ~ 45 ° C


● Relative temperature: less than 90%


● Altitude: less than 2000M


● Thermal resistance accuracy class: B class


● Time constant: 34S

是由英国科学家波尔顿先生20世纪四十年代初设计生产的。 The pressure thermometer was designed and manufactured by British scientist Mr. Bolton in the early 1940s. In the late World War II, only Britain, the United States, the Soviet Union, and Germany were producing in the world. After the founding of New China in the 1950s, with the help of Soviet experts, the temperature instrument factory in Shanghai at that time introduced a full set of design information and equipment from the Soviet Union according to the national plan and began to produce pressure thermometers. The initial annual output was only a few hundred . In the early 1960s, driven by the "Great Leap Forward," the country's industrial development was rapid, and demand for pressure-type thermometers rose sharply. According to the national plan, the Shanghai Thermometer Factory handed over the pressure thermometers to Hangzhou Thermometer Factory and Shanghai Qingpu Thermometer Factory for production and division of labor. Hangzhou Thermometer Factory is responsible for the production of ordinary pressure thermometers, and Shanghai Qingpu Temperature Instrument Factory is responsible for the production of electrical contact pressure thermometers. At that time, the annual national demand totaled more than 10,000. In the mid-1970s, the Cultural Revolution ended and industrial production picked up. According to the state plan, production pressure thermometers were set up in the northern and central parts of the country. Hangzhou Hongxing Instrument Factory supported by Hangzhou Thermometer Factory to produce pressure type thermometers. By the late 1970s and early 1980s, the designated manufacturers of pressure-type thermometers had grown to four in Shanghai, Hangzhou, Tianjin, and Zhengzhou. The national annual demand reached 300,000 to 400,000, of which the annual output of the Hangzhou thermometer factory reached 150,000. Only, accounting for nearly half of the national demand. Beginning in the mid-1980s, with the transition from the planned economic system to the market economic system and the deepening of reform and opening up policies, domestic township and village enterprises have sprung up. Among the four factories designated by the original state, many backbones in science and technology, management, and workers went to towns and villages. There are dozens of pressure thermometer manufacturers in Zhejiang, Shanghai, Tianjin, Henan and other places. In the 1990s, after years of hard work, some of these township and village enterprises even reached a considerable scale. With the development of mechatronic products, especially the widespread application of computers in the industry, many industrial applications of pressure thermometers have been replaced by other mechatronic products and digital and smart meters. With the intensification of market competition and the increase of alternative instruments, the demand for pressure thermometers has also declined. Up to now, many enterprises have stopped production or changed careers. It is estimated that the annual national demand is still around 200,000, and the annual national demand is expected to decrease year by year.

The development direction of pressure thermometer

Pressure thermometers have the advantages of being easy to use, intuitive to observe the temperature, and being able to measure temperature from a distance from a temperature measurement source, but also have their disadvantages. The main reasons are the use of non-ferrous metals, high cost, and easy damage such as "plugging" and "leaking". In recent years, many manufacturers have selected thermometers for near-surface temperature measurement. Pressure-type thermometers have been replaced by bimetal thermometers, thermocouples, and resistance thermometers.

在基地现场测温的同时,能与计算机接口。 With the application of computers in industrial equipment, pressure thermometers are required to interface with computers while measuring temperature at the site. To this end, a temperature-resistance thermal resistor can be embedded in the temperature-measuring element of the pressure thermometer, so that it has an electrical signal output, and then converted to a computer interface to form a mechatronic pressure thermometer. The use of such thermometers is now on the rise.