Temperature instrument according to the working principle of some type1

According to the measurement mode, temperature measuring instrument can be divided into two types: contact and non-contact. Measurement, the test part measured media contact to contact directly with the temperature measuring instrument; Non-contact temperature measuring instrument in the measurement, temperature measuring instrument detection part don't have to and direct contact with the measured medium, so the temperature of the moving object can be obtained. Then the temperature measuring instrument, the installation work can be divided into several types?

temperature measuring instrument according to its working principle can divide the following several types:

1, the material level meter direct reading type such instruments are mainly glass tube liquid level meter, glass level gauge, etc. They are using the principle of communicating vessels.

2, differential pressure type level instruments such instruments and can be divided into pressure type level gauge and differential pressure type level instruments. They were using liquid column or level accumulation to a certain point pressure and the principle of the work.

3, buoyancy material level meter can be divided into the float with this kind of instrument or steel wire rope belt, floating ball with lever and several kinds of heavy cylinder type. They are using the float height change with liquid level change and immerse themselves in liquid or liquid on the float ( Or sinking) The buoyancy of the principle of liquid level height and change to work.

4, magnetic material level meter this kind of instrument can be divided into resistance type ( The electrode type) , capacitive and inductive to wait for a few kinds. They are the level of change into some electricity, detected by measure the change of these power level. In addition, also have the use of piezomagnetic effect work level instrument.

5, the radiation type level instruments this kind of instrument is the use of radiation through the material, its strength changes with the thickness of material layer and the principle of work, is seven rays at present is widely applied.

6, sound level meter such instruments can be divided into sound waves breaking type according to its working principle, reflection and damping. The principle is: due to the change of material level caused by the change of acoustic impedance, sound waves breaking and acoustic reflex the different distance, measure these changes can be detected level.

7, optical material level meter type of instrument is to use the material level for the work of the principle of interrupt and reflection of light waves. It USES light source can be a ordinary incandescent lights, also can be laser

in addition to the above several kinds of measuring temperature meter, modern also developed a variety of other types of temperature measuring instrument, such as with transistor temperature measuring element and optical fiber temperature measuring element consisting of instruments; Thermal imaging systems using the thermal image scanning way, can be directly display and temperature field of hot object to be tested as figure, can be used to check the surface temperature distribution of large furnace body, engine and so on, very helpful for saving energy; Measurement and using a laser, the temperature distribution of temperature measuring instrument, etc.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor