Thermocouple and standard platinum resistance what is the difference between the two temperature gauges _ instrument1

In our country, the standard platinum resistance thermometer has been widely used. Especially outside the quartz tube second-class standard platinum resistance thermometer, widely used in various temperature measurement laboratory, dissemination and precise temperature measurement. Standard platinum resistance thermometer has two kinds of outer tube, quartz external protecting tube and metal outer security tube. Quartz protection pipe standard platinum resistance thermometer and metal outer security standard platinum resistance thermometer have their advantages and disadvantages. Specific choose which kind of thermometer, according to the actual situation of the user to decide. Generally speaking, quartz protection pipe standard platinum resistance thermometer can achieve stability is better than the protection pipe outside the metal standard platinum resistance thermometer, therefore, so far, quartz external protecting tube standard platinum resistance thermometer benchmark hierarchy can be work, first class or second class, and the level of protection pipe standard platinum resistance thermometer outside the metal is usually are second-class. However, the protection pipe outside the metal is the advantage of standard platinum resistance thermometer is not easy to damage, can be in a lot of the acid medium temperature, metal block or harsh environments. This is very important, because the standard platinum resistance thermometer is damaged after is often beyond repair. From the thermocouple temperature measurement principle, the measured the change in temperature is directly measured by thermocouple resistance change, therefore, the wires of a thermocouple body such as a variety of wire resistance change will affect temperature measurement. Thermocouple is by thermal components ( The resistor body) , wire, insulation materials, stainless steel casing combination solid body, its diameter is generally from 2 to 8 mm, achieve more xiaoke phi is 0. 25mm。 Compared with conventional type thermocouple, it has the following advantages: (1) small volume, no internal air gap, thermal inertia, the measured value after small; (2) good mechanical properties, resistance to vibration and shock. (3) can bend, easy to install; 4. Long service life. Thermocouple temperature measuring instrument is commonly used in temperature measuring element, is made up of two different components of the conductor when two ends synthesis loop, when the two junction thermocouple temperature is not at the same time, will produce thermal current in the circuit. If the work end of the thermocouple with the reference entity temperature difference, display instrument will indicate the thermocouple thermoelectric potential of the corresponding temperature value. Thermocouple is a kind of temperature sensor, it is smaller than the diameter of a prefabricated thermocouple, flexible, good vibration resistance, suitable for installation in the case of prefabricated thermocouple can't install, the company produces the thermocouple used to introduce thermocouple temperature measuring element, therefore, is accurate, sensitive, fast thermal response time, stable quality, long service life, etc. Tel: 023 - 68280988, 023 - 68288698