What _ instrument type and characteristic of thermocouple is

Thermocouple application is very extensive, thermocouple temperature detection instruments commonly used in the industrial field. Characteristics of the thermocouple type and characteristics of the thermocouple and 1, fast response time interval is relatively small. 2, wide temperature range, can be in 0 ~ 2300 ℃ temperature range. 3, measurable specific parts or the temperature of the narrow places. 4, due to temperature reflects the emf value, thus for temperature measurement, adjustment, control, amplification, transformation can be easily performed. 5, standardization of thermocouple is easy to obtain, the price is relatively cheap. The type of thermocouple type thermocouple from thermocouple temperature measurement principle, the measured temperature change 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 thermocouple is by thermal components ( The resistor body) , wire, insulation materials, stainless steel casing combination solid body, its diameter is commonly phi - 2 Phi is 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, small measuring hysteresis; 2 good mechanical properties, resistance to vibration and shock. 3 can bend, easy to install 4 long service life. Capillary thermocouple ends thermocouple temperature sensing element resistance wire winding by special processing, close to the face in the thermometer. Compared with general axial thermocouple, it can reflect more correctly and quickly end face of the actual temperature being measured, is suitable for measuring temperature bearing and other parts of the face. Flameproof thermocouple junction box flameproof thermocouple with special structure, its shell internal explosive mixed gas by affected by sparks or electric arc explosion limit within the junction box, that wouldn't make production field explosion. Flameproof thermocouple can be used in the bla B3c level zone with explosion danger place temperature measurement. Thermocouple installation method 1, first of all should be good measuring thermocouple the size of the teeth, the car a good teeth. 2, according to the diameter of the screw tooth holder, the need to measure the hole in the pipeline. 3, the teeth of welding, the screw tooth seat insert has open hole, the screw teeth with measured pipe welding. 4, the thermocouple precession is welded teeth. 5, according to the wiring diagram to connect the thermocouple junction box good line, and connected to the corresponding display instrument dial photogenic, pay attention to the junction box cannot be measured medium and pipeline wall contact, to ensure that the terminal box temperature less than 0 Range of 100 ℃, terminal box shall be installed under the outlet hole, to prevent bad sealing, water vapor dust deposition such as shorting terminal. 6, the location of the thermocouples installed, should consider to repair and maintenance is convenient.