What is thermocouple wire in the analysis of the use of the _ instrument

The situation of the crack of thermocouple wire thermocouple wires in the process of using long soak in the guide bearing, thrust bearing oil groove, make the conductor hard brittle and wires are hard to bend. Wire surface cracks appear many, serious when the conductor of the wire inside also appears cracks, wire line core bare outside. To solve this problem, will notice when the choose and buy, be sure to choose oil resistant and temperature resistant thermocouple wire materials, such as fep ( 聚全氟乙丙烯) Referred to as 'f - 46, is a copolymer of tetrafluoroethylene and hexafluoropropylene, is a modified ptfe material. They have good oil resistance, corrosion resistance and heat resistance, can be in - 250 ~ 250 ℃ temperature in use for a long time. In addition their cracking resistance is also very outstanding, can thoroughly solve the long wire bubble in oil cracking problems. Disconnection of the thermocouple wire happen: some thermocouple conductor is the root of bolt is more serious, some broken directly, some external insulation disconnect. To solve this problem, we can give our sensor back-end do spring protection device, prevent oil flow caused by the shock, vibration, bending conductor is the root of bolt; Sensor can also be the roots stretching out with silk, such conductor is impacted by oil flow is all part of the wire, because the wire is bent arbitrarily, so that makes conductor wire with stainless steel shell, completely solve the problem of wire by oil corrosion and impact. Service life is longer, more reliable performance. Thermocouple wire cable wire diameter is too small, including wire diameter and single strand wire conductor wire diameter. To solve this situation, everyone at the time of custom thermocouple to be decided according to own actual situation, generally can choose thermocouple wire diameter, respectively is: three core, four core is about 5 mm, 6 core is about 6 mm. Thermocouple wires is with net shield, line core for silver plated core, performance is very stable. Of thermocouple temperature measurement principle and the measurement of the thermocouple WenLi, thermocouple temperature measurement is based on the heating effect of the resistance, the resistance of the characteristics of the resistance varies with temperature. Therefore, as long as the measured temperature thermocouple resistance changes, can measure the temperature. At present there are mainly metal thermocouple and thermistor two types of semiconductor. Commonly used in low temperature zone thermocouple is a kind of temperature detector. Thermocouple temperature measurement is based on the metal conductor resistance value increases with the increase of the temperature of the properties for temperature measurement. Its main characteristic is high accuracy, stable performance. The platinum thermocouple measuring accuracy is high, it is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument. Thermocouples are mostly made of pure metal materials, the application is a lot of platinum and copper, in addition, now began to use the materials such as nickel, manganese and rhodium thermocouple. Metal thermocouple commonly used thermal material sort is more, the commonly used is a platinum wire. Industrial measurement with metal material in addition to the platinum wire, thermocouple as well as copper, nickel, iron, iron - Nickel, etc.