10.8 MAP® Thermocouple Wire (Compensation Grade & Extension Grade)

【The Best Solution of Thermocouple Cable】  

【 Principle of Thermocouple 】 

A thermocouple is composed of two wires made from dissimilar metals. These two wires are joined to form a temperature measurement junction. Each wire is made of a specific metal or metal alloy. For example, the positive (+) conductor of a type K thermocouple is made of a chromium/nickel alloy called chromel and the negative (-) conductor is made of an aluminum/nickel alloy called alumel. The wire used to make a thermocouple junction is called thermocouple wire.

【Various insulating materials and physical properties】

【Resistance Temperature Detectors (RTDs)】

There are other temperature measurement technologies than the thermocouple such as RTDs (resistance temperature detector). In applications with temperatures above 1,200° F (650° C), the thermocouple is used. At lower temperatures, RTDs are used for their simpler operation and greater sensitivity and stability. Thermocouples have a better response time. RTDs are special resistors whose resistance value changes with temperature in a known way. RTDs are connected to the temperature recording or process control instrumentation using an ordinary copper instrumentation cable. A thermocouple wire is not required to connect an RTD.

A typical RTD cable is a standard instrumentation cable in two, three, or four conductors or possibly groups of pairs/triads/quads depending on the type of RTD being used and a number of devices being monitored. Individual or overall shielding is often used for noise immunity.

RTD- 【 Compesation Grade  】

RTD- 【 Extension Grade  】