They are wires to compensate for the errors caused by the temperature change in the terminal portion of thermocouple by insulating a pair of conductors -- whose thermoelectric characteristics are almost similar to those of thermocouple -- in a temperature range of low to high temperature and by connecting the terminal of the thermocouple to the reference contact. They are used in all industries requiring heat management such as power plants, petrochemical plants, steel smelters, and small boilers.
Types
| Thermocouple Extension wire | ||||
| Type | material | Limit of error (Temp. Range) | ||
| KSC 1609 (JISC 1610) | ANSI MC 96.1 | |||
| K Chromel/Alumel | KX | (+)Chromel (-)Alumel | ±2.5˚c (-20~150˚c) | ±2.2˚c (0~200˚c) |
| K Chromel/Alumel | EX | (+)Chromel (-)Constantan | ±2.5˚c (-20~150˚c) | ±1.7˚c (0~200˚c) |
| K Chromel/Alumel | TX | (+)copper (-)Constantan | ±2.5˚c (-20~150˚c) | ±1.0˚c (-06~200˚c) |
| K Chromel/Alumel | JX | (+)iron (-)Constantan | ±2.5˚c (-20~150˚c) | ±2.2˚c (0~200˚c) |
| R Platinum-Rhodium Platinum | RX | (+)Copper (-)Cu-Nickel alloy | ±3˚c~7˚c (0~100˚c) | ±25˚c (0~200˚c) |
Application
It is used mainly in wiring of electric apparatus and equipment under 0.6/1kV grade.
Characteristics of Product
● Cable rating : 0.6/1kV 90℃
● Standard : UL Subject 44, IEC 60228
● Conductor Grade : Annealed tinned copper (Class 2 or 5)
● Flame retardant : (UL) VW-1, VTFT
600V Heat-Resistant PVC Insulated Wire
Application
Type THW listed by UL is suitable for use in wet and dry locations at 75℃
This wire is generally used in conduit or other approved raceways in commercial wiring, as specified in the National Electrical Code.
Standard
UL83 Thermoplastic insulated wires and cables
Construction
Conductor Solid or stranded annealed copper
Insulation Flame-retardant, Heat-, Abrasion- and moisture-resistant PVC
Color
The standard color is black, when required for a particular application, other colors are available
600V Heat-Resistant PVC Insulated and Nylon Jacketed Wire600V Heat-Resistant PVC Insulated Wire
Application
Type THHN is suitable for use in dry locations at 90
Type THWN is suitable for use in dry and wet locations at 75
These wires are generally used in conduit as branch circuits in commercial or industrial applications, as specified in the
National Electrical Code.
Standard
UL83 Thermoplastic insulated wires and cables
Construction
Conductor Solid or stranded annealed copper
Insulation Flame-retardant, Heat-, Abrasion-and moisture-resistant PVC with clear nylon jacket
Color
The standard color is black, when required for a particular application, other colors are available
