Thermocouple Grade Thermocouples are formed by two dissimilar thermoelements so joined as to produce a thermal emf when the junction are at different temperature. The different grades of thermocouples alloys are used depending upon temperature being measured, working atmosphere and characteristics of physical atmosphere. JLC produces various grades of thermocouples wires and strips as per international specifications. The properties and emf tolerances for these grades of JLC thermocouples are shown in table-1 . For connecting thermocouples to temperature indicating instruments the best way is to use the leads made of same material.
Extension leads avoid lead junction error .
The different grades of these materials and the emf tolerance for these grades over a required temperature range are shown in table-2 . Standard Specification JLC range of thermocouple alloys meets the specification of ASTM E 230 and ANSI MC 96.1. JLC thermocouple alloys also confirm to IS, IEC, DIN, BS, NF, UNI, ENI, JIS, ENEL and GOST standard. Thermocouple alloys for Mineral Filled Sheathed cables are made confirming to ASTM E 608 and ASTM E 585. Special tolerance and properties are made available on customer request.