J-type thermocouple 
 Product Code: 002010111502 
 Model: WRF-101 WRF-130 WRF-230 WRF-330 WRF-430 WRF-630 
 Product Note: Thermocouple order by agreement 
 Category: Thermocouple Thermocouple assembly → 

 Iron - copper-nickel thermocouple (J-type thermocouple), also known as iron - constantan thermocouple, is also an cheap inexpensive metal thermocouple. It's positive (JP) in the name of the chemical composition of pure iron, negative (JN) for the copper-nickel alloy, is often vaguely called constantan, its nominal chemical composition: 55% copper and 45% nickel and a small but it is very important manganese, cobalt, iron and other elements, do call it constantan, but different from the nickel-chromium - constantan and copper - constantan of constantan, it can not be replaced with EN and TN. Iron - constantan thermocouple to measure temperature zone of coverage -200 ~ 1200 ℃, but usually the temperature range 0 ~ 750 ℃ ??for the 
 J-type thermocouple has good linearity, thermal electromotive force larger, high sensitivity, stability and uniformity better, cheaper, etc., widely used by the user. 
 J-type thermocouple can be used to vacuum, oxidation, reduction, and inert atmosphere, but positive rapid oxidation of iron at high temperatures, so the temperature is limited, no protection can not be directly used in high temperature curing atmosphere. 
 The main technical parameters 
 Product performance standards 
 IEC584 
 GB/T16839-1997 
 JB/T5582-1991 
 Order Notes: 
 1 indicate the thermocouple type, number of sub-degree, temperature. 
 2 thermocouple protection tube diameter and length. 
 3 fasteners, flange units, provide sizes.