成人午夜看黄在线尤物成人-色噜噜狠狠一区二区免费-国产69久久精品成人看-亚洲一区中文字幕永久在线

     
  中文版 English
 
Hot news:
  News
  Company news
  Industry News
  Current news
Hot Product
IPX1 IPX2 Drip Waterproof Test...
UL1439 Sharp Edge Tester
BND-TPK05 IEC 60529 Test Probe...
IEC62368 test probe kit BND-TP...
IEC 61032 Standard Test Probe ...
IEC60320 EN60320 Appliances co...
UL 498 Standard Plugs and Rece...
IPX1 to IPX4 Drip rain test an...
Vertical horizontal vibration ...
IP5X IP6X Sand and dust proof ...
climate constant temperature a...
IPX1 to IPX9 waterproof testin...
 
 
Industry News
Home  -  News  -  Industry News
What is J-type thermocouple?
From: BONAD  Date: 2024-08-21 14:52:14

What is J-type thermocouple? | BOAND

J-type thermocouple, also known as iron-constantan thermocouple, is also a low-cost metal thermocouple. Its positive electrode (JP) has a nominal chemical composition of pure iron, and its negative electrode (JN) is a copper-nickel alloy, which is often referred to as constantan. Its nominal chemical composition is: 55% copper and 45% nickel, as well as a small amount of very important elements such as manganese, cobalt, and iron. Although it is called constantan, it is different from constantan of nickel-chromium-constantan and copper-constantan, so it cannot be replaced by EN and TN. The measurement temperature range of iron-constantan thermocouple is -200~1200℃, but the commonly used temperature range is 0~750℃. J-type thermocouple has the advantages of good linearity, large thermoelectric potential, high sensitivity, good stability and uniformity, and low price, and is widely used by users. J-type thermocouples can be used in vacuum, oxidation, reduction and inert atmospheres, but the positive iron oxidizes faster at high temperatures, so the use temperature is limited, and it cannot be used directly in a sulfiding atmosphere at high temperatures without protection.

When the two ends of the thermocouple are connected into a loop, when the temperatures of the two junctions are different, a thermal current will be generated in the loop. If there is a temperature difference between the working end and the reference end of the thermocouple, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.

The thermoelectric heat of the thermocouple will increase as the temperature of the measuring end increases. Its size is only related to the thermocouple material and the temperature of the two ends, and has nothing to do with the length and diameter of the thermoelectrode.

The appearance of various thermocouples is often very different due to needs, but their basic structure is roughly the same, usually consisting of thermoelectrodes, insulating sleeve protection tubes and junction boxes.


 
 
Home  |  Products  |  News  |  About us  |  Feedback  |  Contact us  |  
Copyright © 2008-2015 Hong Kong Bonad Technology Limited | Shenzhen Bonad Instrument Co., LTD. All Rights Reserved.
 
    Add:C505, Hongdu Building,Bao\\\'an45 district,Shenzhen,518101,Guangdong Province,China    Tel:+86-13380391156    Fax:0755-23721200    Email:Alice@szbonad.com
 
溧阳市| 海晏县| 乡宁县| 彭阳县| 凤城市| 邓州市| 栖霞市| 望江县| 克拉玛依市| 阳高县| 屏东县| 仁布县| 南昌县| 贺兰县| 蒙阴县| 韩城市| 嵊泗县| 大新县| 杭锦旗| 凤台县| 冷水江市| 建湖县| 罗田县| 湘潭县| 康定县| 昌宁县| 阿克苏市| 隆化县| 永吉县| 邯郸市| 禄丰县| 白水县| 新田县| 德兴市| 繁峙县| 锦屏县| 济阳县| 岳普湖县| 太康县| 三江| 威海市|