Introduction and Comparison of Thermocouple Temperature Sensing Lines

Instructions:

The background principle of thermocouple is "seebeck effect", also known as the thermoelectric effect, the phenomenon is that when two different metal endpoints are connected to form a closed loop, and if there is a temperature difference between the two endpoints, then there will be current generated between the loops, and the higher temperature contact in the loop is called "hot junction". This point is usually placed at the temperature measurement; The lower end of the temperature is called "cold junction", that is, the output end of the thermocouple, whose output signal is: DC voltage is converted into a digital signal through the A/D converter and converted into the actual temperature value through the softwares algorithm. 

Various electric heating couples and their range of use(ASTM E 230 T/C):

type E

type J

type K

-100℃ to1000℃±0.5℃

0℃ to760℃±0.1℃

0℃ to1370℃±0.7℃

棕色(外皮颜色)+紫色-红色

棕色(外皮颜色)+白色-红色

棕色(外皮颜色)+黄色-红色

JIS,ANSI(ASTM) thermoelectric coupling appearance identification:

热电耦

JIS

ANSI(ASTM)

 

 

 

 

外皮

正端

负端

外皮

正端

负端

 

B type

灰

红

白

灰

灰

红

R,S type

棕

红

白

绿

棕

红

K,W,V type

青

红

白

黄

黄

红

E type

紫

红

白

紫

紫

红

J type

黄

红

白

棕

白

红

T type

茶

红

白

青

青

红

Note:

1.ASTM, ANSI: American standard

2.JIS: Japanese standard