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Thermometers
Platinum Rhodium Thermocouple

1 Overview
又叫贵金属热电偶,它作为温度测量传感器,通常与温度变送器、调节器及显示仪表等配套使用,组成过程控制系统,用以直接测量或控制各种生产过程中0-1800℃范围内的流体、蒸汽和气体介质以及固体表面等温度。 WR series industrial platinum-rhodium thermocouple is also called precious metal thermocouple. As a temperature measurement sensor, it is usually used with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control various productions. The temperature of fluid, steam and gas medium and solid surface in the range of 0-1800 ℃ during the process.
When a platinum-rhodium thermocouple is a circuit composed of two conductors with different components connected to each other, a thermal current will be generated in the circuit when the two junctions have different temperatures. If there is a temperature difference between the working end and the reference end of the thermocouple, the display meter will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.
The thermoelectric heat of a platinum rhodium thermocouple will increase as the temperature of the measuring end rises. Its size is only related to the thermocouple material and the temperature at both ends, and has nothing to do with the length or diameter of the thermal electrode. zzyfwh.com
The shapes of various platinum-rhodium thermocouples are often very different due to their needs, but their basic structure is roughly the same. They are usually composed of main components such as thermal electrodes, insulation protection tubes and junction boxes.

2: application
Platinum and rhodium thermocouples are suitable for high temperature applications in various production processes, and are widely used for temperature measurement in powder metallurgy, sintering bright furnaces, vacuum furnaces, smelting furnaces, glass, steelmaking furnaces and ceramic and industrial salt bath furnaces.
主要技术参数电气出口:M20x1.5,NPT1/2 3: Main technical parameters of platinum rhodium thermocouple Electrical outlet: M20x1.5, NPT1 / 2
Accuracy grade: I, II
Protection level: IP65
Even wire diameter: Φ0.5
Nominal pressure: atmospheric pressure
4: Measuring temperature and tolerance

Thermocouple category
Code
Index number
Maximum temperature
measure temperature
Allowable deviation △ t ℃
Platinum rhodium 30-platinum rhodium 6
WRR
B
0 ~ 1800
0-1600
± 1.5 ℃ or ± 0.25% t
Platinum rhodium 10-platinum
WRP
S
0 ~ 1600
0-1300
± 1.5 ℃ or ± 0.25% t
NiCr-NiSi
WRN
K
0 ~ 1300
0-1100
± 2.5 ℃ or ± 0.75% t
Ni-Cr-Cu-Ni
WRE
E
0 ~ 800
0-800
± 2.5 ℃ or ± 0.75% t

的型号及规格 5: Model and specification of platinum rhodium thermocouple

model
Index number
Temperature measurement range ℃

Protection tube material

Thermal response time

specification
d
L xl

WRP-130
WRP2-130

S
0-1300
High alumina
< 150S
Φ16

300x150
350x200
400x250
450x300
550x400
650x500
900x750
1150x1000
1650x1500
2150x2000

WRP-131
WRP2-131

< 360S
Φ25

WRQ-130
WRQ2-130

R
0-1300
< 150S
Φ16

WRQ-131
WRQ2-131

< 360S
Φ25

WRR-130
WRR2-130

B
0-1600
Corundum tube
< 150S
Φ16

WRR-131
WRR2-131

< 360S
Φ25

(1) Order the thermocouple I according to the agreement;

(2) The non-inserted part is carbon steel.