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The working principle of the platinum rhodium thermocouple is that when the two ends of the conductor with two different components are connected to the synthetic circuit, when the temperature of the two junction points is different, the thermal current will be generated in the circuit. If there is a temperature difference between the working end and the reference end of the thermocouple, the display instrument will indicate the temperature corresponding to the thermoelectric potential generated by the thermocouple.
Platinum rhodium thermocouple in the thermocouple series has the advantages of high accuracy, good stability, wide temperature measurement range, long service life, high temperature upper limit, etc. It can be used in oxidizing and inert atmosphere, or in vacuum for a short time, but not in reducing atmosphere or atmosphere containing metal or non-metal vapor.
Selection of platinum rhodium thermocouple: it is recommended to use single platinum rhodium thermocouple (Platinum Rhodium 10 platinum) when the measured temperature is normal at 1000-1300 ºC, and double platinum rhodium thermocouple (platinum rhodium 30 platinum rhodium 6) when the measured temperature is normal at 1200-1600 ºC, so as to ensure the service life of platinum rhodium thermocouple within the temperature range used.
Type B thermocouple
Advantage: no compensation wire is needed, because the thermal potential is less than 3 μ V in the range of 0 ~ 50 ºC.
Disadvantages: the disadvantages of platinum rhodium thermocouples are thermal potential, small thermoelectric potential rate, low sensitive reading, low mechanical strength at high temperature, very sensitive to pollution, expensive precious metal materials, so a large one-time investment.
Product name | Type S/B/R Platinum Rhodium Thermocouple | ||
Type | S | B | R |
Maximum continuous operating temperature | 1600ºC | 1800ºC | 1600ºC |
Short term use | 1700ºC | 1800ºC | 1700ºC |
Extension wire | 0-200ºC | 0-100ºC | 0-200ºC |
Standard | ±1.5ºC or ±0.25% | ±0.5% | ±1.5ºC or ±0.25% |
Special limits or error | ±0.6ºC or 0.1% | ±0.25% | ±0.6ºC or 0.1% |
Material | 99% high temperature corundum tube, Or GH3039 high temperature alloy tube or SIC protection tube | ||
Stainless steel tube | OD φ22mm | ||
Ceramic tube | OD φ16mm | ||
Wire diameter | 0.3mm, 0.4mm,0.5mm. | ||
Thermocouple | Product model | Length | Insertin Depth | Graduation | Specification |
Single | WRB-120-T | 350 | 200 | S/ R /B | Φ16 |
Pt Rh30-Pt Rh6 | WRB-121-T | 400 | 250 | Φ25 | |
Double | WRB-120-T | 450 | 300 | Φ16 | |
PtRh 30-Pt Rh6 | WRB-121-T | 550 | 400 | Φ25 | |
single Pt Rh 10-Pt | WRS-120-T | 650 | 500 | Φ16 | |
WRS-121-T | 900 | 750 | Φ25 | ||
Double Pt Rh10-Pt | WRS-120-T | 1150 | 1000 | Φ16 | |
WRS-121-T | 1250 | 1100 | Φ25 |
Platinum-rhodium thermocouples are widely used in industrial production such as powder metallurgy, vacuum furnaces, smelting furnaces, steel-making furnaces, industrial salt bath furnaces, and sintering bright furnaces. They are usually used in conjunction with temperature transmitters, regulators, and display instruments. Form a process control system to directly measure or control temperature measurement in various production processes.
Product Advantage:
1: High temperature resistant ceramic base
2: Imported chip
3:Temperature resistance 0-2500 ºC
4: The installation method can be customized
5: Degrees fast response speed the installation
6: Micro Welding Technology
7. High accuracy,High quality temperature measuring wire
8. 99% corundum tube
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