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WRB-130B Double Platinum Rhodium Thermocouple

The thermocouple has a very small thermoelectric potential at room temperature (-2 μ V at 25 ℃ and 3 μ V at 50 ℃), so compensation wires are generally not needed during measurement, and the influence of temperature changes at the reference end can be ignored. Its long-term usage temperature is 1600 ℃, and its short-term usage temperature is 1800 ℃. The melting point of platinum rhodium 6 alloy is 1820 ℃, which limits its upper temperature limit for use. The electromotive force rate of the dual platinum rhodium thermocouple is relatively small, therefore, a display instrument with high sensitivity is required.

B-type thermocouples are suitable for use in oxidizing or neutral atmospheres, and can also be used for short-term use in vacuum environments. Even when used in reducing atmospheres, their lifespan is 10-20 times that of R and S-type thermocouples. Due to the phenomenon of platinum rhodium diffusion from the positive electrode to the negative electrode of R and S type thermocouples at high temperatures, the thermocouples will deteriorate. In order to prevent this phenomenon from occurring, rhodium is added to platinum to make a platinum rhodium alloy. This not only improves the heat resistance, but also increases the alloy's thermal electromotive force on platinum. When the rhodium content is below 20%, the thermoelectric potential of platinum rhodium alloy on platinum increases sharply, but beyond this value, there is little change with the increase of rhodium content, and it significantly hardens, making processing difficult. Therefore, the rhodium content in this type of alloy cannot exceed 40% by weight.

The grain length of platinum rhodium alloy tends to be smaller than that of pure platinum, and decreases with the increase of rhodium content, which can make the thermoelectric performance more stable and the mechanical strength higher. Therefore, dual platinum rhodium thermocouples have been widely used in high-temperature measurements at 1800 ℃. The division mark of the dual platinum rhodium thermocouple used to be LL-2, but now it is B

WRR-130/WRB-130B type platinum rhodium 30 platinum rhodium 6 double platinum rhodium thermocouple composition

WRR-130/WRB-130B platinum rhodium 30 platinum rhodium 6 double platinum rhodium thermocouple has no special requirements, and the thermocouple protective sleeve is a 16mm diameter corundum tube.
Special sleeves include: high-temperature resistant alloy tubes, wear-resistant alloy tubes, silicon carbide tubes, silicon nitride tubes, etc.
The thermocouple core is made of national standard wire, with high accuracy, long service life, and a measurement range of 0-1800 ° C.

WRR-130/WRB-130B Platinum Rhodium 30 Platinum Rhodium 6 Double Platinum Rhodium Thermocouple Application Scenarios

Platinum rhodium thermocoupleSuitable for high-temperature applications in various production processes, widely used for temperature measurement in powder metallurgy, sintering bright furnaces, vacuum furnaces, smelting furnaces, glass, steelmaking furnaces, ceramic and industrial salt bath furnaces, etc.

B-type thermocouple (platinum rhodium thermocouple)

WRR-130/WRB-130B Platinum Rhodium 30 Platinum Rhodium 6 Double Platinum Rhodium Thermocouple
consist of

Platinum rhodium is a traditional temperature measuring element with stable thermoelectric properties and strong oxidation resistance. Its long-term use temperature is 1600 ℃ and short-term use temperature is 1800 ℃. The platinum rhodium thermocouple adopts a double-layer 99 corundum protective sleeve on the outside and high-purity platinum rhodium alloy wire on the inside, which has high temperature resistance, accurate temperature measurement, and high precision.Customizable special protective tubeTo meet practical usage requirements.

Model and specifications

1) Thermocouple Level I ordered according to the agreement;

2) The non embedded part is made of carbon steel.

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