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TC0933 Platinum-Rhodium Thermocouple Wire (Pt-Rh)

Catalog No. TC0933
Material Type R, Type S, Type B
Form Wire
Synonyms Platinum-Rhodium Thermocouple Wire, Pt-Rh TC Wire
Temperature Range Up to 1704°C
Diameter 0.001 to 0.032"
MSDS/SDS

Platinum-Rhodium (Pt-Rh) Thermocouple Wire is a high-temperature sensing wire, made from platinum and rhodium alloys.

Platinum-Rhodium (Pt-Rh) Thermocouple Wire is on sale at Stanford Advanced Materials (SAM). With rich knowledge and experience in this field, SAM is a leading thermocouple wire supplier and has been providing quality Platinum-Rhodium Thermocouple Wires for years.

Related products: Platinum Wire.

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Material
Type R, Type S, Type B
Form
Wire
Synonyms
Platinum-Rhodium Thermocouple Wire, Pt-Rh TC Wire
Temperature Range
Up to 1704°C
Diameter
0.001 to 0.032"
 
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Dimensions
Dia.: > 0.01 mm, or customized
Material
Platinum (Pt)
Purity
Pt ≥ 99.95%
Standard
ASTM B561
Synonyms
Platinum Wire, Pt Wire
 
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Material
(+)70% Pt, 30% Rh, (-)94% Pt, 6% Rh
Diameter
0.5mm ± 0.015mm, customized
Operating Temperature
0 °C -1800 °C
Synonyms
Type B Thermocouple Wire, Pt-30Rh/Pt-6Rh Wire
 
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Material
Pt-Pt90Rh
Diameter
0.5mm ± 0.015mm, customized
Operating Temperature
0 °C -1800 °C
Synonyms
Type S Thermocouple Wire, Pt-10Rh/Pt Wire

FAQ

Our process requires the most accurate and stable temperature readings possible above 1200°C. Why is a Pt-Rh thermocouple often specified over other high-temperature types?

Above 1200°C, Pt-Rh thermocouples (especially Types S, R, and B) are considered the gold standard for precision due to their exceptional stability, repeatability, and resistance to oxidation. Unlike base metal thermocouples, whose drift becomes significant, or Type K which becomes unstable, noble metal Pt-Rh alloys maintain their EMF (voltage-to-temperature) characteristics with minimal drift over time in clean, oxidizing atmospheres. This makes them critical for applications like calibration labs, high-temperature heat treatment furnaces, and glass melting where ±1°C accuracy matters.

We operate a ceramic sintering furnace that runs at 1550°C in air. Which type—S, R, or B—is the best fit, and why?

Type B (Pt-30%Rh / Pt-6%Rh) is almost certainly the correct choice for this application. Here's the breakdown:

  • Type S & R: Their maximum continuous use temperature is typically rated around 1480°C. Running them at 1550°C will drastically accelerate grain growth and drift, leading to rapid calibration failure and short lifespan.
  • Type B: Specifically designed for measurements above 1600°C. Its higher rhodium content in both wires provides superior mechanical strength and reduced vapor pressure loss at these extreme temperatures, offering reliable and longer-lasting operation at your 1550°C setpoint.

We need to measure temperature in a reducing atmosphere (e.g., containing hydrogen or carbon monoxide). What is the critical risk with standard Pt-Rh wire, and how is it mitigated?

The critical risk is rapid and catastrophic failure due to "rhodium migration" and embrittlement. In reducing environments, rhodium from the positive leg can volatilize and contaminate the pure platinum leg, forming a brittle alloy that breaks easily. The standard mitigation is to use a dedicated, gas-tight ceramic protection tube (e.g., high-purity alumina) that fully seals the wire from the process atmosphere. For severe conditions, a secondary insulating sheath within the tube may be required. Never expose bare or inadequately protected Pt-Rh wire to reducing gases.

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