B Type Thermocouple
Material Info, Temperature Specifications, Typical Application

Type B Thermocouple

Type B Thermocouple: An Introduction
The Type B thermocouple is applied in very high-temperature operation.
The Type B thermocouple is suited for use at up to 1800 °C. Accuracy and stability are extreme at very extreme temperatures. B Type is the only general-purpose thermocouple that it has the highest temperature limit when compared to other types of thermocouples. Type B produces weaker output than the other noble metals (type S or type R) at temperatures under 1,112°F (600°C). Type B thermocouples produce the same output at 0°C and 42°C, which makes them useless below about 50°C. At 21°C emf function has a minimum. We can easily perform cold-junction compensation since the compensation voltage is approximately fixed at normal room temperatures.

Composition:
Type B Thermocouple is composed of a
Positive leg- 70% Platinum, 30% Rhodium.
Negative leg- 94% platinum, 6% Rhodium.

Mineral Insulated Version
With appropriate outer sheath, Type B is usable from 600°C to 1700°C, (1100°C to 3050°F).

Type B Wire Grade:
Thermocouple Grade for B Type: 32°F - 3100°F (0°C to 1700°C)
Extension Wire: 32 to 212F (0 to 100C)

Accuracy :
Standard: +/- 0.5%
Special Limits of Error: +/- 0.25%

Type B Insulation Material:-
In Type B Thermocouple mainly two types of insulation are used.

Ceramic beads insulation
It is a lightweight insulating product. Main ingredients are high purity alumina-silicate. The material is low on thermal mass. This gives it low thermal conductivity and is an extremely effective insulation material. It can withstand a high temperature of 1700 °C so it is best-suited material for Type B thermocouple.

Compacted mineral insulation.
Magnesium Oxide has high dielectric strength, responds quickly to temperature changes and is very durable. It has standard Composition of the High-Quality MgO (About 97%) and 3% AI2O3(High Purity).
Magnesium Oxide insulation is recommended for B Type thermocouple. When Thermocouple is to be immersed in liquids, high moisture, corrosive gases or high pressures lead to early corrosion. This thermocouple can be used to reach otherwise unattainable areas.

TYPE K THERMOCOUPLE PROS AND CONS

Pros Cons
Excellent level of accuracy in extremely high temperatures. Provide least output emf per degree Celsius change in temperature.
Greatest temperature boundary of any of the thermocouples. Costlier than other types as Platinum alloys are used.
Stable and predictable voltage-generation. Can not be used for temperatures below 50°C.
Resistant to high-temperature oxidation. Slower response for measurements below 500°C.
High mechanical strength. Lower output compared to other noble elements (eg: type R/ type S) at 600°C or below.
Good pressure-resistant performance. Cannot be used for sub-zero temperature measurements.
Measures at a wide temperature range: Continuous: 200 - 1800°C, Short : 0 - 1850°C
Very fast response for higher temperatures (above 500°C)
Uses:
• Cement Processes and Incinerators
• High-Temperature Industries
• Hot Gas temperature measurements
• Inert and Oxidizing Applications

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