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Type B Thermocouple - Temperature Sensors / Probes



Type B - Platinum-30% Rhodium vs Platinum-6% Rhodium

 Thermocouple Type B was developed in the 1950’s and this thermocouple is also defined in ASTM E-230. It can be used continuously up to 1,600°C and intermittently up to around 1,800°C. In other respects the device resembles the other rare metal based thermocouples, Type S and Type R, although the output is lower, and therefore it is not normally used below 600°C. An interesting practical advantage is that since the output is negligible over the range 0°C to 50°C, cold junction compensation is not normally required.

Type B Thermocouples - Typical Constructions and Styles

Ceramic Twin Bore
Insulated Thermocouples
Type B Thermocouple CeramicSuitable for general use and replacement elements for industrial and high temperature thermocouples.
Ceramic Sheathed with IP67 die cast alloy head Type B Thermocouple Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies Ceramic Sheathed with IP67 heavy duty cast iron head Type B Thermocouple Weatherproof cast iron screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies Metal Sheathed with IP67 die
cast alloy head
Type B Thermocouple Weatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies
Metal Sheathed with IP67 heavy duty cast iron head Type B Thermocouple Weatherproof cast iron screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies

AMS2750 Approved Type B Thermocouples for Vacuum Furnaces

with
Miniature Plug
Type B Thermocouple  with mini plug fitted with a miniature thermocouple plug rated to either 428°F, 572°F, 797°F or 1112°F
with
Miniature Jack
Type B Thermocouple  with mini jackfitted with a miniature thermocouple socket rated to either 428°F, 572°F, 797°F or 1112°F
with
Standard Plug
Type B Thermocouple  with standard plugfitted with a standard thermocouple plug rated to either 428°F, 572°F, 797°F or 1112°F
with
Standard Jack
Type B Thermocouple  with standard jackfitted with a standard thermocouple socket rated to either 428°F, 572°F, 797°F or 1112°F
with Standard IP67
die cast head
Type B Thermocouple  with die cast headWeatherproof die cast alloy screw top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies
with Form 'A'
Flip Top die cast head
Type B Thermocouple  with flip top head Weatherproof Form 'A' die cast alloy flip top terminal head with ceramic terminal block. Suitable for simplex and duplex assemblies

Type B - Technical Data

Conductor Combination Approximate generated
EMF change in µV
per ºC change
(referenced to 0ºC) at:
Approximate Working
Temperature Range
Initial Calibration Tolerances to ASTM E-230
(whichever is greater)
Thermocouple Output Tolerances
to IEC 60584-1
+ Leg - Leg 100ºC 500ºC 1000ºC ºF ºC Standard Special Type Class 1 Class 2 Class 3
Platinum - 30% RhodiumPlatinum - 6% Rhodium 1 5 9 1600 to 3100 870 to 1700 ±0.5% ±0.25% Temperature Range
Tolerance Value
Temperature Range
Tolerance Value
–


–

600°C to 1700°C
±0.0025 ⋅ [t]
600°C to 800°C
±4.0°C
800°C to 1700°C
±0.005 ⋅ [t]
1. The tolerance is expressed either as a deviation in degrees Celsius or as a function of the actual temperature.
2. Thermocouple materials are normally supplied to meet the tolerances specified in the table for temperatures above –40 deg C. These materials however, may not fall within the tolerances for low temperatures given under Class 3 for Types T, E and K thermocouples. If thermocouples are required to meet limits of Class 3, as well as those of Class 1 and/or Class 2, the purchaser should state this, as selection of materials is usually required.

What Color is Type B Thermocouple Wire?

IEC 60584-3 provides tolerances and identification for a common international system for thermocouple wire identification and tolerances based essentially on thermoelectric emf as opposed to a datum of the emf of the thermo elements against platinum. Tolerances are defined as the maximum allowable deviation in microvolts, caused by the introduction of extension or compensating extension wire into the circuit. Color codes and tolerances are well established in the United States and have been in use as a national standard for years. In other parts of the world, there are alternative color code systems and tolerances, either in use, or in the process of being implemented. One such color code system is that established by the IEC.

In the United States, color codes and tolerances are defined in ANSI 96.1 (1982) and ASTM E-230. Extension wire and compensating extension wire is indicated with the letter “X” after the thermocouple type per these standards. The color code for thermocouple grade wire includes a brown overall jacket whereas the color code for thermocouple extension wire typically includes an overall jacket in the color of the positive wire. For some insulations, colors may appear as a stripe or trace strand. High temperature braided insulation is not normally color coded.

The table below shows the color coding adopted by the ASTM and IEC.

ANSI MC96.1 United StatesInternational Color Code
to IEC 60584-3
Redundant national colors
Thermocouple Grade Extension Grade BS 1843 DIN 43714
-ANSI MC96.1 Type B ExtensionIEC60584-3 Type B Thermocouple -DIN 43714 Type B Thermocouple

Please click here for all thermocouple wire colour codes.

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Thermocouple Sensors
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Miniature Thermocouple Connectors
Mini Thermocouple Connectors – 410ºF Rated
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Standard Thermocouple Connectors
Standard Thermocouple Connectors – 410ºF
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