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Mineral Insulated (MgO) Thermocouples

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MgO thermocouple assemblies are metal sheathed, magnesium oxide insulated temperature sensing elements. These small, compact units are moisture proof, non-porous, and pressure resistant. They are available with single or dual elements and are noted for accuracy and fast response.

MgO thermocouple assemblies are available in a variety of sheath materials and all ANSI calibrations. Installation is made easier because MgO thermocouple assemblies are bendable to practically any contour. The metal sheath is made of durable alloys and can be welded.

MgO thermocouple assemblies have consistency that is assured by excellent quality control in manufacturing.

Multipoint thermocouples with one or more measuring junctions set at specific distances from tip are available. Please contact Furnace Parts for assistance with multipoint assemblies.


Item #

Sheath Diameter

Maximum Temperature

Thermocouple Temperature Range

Thermocouple Standard Limits of Error

Thermocouple Special Limits of Error

Type of Material

063-J-304-U 1/16 in 1650 ºF 32 to 1400 ºF ± 4 ºF
± 0.75 %
N/A 304 SS
063-JSL-304-U 1/16 in 1650 ºF 32 to 1400 ºF N/A ± 2 ºF
± 0.4 %
304 SS
063-J-304-G 1/16 in 1650 ºF 32 to 1400 ºF ± 4 ºF
± 0.75 %
N/A 304 SS
063-JSL-304-G 1/16 in 1650 ºF 32 to 1400 ºF N/A ± 2 ºF
± 0.4 %
304 SS
063-J-304-E 1/16 in 1650 ºF 32 to 1400 ºF ± 4 ºF
± 0.75 %
N/A 304 SS
063-JSL-304-E 1/16 in 1650 ºF 32 to 1400 ºF N/A ± 2 ºF
± 0.4 %
304 SS
063-J-316-U 1/16 in 1700 ºF 32 to 1400 ºF ± 4 ºF
± 0.75 %
N/A 316 SS
063-JSL-316-U 1/16 in 1700 ºF 32 to 1400 ºF N/A ± 2 ºF
± 0.4 %
316 SS
063-J-316-G 1/16 in 1700 ºF 32 to 1400 ºF ± 4 ºF
± 0.75 %
N/A 316 SS
063-JSL-316-G 1/16 in 1700 ºF 32 to 1400 ºF N/A ± 2 ºF
± 0.4 %
316 SS
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