Mineral-Insulated-Metal-Sheathed, MIMS, MI Cable or MgO thermocouples. They are referred to by several names and are used in thousands of different applications. They are highly versatile sensors for use in process temperatures up to 2400°F (1315°C) and a wide range of atmospheres and conditions. Of all the thermocouple construction types, these are by far the most adaptable and configurable. A virtually limitless number of combinations of can be achieved with the many combinations of element type, insulation, sheath material, sheath diameter, junction type, accessories, and fittings.
MgO Thermocouples have a sheath is a seamless, hermetically-sealed metal tube, tightly packed with Magnesium Oxide powder. Thermocouple wires run through the metal tube parallel and isolated from each other suspended within the MgO powder which has a high dielectric strength. These thermocouples are durable, malleable & and have a quick response to temperature fluctuations. In addition, they are very flexible, easily bent and formed into shape. MgO cable can be bent at radii as small as 2X the outer sheath diameter with no signal or performance degradation.
The MgO sheath can be welded or brazed to a surface and provides shielding for the thermocouple wires inside, protecting them from Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI). This is in addition to the protection of the thermocouple wires from intense heat, cryogenic temperatures, oxidation, corrosion, moisture, thermal shock, and high pressure.
Lengths of MgO cable can also be used as extension wire in harsh environments.
CEL only supplies MgO thermocouples that meet or exceed special limits of error.
Cleveland Electric Laboratories builds MgO thermocouples to order as a stand-alone product or with added protection tubes, process fittings, transitioned to soft wire or in thermowells. Termination on the cold end includes industry-standard plugs/jacks, bare leads, terminal blocks, or protection heads. For the hot end, the junctions may be grounded, ungrounded or an exposed junction and can also be made with weld pads, screw terminals and others. These optional accessories are in stock and can be configured and built to suit your exact needs.
Metal-Sheath (MgO Thermocouples) Industrial Thermocouples
MgO Thermocouples are versatile, flexible sensors used in process temperatures ranging from -320F to 2400F. With an offering of calibrations, sheath materials, diameters, customer lengths and terminations, our customized MgO’s often serve as work/load sensors as well as for overall temperature uniformity of the furnace chamber.