MIMS thermocouples combine MgO mineral insulation, metal-sheathed containment, and swaged construction to produce sensors capable of withstanding extreme temperature, pressure, vibration, and bending loads unavailable to conventional wire-in-tube assemblies.
| Parameter | Specification |
|---|---|
| Insulation Material | Magnesium Oxide (MgO) — high-purity grade |
| Sheath OD Range | 0.020" (0.5 mm) to 0.500" (12.7 mm) |
| Sheath Wall Thickness | 5–15% of OD (standard per ASTM E585) |
| Sheath Materials | 316 SS · 304 SS · Inconel 600 · Inconel 625 · Alloy 825 · Titanium Grade 2 |
| Thermocouple Types | K, J, T, E, N (base metal) · R, S, B (noble metal) |
| Conductor Count | Simplex (1 pair) · Duplex (2 pairs) |
| Junction Style | Grounded · Ungrounded · Exposed |
| Tip Closure | Swaged · Welded end cap · Hermetic brazed seal |
| Insulation Resistance | >1000 MΩ·cm at 20°C (new); >1 MΩ at max operating temp |
| Minimum Bend Radius | 2× OD (standard annealed) · 3× OD (un-annealed) |
| Pressure Rating | To 5000 PSI with appropriate end fittings |
| Max Operating Temperature | To 1260°C (Type K, 316SS sheath) · To 1480°C (Type R/S, Pt sheath) |
Magnesium oxide maintains high dielectric strength at elevated temperatures, is chemically inert, and transfers compressive load during swaging without cracking. It provides insulation resistance >1 GΩ at room temperature while allowing the assembly to be formed to complex geometries.
MIMS cable purchased to ASTM E585 dimensional requirements. Incoming inspection verifies OD, wall thickness, insulation resistance, and EMF conformance per lot certification.
Cable cut to customer-specified length with precision abrasive cutoff. Straightening performed on roller-leveler for assemblies requiring tight positional tolerances in fixtures or test hardware.
Tip swaged to close-ended or open-ended profile. Hot junction formed by TIG or resistance welding of thermocouple conductors. Grounded junctions welded to the inner sheath wall. Ungrounded junctions left insulated within MgO.
Assemblies formed to customer print geometry using CNC tube benders or hand-forming over mandrels. Annealing performed after tight-radius bends to relieve residual stress and restore ductility.
Cold end stripped, conductors identified, and terminated per customer requirement: flying leads, miniature connectors, standard connectors, or transition to extension wire in a connection head.
100% dimensional inspection, insulation resistance test, continuity check, and EMF verification. Calibration certificates issued per customer requirement. Full AS9100D first-article documentation available.
Talk directly to the engineering team that builds your assemblies. No bots, no call centers.