Mineral-Insulated Metal-Sheathed — MIMS Thermocouples

MIMS Construction for Harsh-Duty Service

MIMS thermocouples place the conductors inside compacted mineral insulation and a continuous metal sheath, giving engineers a bendable, vibration-resistant probe for high-temperature or tight-routing applications.

In-House MIMS Manufacturing Process

Cable Procurement & Incoming QC

MIMS cable is purchased to ASTM E585 dimensional requirements. Incoming inspection verifies OD, wall thickness, insulation resistance, and EMF conformance by lot certification.

Cut-to-Length & Straightening

Cable is cut to the customer-specified length with a precision abrasive cutoff. Straightening is performed on a roller-leveler for assemblies that require tight positional tolerances in fixtures or test hardware.

Tip Formation & Junction Welding

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.

Bending & Forming

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.

Termination & Head Attachment

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.

Final Inspection & Calibration

100% dimensional inspection, insulation resistance test, continuity check, and EMF verification. Calibration certificates issued per customer requirement. Full AS9100D first-article documentation available.