Surface Mount Thermocouples — Ring, Magnet & Weld-Pad Types

Surface-Mount Thermocouple Contact Style

Surface-mount thermocouples put the sensing junction at the contact point using weld pads, ring terminals, magnets, or other attachment styles selected around the equipment surface.

Surface Thermocouple Configurations

Ring / Gasket Style Thermocouple

A ring or lug-type surface thermocouple bolted or clamped directly to a pipe, tube, or structural surface. The thermocouple junction is embedded in the ring base, ensuring consistent thermal contact at the mounting point. Available in ring (circular) and lug (rectangular tab) configurations.

Best for: Fixed monitoring points on piping and structural surfaces where welding is not permitted. Standard lug dimensions match common conduit and pipe clamp hardware.

Magnetic Surface Thermocouple

A thermocouple sensor with an integral permanent magnet base for temporary or portable surface temperature measurement on ferromagnetic (steel, iron) surfaces. Spring-loaded contact tip ensures consistent thermal contact even on slightly uneven surfaces. Rapid deployment — no tools required.

Best for: Maintenance, commissioning, and troubleshooting measurements. Motor housings, pipe OD, structural steel, and equipment frames. Operating temperature limit: 200°C continuous.

Weld-Pad Surface Thermocouple

A weld-pad thermocouple with a flat metal base pad designed to be TIG-welded to any metal surface. Once welded, provides permanent, tamper-proof contact between the junction and the measured surface. Low thermal mass enables fast response to surface temperature changes. Inconel or 316SS pad, MIMS extension cable.

Best for: Permanent pipe-surface, vessel-wall, and equipment-housing temperature monitoring. Heat exchanger tube-sheets and structural weldments in aerospace and power generation.