Style MTA3 is a mineral insulated (MI) cable thermocouple assembly with open disc termination, available in sheath diameters from 0.063" to 0.250" in single or duplex construction. It features nickel-plated brass inserts and ceramic or silicone/fiber disc terminations with mounting plates. Junction types include grounded, ungrounded, and exposed, each suited for different environmental conditions. Sheath materials are Alloy 600 (max 2150°F), 304 SS, or 316 SS (both max 1650°F). The assembly is moisture-proof, thermally shock-resistant, and can be formed around a mandrel four times the sheath diameter. Standard calibrations are J, K, E, T, N, R, S, and B per ANSI, with lead lengths up to 10 feet and corresponding tolerance specifications.