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Watlow provides over 85 years of manufacturing, research and product development for your temperature sensing needs. Watlow manufacturers a tremendous selection of general application, mineral insulated metal sheathed, base metal, high temperature, surface temperature and multipoint thermocouples are available. Fiberglass insulated thermocouples are capable of temperatures up to 900°F (480°C) for continuous operation. Watlow provides grounded, ungrounded and exposed junctions. Watlow uses a verification process at selected temperature points to products conform to ASTM error limits. Same day delivery on millions of thermocouple configurations is available.

Product Description Temperature Outside Diameter
°F °C in. mm
General Applications Tube and Wire Fiberglass and Teflon insulated leads for industrial and commercial equipment. Lead lengths 6 to 360 in. (152 to 9,144 mm) and standard sheath lengths up to 12 inches. J, K, T and E calibrations available. up to 900 up to 480 .125, .1875 or .25 3.2, 4.8 or 6
Mineral Insulated Fast-responding, durable and capable of handling high temperatures with the use of XACTPAK® metal sheathed cable with compacted MgO insulation. up to 2200 up to 1200 0.01 to 0.5 0.25 to 13
EXACTSENSE™ Combines rugged thermocouple technology with signal conditioning into one package. The primary benefits are high accuracy, durability, quick response, and high temperature. -104 to 2192 -40 to 1200 0.083 to 0.188 2.1 to 4.8
Base Metal Large gauge bare alloy available with ceramic insulated elements and protection tubes. Available in ASTM E 230 Types K and J. up to 2300 up to 1260 13, 19, 21, 25, 26.7, 33.4 or 41.3 0.5, 0.75, 0.84, 1.0, 1.05, 1.315 or 1.625
High Temperature / Platinum Available in ASTM E 230 Types S, R or B with a variety of high temperature sheath materials capable of withstanding high temperatures. up to 3100 up to 1700 1.6 to 6.4 0.063 to 0.25
MICROCOIL™ Surface temperature measurement up to 1292 up to 700 0.125 3.2
Radio Frequency Thermocouple Reads surface temperature measurement through radio frequency energy. Highly conductive material provides quick response time. Available in type E, J or K calibration. up to 932 up to 500 0.19 5
True Surface Thermocouple Flat surface temperature sensor that isolates the thermocouple from ambient airflow. Typically achieved accuracy and repeatability of one to two percent (ΔT). Fits into corners and other tight locations easily, 0.44 in. (11.9 mm) wide by 1.4 in. (35.5 mm) long by 0.25 in. (6.35 mm) thick. up to 400 up to 200 n/a n/a
Multipoints Accurately measures temperatures at various locations. Constructed of a variety of protecting tubes with XACTPAK mineral insulated metal sheathed cable. up to 2200 up to 1200 0.125, 0.1875 or 0.25 3.2, 4.8 or 6