Growing range of thermocouples, RTDs, and specialized sensor cabling

AutomationDirect’s line of ProSense process measurement devices now includes type J and type K thermocouples, more varieties of RTD sensors, and matching extension wire. Thermocouple probes with connection heads feature cast aluminum NEMA 4 screw covers with captive gasket and stainless steel chain. The 1/4 in. diameter probes are available with temperature sensing ranges of 32 to 1,330 °F (Type J), or 32 to 1,700 °F (Type K).


AutomationDirect ProSense temperature sensors.AutomationDirect has expanded its line of ProSense temperature sensors and accessories. The line now includes individual sensors, probes, housings, mounts, and specialized extension wire.

Thermocouple probes with connection heads feature cast aluminum NEMA 4 screw covers with captive gasket and stainless steel chain. The 1/4 in. diameter probes are available with temperature sensing ranges of 32 to 1,330 °F (Type J), or 32 to 1,700 °F (Type K). Welded-style probes, in 6, 12, and 18 in. lengths, are bendable to adapt to installation requirements; spring-loaded probes are available in 4, 6, or 12 in lengths.

Thermocouple welded and spring-loaded probes with 1/2 x 1/2 in. NPT hex nipples allow easy replacement of existing probes and easy connection to wiring junction boxes. Available in 6, 12, or 18 in. lengths, the 1/4 in. diameter welded style is bendable to adapt to installation requirements, while the spring-loaded style provides positive tip contact in thermowells.

Available thermocouple probes with pre-attached plugs feature 1/8 or 1/4 in. diameter sheaths in 6, 12, or 18 in. lengths; thermocouple probes with lead wire transition come with a 6 ft. heavy-duty lead wire. Temperature sensing ranges are 32 to 970 °F or 32 to 1,330 °F (Type J) and 32 to 1,700 °F (Type K).

Type J or K thermocouple adjustable immersion sensors, ideal for plastics processing applications, feature a 32 to 900 °F temperature range and 4, 6, or 10 ft. lead wires; the spring and armor adjustable styles allow for variable immersion depths.

Bolt-on ring sensors are ideal for nozzles, extruder barrels, die heads, molds, and other surface-mount sensing applications. Thermocouple bolt-on ring sensors cover a 32 to 900 °F temperature sensing range. RTD bolt-on ring sensors cover a -58 to 572 °F sensing range.

RTD probes feature 1/4 in. diameter stainless steel sheaths with 100 ohm platinum three-wire elements. With a temperature sensing range of -58 to 572 °F, the probes are available in 6, 12, or 18 in. lengths. Models available include welded and spring-loaded probes with cast aluminum NEMA 4 connection head and captive gasket, 3/4 in. NPT conduit opening and stainless steel cover chain; probes with 1/2 x 1/2 in. NPT hex nipples are available in welded and spring-loaded styles, allowing for easy replacement of existing probes and connection to wiring junction boxes. Also available are probes with pre-attached three-pin plugs for quick wiring connection, as well as probes with lead wire transition, or M12 connections.

ProSense RTD sanitary clean-in-place probes are designed to meet the stringent requirements of HTST pasteurization systems. These 4 in. probes are available in the standard 1/4 in. diameter, or with a 3/16 in. diameter reduced tip for greater durability in high-viscosity applications. The stainless steel probes have a -58 to 400 °F temperature sensing range.

Two-conductor thermocouple extension wire for types J and K, in standard ASTM/ANSI colors, is available in 50 and 100 ft. lengths. Also available is RTD extension wire which offers superior performance compared to generic off-the-shelf cable, in 50 and 100 ft. lengths.

Accessories for thermocouples and RTDs include thermowells, compression mounting fittings, bayonet adapters, and connectors.

Edited by Peter Welander, pwelander(at)

Also read A Closer Look at RTDs.

Also read Understanding the Tricky Thermocouple.

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