A thermocouple probe consists of thermocouple wire housed inside a metal tube. The wall of the tube is known as the probe sheath. Common casing materials include stainless steel and Inconel.
Inconel is compatible with higher temperature ranges than stainless steel; however, stainless steel is often preferred due to its broad chemical compatibility. For very high temperatures, other exotic casing materials are available. See our line of Exotic High Temperature Thermocouple Probes.
The thermocouple probe tip is available in three different styles. Grounded, ungrounded and exposed. With a grounded tip the thermocouple is in contact with the wall of the sheath. A bond to ground provides a fast response time but is more susceptible to electrical ground loops. In ungrounded junctions, the thermocouple is separated from the sheath wall by a layer of insulation. The tip of the thermocouple protrudes from the wall of the sheath with an exposed junction. Exposed junction thermocouples are best for air measurement.

Description
Rugged transition junction probes provide convenient termination to PFA-jacketed lead wires. The length of the stress reduction spring transition joint probes is 66 mm (2.6 "). The joint diameter is 6.4 mm for 1.5 and 3 mm diameter probes, and 9.7 mm for 4.5 and 6mm diameter probes.
Thermocouple sensor - Housing: Stainless Steel Probe with 1 / 2NPT compression fitting, Stainless Steel Probe with 1 / 4NPT compression fitting, Stainless Steel Probe with 1 / 8NPT compression fitting, Stainless Steel Probe with 3 / 4NPT compression fitting, Stainless steel probe with 3 / 8NPT compression fitting

thermocouple surface probe

Measuring the temperature of a solid surface is difficult for almost all types of temperature sensors. In order to ensure continuous measurement, the entire measurement area of the sensor must be in contact with the surface. This is difficult when working with a rigid sensor and a rigid surface. Since thermocouples are made of malleable materials, the junction can be shaped flat and thin to provide maximum contact with a solid, rigid surface. These thermocouples are an excellent choice for surface measurement. The thermocouple can even be incorporated into a rotating mechanism, making it suitable for measuring the temperature of a moving surface.

Insulated, ready-to-use thermocouples

Insulated thermocouples are one of the most popular styles for general use. They are supplied in packs of 5 and there are 4 different models listed on this page:

RTC with a miniature size thermocouple plug and thermocouple wire strain relief.
SC has a miniature size thermocouple plug with an integral wire caddy for thermocouple wire storage.
RTC with a standard size thermocouple plug and thermocouple wire strain relief.
LSC has a standard size thermocouple plug with an integral wire caddy for thermocouple wire storage.

All models are available with 1 or 2 meters of cable length and 3 types of cable insulation: Kapton and PFA provide good protection against moisture and abrasion resistance and are rated for maximum working temperatures of 315 ° C and 260 ° C respectively. Fiberglass is designed for a maximum service temperature of 480 ° C. Wire diameters of 0.08, 0.13, 0.25, 0.5 and 0.8mm are available. Smaller diameters have a faster response time, while large diameters are more durable.

Examples of the most popular models are shown under "Pricing and Availability". We have many other models available in stock, please consult the technical sheet in pdf that has all the models or use the "Reference Builder" to see the price and availability of the model you require.

Thermocouple thermometer	Compensation wire thermocouple	Blade type armored thermocouple