A thermocouple probe is a popular choice for temperature measurement. These devices are simple to use, low-cost durable sensors for temperature measurement. The fact that these thermal measuring devices provide such a broad measuring range with accurate readings makes it even more evident why they are used more than any other temperature sensor. A thermocouple probe also allows you to measure surfaces that are not cmletely linear with ease.
A thermocouple probe is made up of thermocouple wire inside of a metal cube. The cube wall is what is called the sheath of the probe. Sheath materials are most often made out of stainless steel or Iconel. The Iconel material can stand up to higher temperatures better than the stainless steel. However, stainless steel is often favored because of its chemical compatibility. There are other more exotic sheath materials to choose from as well.
It can be pretty difficult for many sensors to measure a solid surface. The sensor's complete measuring area should be able to contact the surface. This makes using a ridgid sensor on a ridgid surface very difficult. Lukily, thermocouples are made of flexible metal with a flat, thin junction so that the sensor can make full contact with an object's surface easily. This unique design makes thermocouples erfect for surface measurement.
The tip of the thermocouple probe is available in three different styles: grounded, ungrounded and exposed. A grounded tip of the probe has direct contact with the sheath wall. A grounded junction provides a quick response time, but it much more vulnerable to electrical ground hoop. Then there are grounded junctions, where the thermocouple has a layer of insulation separating it from the sheath. Exposed junction thermocouples are better for air measurement.
Thermcouples are available in a variety of combinations and calibrations. The most common are J,K, T and E. The diameter and the wire gauge determine the calibration. Even though thermocouples are widely used in many different industries, it helps to know what to look for when choosing one. First, you should check to make sure the thermocouple probe has a broad enough range of temperature measurement, make sure the sheath offers effective protection against chemical damage. If the thermocouple probe is being used in an industrial environment, it should b e able to withstand a corrosive environment, and you should understand all of the installation requirements.
You will find thermocouple probes with a sheath can be found in three different junction types: grounded, ungrounded and exposed. On the tip of the grounded thermocouple problem the thermocouple wires are directly attached to the inside of the probe wall. This set up provides good heat transfer from the outside, through the probe wall and back to the thermocouple. An ungrounded probe has the thermocouple detached from the probe wall. The result is a slower response time than the grounded style. Finally, the ungrounded type of probe provides electrical isoloation.
The engineering team at DeVale have been very helpful with their guidance and support through our product design stage. We have not seen that level of support from any company in their industry.
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