If you do more research on thermocouple types, you will find out that they are available in different calibrations and metal combinations. They are sensors used for measuring temperatures. They contain some two kinds of metals that have been joined together at some point. If these metals are heated or cooled, a voltage is generated.
Owing to the difference in combination of metals or calibrations, these devices can be categorized in four kinds. The most common calibrations are J, K, T and E, but there are also other kinds that have higher temperature calibrations and are grouped as R, S, C, and GB. Each specific calibration can only measure up to s certain temperature range, but the highest temperature that a given type will measure is determined in greater part by the thickness of the wire used, which basically means that even if a thermocouple has a high range, it may not record its maximum temperature if it is made using a very thin wire.
There are mainly three kinds of these temperature devices, and the simplest one is the beaded wire thermocouple. This type consists of pieces of wires connected together with a welded bead. It has several limitations to its uses, mainly because the beads are exposed.
It is not suitable for use to measure the temperature of liquids, which could oxidize or corrode the alloy of which it is made. In addition, measurement is compromised by its indirect connection with a metallic surface. In short, this temperature-measuring device is only suitable to measure the temperatures of gases.
Make sure that the type that you are just about to choose can put up with many chemical conditions. This is to mean that they must. Be chemical resistant. Choose that which can suit what you want it for make sure that you look keenly at the vibration and abrasion of each thermo device if you want to choose the thermostat that you will install on your own make sure that you check at the size of the holes that you will installed in.
The third and the last type of these temperature-measuring devices is the surface probe. They are considered the best in measuring the surface temperatures, because, unlike most other types, it is in complete contact with surfaces of the substances it measures. It is also preferred in measuring surfaces, which are in motion, as it can be made in a way that it rotates.
There are important things that one need to onside r before buying a thermocouple, and the most important one is the range of temperature that a particular device can measure. Another equally important factor to be aware of is the degree of chemical resistance of a given measuring device or the sheath material of which it is made. Lastly, it is important to consider the resistance of a measuring device to abrasion and vibration, and the general installation requirements.
It is also of significant importance to know just the right type of junction to go by and they normally come in three groups: exposed, grounded and ungrounded. These types of junctions are important in their own ways as some offer excellent response time while others will give good electrical isolation. In short, when it comes to thermocouple types, one need to choose according to what they will use it for.
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Author: Lenore BoltonThis author has published 2 articles so far.