Installation thermocouple

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Moisture can cause corrosion and decalibration in some thermocouple wire for instance, the positive leg of a J thermocouple is iron, and will readily rust. Take care to prevent moisture buildup at thermocouple wire terminals.

You must be logged in to post a comment. Home Forum Tool Contact Us. Facebook Twitter Linkedin Youtube. Primary Menu AutomationForum. Search for: Search. Home Temperature Measurement How to install a Thermocouple in to a process?

Interface level measurement techniques. Different types control valve actuators. Related posts. However, setting up new TCs, specifically dedicated to recording roast profiles, is arguably the easiest and least complicated approach to start using RoastLog.

Whether these will be the first TCs installed on your roaster or if you plan to install new TCs alongside existing ones, the process is the same:. Invariably, the question of where to install a new thermocouple has to be addressed. There isn't really one definitive answer for this since roasters can vary drastically between different makes and models. However, there is a general location which you should aim for regardless of the roaster. This can be best shown in a photo:.

General location for a thermocouple installation. Photo of a Probat P In this photo, we can see that the drum rotates clockwise and creates a bean curtain approximated by the green shaded area. To get a good measurement of what the beans are experiencing, the thermocouple should be placed well within the bean mass.

It should be obvious from the photo that if the thermocouple was installed higher up on the face of the roaster, there is a chance the TC would not be immersed in the bean mass while roasting smaller batch sizes. In this case, the TC was installed directly in the door and is merely one of many options. When determining the appropriate location for your probe, take into consideration the location of the curtain, drum rotation direction and location of the fins inside the drum.

This hole will ultimately be tapped to accept the compression fitting which will hold the thermocouple in place. As such, you need the correct drill bit and tap. We happen to keep a small stock of these on-hand as well.

Drilling can require healthy doses of patience, especially when drilling through steel. We can supply all of these tools and parts, if needed.

When splicing thermocouples into an existing application, keep in mind that:. Omega does not recommend that thermocouple wires be soldered. With the exception of the Type T copper leg, thermocouple alloys do not solder easily. It is possible to solder these materials, but very aggressive flux is typically needed to remove oxides from the surfaces during soldering.

If soldering is done, then it is important that the flux is completely cleaned from the wires, and a close inspection for cold solder joints is made. The conductors in Type C thermocouples will readily oxidize when exposed to soldering temperatures in the presence of oxygen. When thermocouple cables must be extended, Omega suggests the use of thermocouple connectors or other mechanical means.

This helps to insure that the polarity is maintained since the connectors have the polarity marked on them , thermocouple connectors are keyed to insure that they only go together in the correct manner.