Thermocouples are one of the most popular kinds of temperature sensors on the market – probably because they’re reliable and extremely affordable.
Available in many different forms, including K-type and J-type, they’re extremely helpful in helping measure scorching hot temperatures of up to 1260◦C.
K-type thermocouples, for example, can last anywhere between just a couple of hours or for years to come – and many factors can affect their efficiency and overall lifespan.
Some of the most effective ways you can prolong the life of your K-type thermocouple are outlined in this post.
- Select the most appropriate thermocouple
While K-type thermocouples are the most popular type of thermocouple, this isn’t to say that they’re the best match for every project.
The letter refers to the metal combination (in this case nickel and copper) which is a good indication of its maximum working temperature and its accuracy.
A K-type probe is suitable for high-temperature applications of up to 1260◦C. In contrast, other types, like their J counterparts, are better suited to lower-temperature applications.
Remember: it’s always best to do your research before you make your purchase.
- Think about immersion depth carefully
Heat conducted away from the junction (where two wires are welded together, and temperature is measured) can often lead to inaccurate temperature measurements. This is why it’s important to consider immersion depth very carefully.
Ideally, it should be used at a depth of at least 10 times its outside diameter.
Keep this in mind when selecting your probe length, making sure to purchase the one that best meets your requirements.
- Avoid changing the depth
Once your K-type thermocouple is already installed at a particular immersion depth, you need to make sure it stays there.
If you make any changes to its positioning, it could alter the output and lead to inaccurate temperature readings.
If you need to check your thermocouple, it’s a good idea to do it whilst it’s in place.
If you need to remove it for any reason, take great care when reinserting it – either at its exact depth or even deeper to steer clear of any errors.
- Account for the effects of heating cycles
Thermocouples, specifically K-type thermocouples, are designed for use at a single or progressively higher temperature – this is when they’re most accurate.
However, if they need to be used across a continuous cycle of temperatures, there are steps you can take to reduce the likelihood of errors.
For instance, you should conduct regular checks of your equipment to make sure your thermocouple stays in optimum condition.
- Check them periodically
To some, this might seem obvious, but you should be checking your K-type thermocouple regularly, keeping an eye out for signs of damage.
You should be doing this at least once a month, looking for indications of excessive corrosion, oxidisation, and general wear and tear.
Purchase high-quality K-type thermocouples online
Ready to purchase K-type thermocouples?
Be sure to get in touch with a specialist, like Cartridge Heaters, in your area for expert advice and recommendations – they’d be more than happy to help.
Why not order online, and have K-type thermocouples delivered directly to your door?
Remember, always purchase temperature sensing products from a supplier you know you can trust, so you can be confident you’re getting the highest quality products.