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Temperature can be measured with a variety of methods. Glass thermometers, resistance temperature devices (RTDs), bimetal instruments, gas expansion (gas-actuated) thermometers and infrared radiation, to name a few. Each offers a unique set of advantages for specific applications. Another extremely common temperature measurement device is the thermocouple. Its simple design makes it remarkably versatile, reliable and cost-effective. But how does a thermocouple work? This article will describe the function of thermocouples, the different types and their material composition.

Temperature sensors are key components in helping to ensure a safe and reliable application. RTDs and thermocouples both provide accurate and repeatable temperature measurements for your process. But, how do you know which sensor is the best one to use in your application?

Not every application is the same, so you need to get the right equipment for your specific needs. When it comes to temperature measurement, inaccurate readings can severely impact your process. So, how can you ensure you are correctly and reliably monitoring temperature?

Thermowells are essential to protecting your thermometer or temperature sensor in your high-pressure or high-temperature applications. They can protect your investment and keep your measurements accurate, no matter how extreme the environment. One of the top questions we receive here at Ashcroft from those in the temperature measurement industry is how to properly fit a thermowell. What measurements are needed? What is a u-dimension and how does it factor in? Many factors are at play, and it can be easy to get the wrong size if you aren’t paying attention.

I was recently involved in an industrial project for a client’s critical application that required RTDs and thermocouples. The buyer’s main concern seemed to be the cost, assuming that all temperature sensors probably cost the same.   However, not all applications are the same, and not all temperature sensors are created equal, so prices can vary. The prices of RTDs and thermocouples are determined by a number of factors, including the applications for which they’re being used and the temperatures in which they’re working.