Blog

Thermocouples (TC) and Resistance Temperature Detectors (RTD) are widely used for temperature measurement in process industries across the globe. However, in many cases, the sensor is located far from the measuring point. In these instances, cables are needed to transfer the signal. The challenge is to select the correct extension cables to maintain measurement accuracy in long-distance transmissions. Ashcroft temperature solutions are known for their accuracy, reliability and seamless integration into processes. That's why customers often ask us for guidance on how to ensure accurate readings, reduce installation errors and avoid costly downtime due to inaccurate readings. Read this article to learn how thermocouples and RTD extension wires work, why they matter and how to select the correct extension cables for your specific application. You will also learn when transmitters may be a good investment for long-distance signal integrity.

This article was originally published on September 6, 2022, and updated on July 7, 2025. When working with critical processes in power generation, chemical manufacturing or food processing, one of your primary challenges is ensuring accurate temperature measurement. The wrong sensor could lead to reduced performance, safety concerns or even equipment failure. That’s why selecting the correct temperature sensor for your application is so important. As a recognized leader in pressure and temperature measurement instruments, Ashcroft has been helping industries worldwide make informed decisions for over a century. In this article, you will learn about two types of temperature sensors, how they work and their respective advantages and disadvantages. You will also receive guidance on selecting the most suitable sensor for your specific needs.

Finding the right temperature sensor at a price that fits your budget can be a challenge. During an industrial project for a critical application that required both RTDs and thermocouples (two common types of temperature sensors), the buyer's main concern was cost. He had assumed these instruments were priced similarly. The reality is not all applications are the same and not all temperature sensors are created equal. A sensor designed to measure air temperature in a room is vastly different from one built to withstand 1,400 °C in a heat-treating furnace. The type of sensor, the environment it's used in and the level of accuracy or durability required can all influence the price. As a trusted leader in temperature and pressure measurement, we created this article to help you understand what really goes into the cost of a temperature sensor. Read this article to learn the top five cost drivers for temperature sensors so you can make a confident, cost-effective decision. By identifying what matters most to your application, you can avoid overpaying for unnecessary features—and feel confident that you’re selecting the right tool for the job. When you are done reading you will have a better idea of how much you can expect to pay for these instruments. Plus, you will see additional resources that can address other questions you may have about temperature sensors.

This article was originally published on April 4, 2022, and updated on June 4, 2025. When installing temperature instruments like bimetal thermometers, RTDs, or thermocouples, a small oversight—such as an improperly fitted thermowell—can lead to costly damage, safety risks or inaccurate readings. Thermowells are essential to protecting your thermometer or temperature sensor and ensuring accurate measurements in high-pressure and high-temperature applications, no matter how extreme the conditions. However, if they are too long or two short for the instrument they need to protect, you will not get an accurate temperature measurement and your instrument can be damaged. At Ashcroft, a leading authority in pressure and temperature instrumentation since 1852, we are often asked how to properly fit thermowells into various temperature instruments. Because there are so many factors to consider, such as making sure you have the correct measurements, knowing if a u-dimension is needed, remembering to subtract the tip thickness from the overall thermowell length and more, it can be easy to get the wrong size if you aren’t paying attention. Read this article to learn about thermowells and the different ways to measure your thermometer or RTD/thermocouple for proper installation. When you are done reading, you will understand what each measurement represents and be more proficient in fitting your temperature instrument with a thermowell. You will also see links to additional articles and resources that are available should you need to broaden your understanding of these instruments further.

If you are just starting a career in oil and gas, chemical processing or any industry that involves flammable materials, dust and other potentially ignitable substances, you need to understand the dangers associated with hazardous locations. This includes knowing what to look for when purchasing instruments for challenging and potentially explosive applications. As a product technical leader at Ashcroft - a recognized authority in pressure and temperature measurement instrumentation - I understand these challenges well. In this article, you will find valuable insights to help you navigate the complexities of monitoring temperature in hazardous location applications. This includes a definition of a hazardous location, the agency standards and approvals required for equipment used in these areas and why temperature instruments, in particular, to be fully certified to ensure the safety and compliance of your operation. When you are done reading, you will have a foundation of information and be more confident about your instrument choices for these challenging applications. You will also have access to additional resources that will deepen your knowledge of RTDs and thermocouples.

A thermocouple is a type of electrical temperature sensor that is used to measure and monitor temperature changes in process applications. Similar to resistance temperature detectors (RTDs), these sensors are designed to ensure accurate temperature readings in applications where precise temperature control is essential for safety and efficiency. As part of Ashcroft's Understanding the Basics series, this article will provide you with a high-level review of these instruments, including their origin, how they work for different applications and more. You will also gain insights about when to use (or not to use) this type of sensor and be directed to additional resources that can help you deepen your knowledge on the topic of temperature sensors. This information comes from 40 years of industry experience with temperature and pressure measurement, design, engineering, and product management, which includes 17 years working with Ashcroft - a leader in temperature and pressure instrumentation.