Temperature probes are essential components in countless industries, from manufacturing and food processing to healthcare and scientific research. They play a critical role in monitoring and controlling temperature with accuracy and reliability. With the advancement of technology, the variety of temperature sensors available today is broader than ever, each designed for specific environments, precision levels, and response times.
However, choosing the right type of temperature probe can be overwhelming, especially if you're not familiar with sensor calibrations or the differences between probe types.
We will discuss three main types of thermosensors in this article: thermocouples, RTDs and thermistors. By reading it, you will know how to identify each type and what it has to offer in terms of benefits.
Temperature probes offer accurate and reliable measurements across a wide range of industrial applications. Whether monitoring machinery, controlling manufacturing processes, or ensuring workplace safety, temperature probes provide essential data for operational efficiency and product quality. They can measure air, liquid, or surface temperatures, making them highly versatile.
Surface temperature probes, in particular, are widely used in industrial settings to monitor equipment temperature without intrusive installation. Probes such as thermocouples, thermistors, and PT100 sensors can be easily adapted to various environments.
With customizable options, such as temperature range, cable length, and connection type, temperature probes can be tailored to meet specific application needs. Their ease of use, whether through surface contact, immersion, or insertion, makes them an indispensable tool for temperature data logging and control systems.
An RTD is also known as a resistive temperature detector, are highly precise temperature probe. Moreover, these RTD temperature sensors come in Platinum and Nickel finishes and various resistance ranges, including PT100/PT1000 or NI100/Ni1000, with a tendency to wear out over time, necessitating frequent replacement.
Temperature probes using NTC thermistors (Negative Temperature Coefficient) are usually potted into customised housings depending on the client's requirements.
Temperature thermistors reflect changes in temperature quickly and with very high accuracy. Often lower in cost, but offer a smaller temperature range. It is usually best to use NTC temperature sensors for applications where temperatures range from -40°C to +125°C when using epoxy-encapsulated NTCs whereas glass-encapsulated NTCs can reach up to +250°C.
Thermocouples are the most commonly used thermal probe sensors due to their simplicity, and speed of response to changes in temperature. Thermocouple probes are less stable over time and will need replacing more often.
There are many types of thermocouple probes, all made from different materials which allow for various temperatures. The most common is a Type K thermocouple, which has a temperature range of -180 to 1300 degrees Celsius.
Temperature probes are devices designed to measure temperature by detecting changes in specific physical properties.
Here’s a breakdown of their basic structure:
The measurement process of a temperature probe begins with the sensing element detecting changes in temperature from its environment. This change affects a physical property, such as resistance or voltage, which is then converted into an electrical signal. The signal is transmitted to a readout device, like a digital display or controller, where it is processed and shown as an accurate temperature reading.
Temperature probes are known for their robust design. This means they are ideal for many general-purpose industrial, commercial and scientific applications where accurate temperature measurement and monitoring play a crucial role to ensure equipment functions properly and efficiently. They can also be used for measuring and testing during investigations and tests.
These temperature sensor probes are often used in the following areas:
Selecting the right temperature probe depends on several practical factors:
RS Hong Kong is a trusted supplier offering temperature probes from top brands like Testo, Chauvin Arnoux, Hanna Instruments, and more. You can place orders online for fast delivery or local branch collection, or by phone. We also offer blanket orders with spend control for convenient multiple purchases under a single order number, simply call to set this up.
RS Hong Kong offers flexible delivery options for temperature probes to suit your needs. Same-day delivery is available for orders placed before noon on weekdays. Next-day delivery applies to orders placed later in the day or on weekends. For more details related to delivery options and charges, please refer to our delivery information page.