brands

attributes.Product_Type

attributes.Sensor_Type

attributes.Probe_Type

attributes.Probe_Tip_Type

attributes.Probe_Length

attributes.Probe_Diameter

attributes.Maximum_Temperature_Measurement

attributes.Cable_Length

attributes.Minimum_Temperature_Measurement

attributes.Accuracy

attributes.Best_Accuracy

attributes.Connector_Type

attributes.Calibrated_service_type

attributes.Model_Number

attributes.StandardsApprovals

attributes.For_Use_With

Pico Technology PT100 Immersion Temperature Probe, 150mm Length, 4mm Diameter, +250 °C Max

Digitron P0234 General Temperature Probe, Type PT100, max. +600 °C

Testo 0609 1273 PT100 Immersion, Penetration Temperature Probe

Pico Technology PT100 Air Temperature Probe, 120mm Length, 3.3mm Diameter, +250 °C Max

Pico Technology PT100 General Temperature Probe, 120mm Length, 3mm Diameter, +260 °C Max

Testo PT100 Needle PT100 Temperature Probe, 200mm Length, 3mm Diameter, 400 °C Max

Testo PT100 Needle PT100 Temperature Probe, 200mm Length, 6mm Diameter, 400 °C Max


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.

## **Benefits of Temperature Probes**

Temperature probes offer accurate and reliable measurements across a wide range of industrial applications. Whether monitoring machinery, controlling manufacturing processes, or ensuring [workplace safety](https://hken.rs-online.com/web/content/discovery/ideas-and-advice/workplace-on-site-safety-guide), 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.

## **Types of Temperature Probes**

### **Resistive Temperature Detectors (RTD temperature sensor)**

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.

### **Negative Temperature Coefficient (NTC temperature sensor) thermistor**

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.

### **Thermocouple probes**

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.

## **How Temperature Probes Work?**

Temperature probes are devices designed to measure temperature by detecting changes in specific physical properties. 

Here’s a breakdown of their basic structure:

- **Sensing Element:** The core component that reacts to temperature changes. Common types include:
    1. **Resistance Temperature Detectors (RTDs):** Use materials like platinum whose resistance increases with temperature.
    2. **Thermocouples:** Consist of two different metals joined at one end; they generate a voltage when heated, known as the Seebeck effect.
    3. **Thermistors:** Semiconductors that change resistance with temperature, typically used in specific temperature ranges.
- **Protective Sheath:** Encases the sensing element to shield it from environmental factors.
- **Connection Wires:** Transmit the signal from the sensing element to the readout device.

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.

## **Top Applications for Temperature Probes**

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:

- **Air Conditioning and Refrigeration:** Used to monitor system efficiency and maintain optimal cooling performance.
- **Chemical Industry:** Ensures precise temperature control for safe reactions and process stability.
- **Plastics Processing:** Monitors mold and extrusion temperatures for quality assurance.
- **Stoves and Grills:** Used in industrial kitchens to maintain consistent heat levels.
- **Food Processing:** Critical for safety and quality during cooking, storage, and transport.
- **Laboratories:** Supports experiments requiring controlled temperature conditions.

## **How to Choose the Right Temperature Probe?**

Selecting the right temperature probe depends on several practical factors:

- **Application Type:** Choose based on use; food safety requires fast, accurate probes; industrial applications need durability; research demands high precision.
- **Temperature Range:** Match the probe to your required range. Thermocouples handle extreme temperatures (up to 2000°C), while RTDs and thermistors are ideal for 200°C to 600°C.
- **Accuracy:** RTDs are best for high-accuracy needs like lab work; thermistors are more cost-effective but less precise, often used in consumer devices.
- **Response Time:** Fast-reacting probes like thermocouples are ideal for applications needing quick adjustments. Slower probes may not suit dynamic environments.
- **Environmental Conditions:** Consider exposure to moisture, chemicals, or vibration. Select probes with appropriate protective materials for harsh settings.
- **Size and Form Factor:** Ensure the temperature probe fits your space and setup, miniature or surface, mount types work well in tight spots.
- **Cost:** Balance features and budget. High-end models offer advanced performance, but simpler probes may meet basic needs affordably.

## **How to Order Temperature Probes from RS Hong Kong?**

RS Hong Kong is a trusted supplier offering temperature probes from top brands like [Testo](https://hken.rs-online.com/web/b/testo/), [Chauvin Arnoux](https://hken.rs-online.com/web/b/chauvin-arnoux/), [Hanna Instruments](https://hken.rs-online.com/web/b/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.

## **How Delivery of Temperature Probes Works at RS Hong Kong?**

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](https://hken.rs-online.com/web/content/support/all-articles/delivery) page.



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