PT100 Platinum Resistance Thermometers: What Are They?

PT100 sensors are the most widely available platinum resistance thermometers on the market. This is primarily due to their impressive resistance capabilities of <100 ohms.

Image credit: Allectra Ltd.

Occasionally referred to as ‘Platinum Resistance Thermometers (PRTs)’ or ‘Resistance Temperature Detectors (RTDs),’ PT100 resistors are widely recognized as proven and trusted temperature measurement devices.

A PT100 resister is effectively an updated and modified model of RTD. These devices are able to match and even surpass the precision of traditional measurement methods while also offering a wider range of functional applications.

Advantages of Platinum

Platinum is an extremely diverse and adaptable metal. It is commonly deployed in temperature measurement applications because of its stability and its ability to remain unreactive to any resistance-producing current that it comes into contact with.

Platinum is virtually impervious to oxidation and corrosion, meaning that it will remain operational for long periods without requiring replacement.

Platinum is also a comparatively light composite that is suitable for shaping and shaving down to extremely small sizes, making it ideal for connecting to sensors and wires.

Key Benefits of PT100 Resistors

PT100 resistors are the most up-to-date, modernized resistance-based temperature monitoring tool. As such, these innovative devices are rapidly replacing equipment that was previously commonplace.

Components that are resistance-reliant offer improved versatility in a wide range of applicable tasks, particularly when utilized in applications working with lower overall temperatures.

Their enhanced accuracy and regular repeatability have seen the use of PT100 resistors overtake that of standard thermocouples, and while some RTDs are marginally more expensive to produce, this additional investment is repaid in terms of their superior usability and overall quality.

PT100 resistors are rapidly becoming the gold standard in the industrial thermometer market. One key reason for this is their ability to gauge temperatures using only current-based resistance, effectively removing the additional workload and challenges associated with setting up special cables.

Cold junction compensation can also be avoided, and effective monitoring of thermal activities is now possible in more situations than ever before.

In applications where the resistivity of the connecting cables is known, it is possible to employ a 2-wire connection. More precise measurements may benefit from the use of a 4-wire connection.

The measurement instrument will compensate the resistivity of the connection wires automatically.

Risks of PT100 Resistors

Because the components were created to deal with a more diverse selection of temperature taking tasks, the technology used in the assembly of resistance thermometers is more vulnerable to impact damage. Its flexibility of multi-functionality makes it fragile requiring more care to be taken in its operation.  

This information has been sourced, reviewed and adapted from materials provided by Allectra Limited.

For more information on this source, please visit Allectra Limited.

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