TECHNOLOGY

How does a resistance temperature detector work, and what are its various types?

Sneha Shuklaby Sneha Shukla

In most applications, temperature is a parameter that requires constant attention. This is due to the fact that an application’s functionality is temperature-dependent. Monitoring is, therefore, crucial to guaranteeing that the ideal temperature is always maintained. For this particular function, you employ temperature sensors, such as thermocouples and resistance temperature detector sensors. Resistance temperature detectors are devices that monitor the temperature. Compared to a thermocouple, RTD often has higher reproducibility, better precision, accuracy, and repeatability. To buy the RTDs choose the resistance temperature detector supplier who offers in high quality. Many industries employ resistance temperature detectors as temperature sensors. Here you can see how a resistance temperature detector work and its various types:

Contents hide
1 What is an RTD Sensor?
2 How does RTD work?
2.1 RTD working principle
3 RTD sensors types
3.1 Thin-film RTDs
3.2 Wire-wound RTDs
4 Resistance temperature detector benefits

What is an RTD Sensor?

The term RTD stands for Resistance Temperature Detector. RTDs use resistance to measure temperature, and as the temperature rises, the resistance value also increases. RTDs are often produced using copper, nickel, or platinum. The base resistance value and the temperature coefficient of resistance value are specified for RTDs.

According to the material, the base resistance value typically ranges from 10 to many thousands of Ohms, with 100 ohms being the most common. It represents the nominal resistance of the RTD at 0°C for nickel and platinum constructions or 25°C for copper constructions.

The coefficient of resistance is essential for measuring equipment to calculate temperature changes accurately. When the resistance value rises, the TCR calculates higher temperatures. There is a link between the resistance value and the temperature value. To buy the RTD, choose the resistance temperature detector supplier who offers it at an affordable price.

How does RTD work? 

A resistance element and shielded Platinum wires make up an RTD. It might occasionally include three or four wires to maximise accuracy and prevent connection lead resistance issues. Platinum is used as the resistance element because it is extremely long-term stable, linearly relates to temperature and resistance, has a wide temperature range, and is chemically inert. If you want to buy the RTD, choose the resistance temperature detector supplier who offers all types of RTD sensors.

 RTD working principle 

The RTD operates according to a fundamental principle. The resistance to the flow of electricity also rises as a metal’s temperature increases. To measure the resistance of the current flowing through the sensor, an electrical current is passed through the resistance element. Along with an increase in electrical resistance, the resistance element’s temperature rises. In Ohms, the electrical resistance is expressed. The resistance value subsequently be translated into temperature based on the element’s properties. In between 0.5 and 5 seconds, an RTD normally reacts. They are, therefore, perfectly suited for numerous applications.

RTD sensors types 

Resistance temperature detectors come in two varieties. The construction of the temperature-sensing gadget affects how they are designed. Wire-wound elements are found in the first group, while thin-film components are found in the second.

Thin-film RTDs 

A thin layer of metal on a ceramic substrate is typically deposited to create the thin-film RTD components. To reach the appropriate resistance level, a laser is used to cut or etch an electrical circuit pattern into the metal layer. Before attaching lead wires, the entire element is protected with a thin coating of glass. Thin-film RTDs have the benefits of being dependable and cost-effective to manufacture.

 Wire-wound RTDs

The alternative RTD type is wire-would. Its sensing component is a tiny coil of extremely thin platinum wire. The wire coil may be housed inside a ceramic or glass tube, but it may alternatively be wrapped around the exterior of the housing material.

Benefits of wire-wound RTDs include their high accuracy and ease of submersion in a variety of liquids for those with glass cores. In contrast, those with ceramic cores can be used to detect extremely high temperatures accurately. To buy the wire-wound RTDs, choose a resistance temperature detector supplier who offers durable one.

 Resistance temperature detector benefits

Choosing these sensors has a lot of advantages. These sensors, for instance, can withstand temperature changes effectively. This product may be the best choice if you need to measure a wide range of temperatures in the area where the sensor will be used.

They can endure temperatures as high as 850 degrees Celsius and as low as -200 degrees Celsius due to their wire-wound construction. In contrast, products manufactured with a thin sheet can withstand temperatures only from -50 to 500 degrees Celsius.

This type of temperature sensor is exchangeable so that it may be replaced as necessary. The product is also fairly stable in a challenging environment. Because of its stability, the product will last very long.

Winding up

Thus, those mentioned above are about how a resistance temperature detector works and its various types. RTD has a consistent output, making it the ideal tool to use in the industrial setting to monitor temperature accurately.

Sneha Shukla

View all posts by Sneha Shukla →

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