“RTD” is an abbreviation for “Resistance Temperature Detector” An RTD is a type of temperature sensor which can be utilised in the manufacture of Variohms’ temperature probe range.
They are available with different temperature / resistance values depending on the application requirement.
An RTD consists of a resistance element and insulated copper wires. The most common number of wires is 2; however some RTDs have 3 or 4 wires. The resistive element is the temperature sensing element of the RTD. It is usually platinum because as a material it is highly stable over time, it has a wide temperature range, it offers an almost linear relationship between temperature and resistance and it has a chemical inertness. Nickle or copper are also other popular choices of material for the resistive element.
An RTD works by using a basic principle; as the temperature of a metal increases, so does the resistance to the flow of electricity. An electrical current is passed through the sensor, the resistance element is used to measure the resistance of the current being passed through it. As the temperature of the resistance element increases the electrical resistance also increases. The electrical resistance is measured in Ohms. The resistance value can then be converted into temperature based on the characteristics of the element. Typical response time for an RTD is between 0.5 and 5 seconds making them suitable to applications where an immediate response is not required.
RTDs are used within different industries including; automotive, white goods, marine and industrial applications. Benefits of using RTDs over other temperature sensors are;
· Highly accurate
· Offer long term stability
· High repeatability
· Suitable for extreme environments
· Have a high temperature range (depending on resistance element material)
RTDs are part of our temperature product range, we have the following options
Platinum RTDs – three different temperature ranges available; cryo, medium and high
Nickel RTDs – for applications with temperature ranges from -60C to +200C
Glass Wire Round RTDs – these are well suited to applications in test and measurement
SMD RTDs – for automatic mounting in large volume applications
For more information on our RTD sensor or any of the components we can offer please contact us: 01327 351004 or email@example.com
For more information please contact: Variohm EuroSensors Ltd Email: firstname.lastname@example.org Tel:+44 (0) 1327 351004 Fax: +44 (0) 1327 353564
Article date: 03 / May / 2019
How Does an RTD Work?
Published by: Variohm EuroSensor
From 20th January 2017 Variohm Eurosensor Ltd is part of the discoverIE plc Group of companies
Variohm EuroSensor,Williams' Barn, Tiffield Road,Towcester, Northants NN12 6HP.
Tel: +44 (0) 1327 351004.
Fax: +44 (0) 1327 353564.