How does a resistance temperature detector work?

How does a resistance temperature detector work?

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.

What is an RTD temperature sensor?

An RTD (Resistance Temperature Detector) is a sensor whose resistance changes as its temperature changes. The resistance increases as the temperature of the sensor increases. The resistance vs temperature relationship is well known and is repeatable over time. An RTD is a passive device.

How do you measure temperature resistance?

Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum, nickel, or copper.

How an RTD is used to measure temperature?

An RTD is a temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. In practice, an electrical current is transmitted through a piece of metal (the RTD element or resistor) located in proximity to the area where temperature is to be measured.

What is the difference between PT100 and RTD?

There is no difference a PT100 is a version of a RTD (resistance temperature detector). What is an RTD? A resistance temperature detector, also known as an RTD or resistance thermometer, is a type of temperature sensor. A PT100 sensor is the most common type of Resistance Thermometer (RTD).

What is the relation between temperature and resistance of a conductor?

Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With increasing temperature, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.

What is the advantage of using resistance thermometers?

Is temperature directly proportional to resistance?

The resistance increases as the temperature of a metallic conductor increase, so the resistance is directly proportional to the temperature.

How does a Resistance Temperature Detector ( RTD ) work?

A Resistance Temperature Detector (RTD) functions on the resistance and temperature relationship in metals. It works on the principle of measurement which states that “The resistance of a material changes with temperature”.

How does the resistance of a resistance detector work?

The resistance of Resistance Temperature Detector (RTD) changes constantly with respect to the applied temperature and so the temperature is quite predictable by measurement of its resistance. It is this property which allows Resistance Temperature Detector (RTD) to measure temperature more accurately and consistently.

Which is the Best Metal for resistance temperature detector?

The most common metal which is used as Resistance Temperature Detector element is Platinum. Platinum is a noble metal and has stable resistance-temperature relationship over a large temperature range. In addition to Platinum, Nickel, Copper and Balco is also used as RTD element.

What is the resistance of an RTD at 0°C?

The 0.12% and 0.06% are original resistance tolerances at 0°C of the element. Temperature Coefficient (Alpha) Temperature coefficient, or Alpha, is the term given to the average resistance/temperature relationship of an RTD over the temperature span of 0-100°C and is expressed as ohm/ohm/0°C.