Resistance Temperature Detector Construction

The resistance temperature detector or the rtd is a sensor whose resistance changes with temperature typically built of a platinum pt wire wrapped around a ceramic bobbin the rtd exhibits behavior which is more accurate and more linear over wide temperature ranges than that of a thermocouple. The relationship between an rtd s resistance and the surrounding temperature is highly predictable allowing for accurate and consistent temperature measurement.

Control Engineering Temperature Measurement With Rtds Thermocouples

As temperature decreases resistance decreases.

Resistance temperature detector construction. Resistance temperature detectors rtds are summarized below. A resistance thermometer or resistance temperature detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. He wound a helical coil of platinum on a crossed mica web and mounted the assembly inside a glass tube.

The metals having a positive temperature coefficient is used for the construction of rtds. The relative change in resistance temperature coefficient. The classical resistance temperature detector rtd construction using platinum was proposed by c h.

This wire is referred to as a temperature sensor if we want to measure temperature with high accuracy rtd is the only one solution in industries. Common rtd sensing elements constructed of platinum copper or nickel have a repeatable resistance versus temperature relationship r vs t and operating temperature range the r vs t relationship is defined as the amount of resistance change of the sensor per degree of temperature change. Resistance temperature relationship of metals.

The resistance temperature detector uses the change in electrical resistance of the sensing element to determine its temperature. This construction minimized strain on the wire while maximizing resistance. If we want to measure temperature with high accuracy rtd is the only one solution in industries.

A resistance thermometer or resistance temperature detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. This wire is referred to as a temperature sensor. It has good linear characteristics over a wide range of temperature.

Construction and working principle of resistance temperature detector video lecture of temperature measurement transducers chapter in subject electronic instrumentation and measurement for. An rtd resistance temperature detector is a temperature sensor that operates on the measurement principle that a material s electrical resistance changes with temperature. Rtds are constructed using a fine pure metallic spring like wire surrounded by an insulator and enclosed in a metal.

It has good linear characteristics over a wide range of temperature. This is the basic resistance temperature detector working principle. As temperature increases resistance increases.

The resistance of an rtd varies directly with temperature.

Resistance Thermometer Wikipedia