Resistance Temperature Detector

Resistance temperature detector is also known as RTD. An RTD is a temperature measuring device that measures temperature when a resistance changes. It is a device made of platinum. RTD works on temperature and resistance relationship and RTD is a passive device. RTD consist of insulated copper wires and resistive elements. The temperature sensing element of an RTD is a resistive element. RTD is commanly known as resistance thermometer and is a commaly used thermometer to measure temperature. Benefits of RTD is high accuricy and high temperature range. The RTD sensing element is metal and when electrical resistance changes with temperature.

There are two types of RTDs one is a thin film element and the other is a wire wound element.

Thin Film RTD

A thin film RTD is made of platinum film. A platinum film is known as a thin layer of resistive material and is formed on a ceramic substrate. Platinum thin film RTD is also known as Pt-RTD. Platinum thin film RTD is high accuracy over wide temperature ranges.

Wire Wound RTD

Ultra thin wire is used for wire wound type RTD sensing element. Ultra thin wire is usually a small coil of platinum. A platinum wire coil is packed in a glass tube or ceramic. A wire wound RTD is basically an inner coil type and a more accurate type of RTD