RTD Sensor

RTD (Resistance Temperature Detector) are sensors used to measure temperature by correlating the resistance of the RTD element with temperature. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it. RTD element is made from a pure material whose resistance at various temperatures has been documented. The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature.

Resistance elements include Platinum, Nickel, Copper, and other components. Platinum is the most popular and accurate type.

1. Platinum RTD

a) Current: 5mA, 2mA, 1mA

A grade: 2mA, 1mA

JIS standard: 2mA, 1mA, 0.5mA

b) Category

· Pt100 means when the temperature is 0°C, the resistance for the element is 100 Ω

· JPt100 is Japanese stadnard