Resistance temperature detector(RTD)

The RTD stands for resistance temperature detector which is designed and manufactured by using the basic principle that the resistance value of platinum wire changes with the change of temperature. It is divided into 10 ohms (grading number Pt10) and 100 ohm (graduation number is Pt100), etc., the temperature measurement range is large, suitable for -200~850 ℃. The temperature sensing element of the 10 ohm platinum thermal resistance is made of thick platinum wire, and the temperature resistance is obvious. The platinum thermal resistance better than 100 ohm is mainly used in the temperature zone above 650 ℃: 100 ohm platinum thermal resistance is mainly used in the temperature zone below 650 ℃, although it can also be used in the temperature zone above 650 ℃, but in the temperature above 650 ℃ A-level errors are not allowed in the zone.

An RTD, also known as resistance temperature detector, is a type of temperature sensor. An RTD consists of a sensing element, wires to connect the sensing element to the measurement device, and support to position the sensing element in the temperature measurement process.
A PT100 sensor is the most common type of RTD. RTDs are categorized into industrial, as well as general purpose. Each type is available as a PT100, PT250, PT500, and PT1000. (“Pt” is the symbol for platinum, “100” for the resistance in ohms at 0 °C) is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere.