What are the models of platinum resistance temperature sensors?

Release Date:

2023-05-10

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1. Principle of Temperature Measurement Using a Platinum Resistance Thermometer

Temperature is measured based on the principle that the resistance of a conductor or semiconductor varies with temperature. Resistance thermometers are commonly used for temperature sensing in the medium- and low-temperature ranges. Their key features include high measurement accuracy and stable performance.

2. Structure of the Platinum Resistance Thermometer

A platinum resistance thermometer consists of a temperature-sensing element, an outer casing, and a terminal box.

The temperature-sensing element primarily consists of a resistance wire, a support frame (made of insulating materials such as mica or ceramic), and lead wires.

3. Classification of Platinum Resistance Thermometers

a. According to the skeleton, min: ceramic, mica, quartz, and glass. For standard platinum resistance thermometers, they are made of stainless steel and quartz.

b. By wiring configuration: two-wire, three-wire, and four-wire systems.

Two-wire systems exhibit lead‑wire errors, but manufacturers typically compensate for these during production; consequently, the measured resistance of a two‑wire RTD includes the resistance of the internal lead wires. A four‑wire configuration completely eliminates lead‑wire errors. Standard platinum resistance thermometers are implemented using a four‑wire configuration.

C. According to the assembly configuration, they can be classified into sleeve-type, armored-type, and special types (such as explosion-proof and waterproof).

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