TTR31

The operating principle of Resistance Temperature Detectors (RTDs) is temperature measurement based on the characteristic that the resistance of metallic conductors changes with temperature. Core principle: when temperature varies, the amplitude of lattice vibration in metallic conductors such as platinum and copper changes, causing different degrees of hindrance to electron movement and a corresponding change in resistance value. Taking the Pt100 platinum RTD as an example, its nominal resistance is 100 Ω at 0 °C; resistance increases by approximately 0.385 Ω per 1 °C temperature rise, showing highly‑linear behaviour within a certain temperature range. In practical measurement, a constant‑current source or bridge circuit converts resistance variations into electrical signals. 3‑wire / 4‑wire connection eliminates lead‑wire errors, and resistance values are finally converted into temperature values according to international standard reference tables.

Standard Application

Modern process measurement technology demands features such as cost‑effectiveness, space‑saving design, reliable operation, easy installation and commissioning. This temperature switch fully meets these requirements for safe process temperature measurement and monitoring. It offers an optional 1‑ or 2‑channel switching output, or one switching output plus one standard analogue output. The built‑in diaphragm shock‑resistant sensor ensures maximum operational safety.