Low-error platinum RTD circuit has shutdown capability.(Technology Information)

RESISTOR-TEMPERATURE detectors (RTDs), are the most stable and popular temperature sensors. Platinum RTDs allow for a much wider range of temperatures than silicon-based sensors. In many cases, platinum RTDs sit far from the measurement circuitry, which adds a great deal of error into the measurement system. The circuit in Figure 1 eliminates error by using a general-purpose amplifier and Kelvin-connected voltage references. The circuit also allows for single-supply operation and can detect temperatures of -200 to +400 [degrees] C with an output-voltage-scaling factor (sensitivity