The Honeywell 3015HTB is a high-temperature variable reluctance speed sensor engineered for use in applications exposed to temperatures up to 260°C (450°F). This passive sensor operates without an external voltage source, converting actuator speed directly into an output frequency. A permanent magnet generates a magnetic field, and the passage of a ferrous metal target induces a current in a coil, producing an AC voltage signal proportional to the speed. The 3015HTB is ideal for engine RPM measurement in vehicles, motor speed monitoring in industrial machinery, and flow measurement in turbine meters. Its self-powered operation, simple installation, and wide operating speed range make it a versatile solution for various industrial speed sensing needs.