Shop System Sensor Wired Heat Detectors at GeoArm Security. Browse hardwired fixed-temperature, rate-of-rise, restorable, non-restorable, single-circuit, and dual-circuit thermal detectors designed to identify unusually high or rapidly increasing temperatures. System Sensor-compatible wired heat detectors support GeoArm 24/7 professional UL-listed central station fire alarm monitoring with no long-term contract.