| 摘要 |
A control system detects an electrical resistance change in a connector (234,236) coupling a remote mounted temperature sensor (230) to said control system (200). The control system determines the resistance of the sensor or the connector by selectively charging or discharging a capacitor (224) through a unidirectional circuit element (238) or the sensor (230). The control system is disclosed as controlling a water heater system, although such control systems may be used to control other systems using remote mounted sensors. A calibrating circuit is used to measure a transient response of an RC circuit, from which resistance can be derived. <IMAGE> |
