The XJZC-03A speed impact sub monitoring device provides real-time data output. This intelligent device is a key monitoring device for the safe operation of steam turbines, integrating two modules: speed monitoring and impact sub action recording. It continuously tracks the speed and records the maximum value through microcomputer technology. When the emergency governor impactor operates due to centrifugal force reaching a threshold, the equipment accurately senses and stores the "striking" speed, as well as the "retracting" speed when conditions change subsequently. Data query is completed through the panel settings key.