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Electronic control systems using microprocessors for construction machines have been increasing rapidly in response to needs for safety and convenience on the part of operators. Sensors and actuators will play an important role in the proliferation of these systems. Recently, there has been a growing number of applications in which it is necessary to determine the displacement of hydraulic sensors. As a result, many types of sensor systems were developed for this type of application. However, so far there have been no systems capable of working well in construction machines due to these sensors having to be used under extremely severe conditions. Severe impact and high temperature conditions generated by compressed hydraulic oil ended up delaying the development of these systems. In response to these needs, the authors have developed a hydraulic cylinder equipped with a magnetic stroke sensor for use in heavy duty operations.