Guarantee of quality on industrial products is based on confirm whether materials, parts assembly and processing satisfy regulated standards or not. In some assemble process, it is hard to confirm the regulations are satisfied after once a work for the process have completed. For example, to fix a part using some screws, order to fasten the screws is regulated as a standard procedure to warrant accuracy. However, if screws are fastened in wrong order, the part will be fixed, however, incorrect order cannot be detected once this work have completed. We have long term experiment in a fuel tank attaching process in an automobile assembly factory. In this experiment, reliability of a sensor device we used was not enough. Also, to apply our system to other processes, improvement of reliability of the sensor is required. So we designed and implemented new sensor hardware. In this paper, we describe our new developed terrestrial magnetism sensor.

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