Abstract: An inspection system for a group of tanks, comprises a generator at each tank in which the temperature and the level of the liquid contained in each tank are converted into series data digital signals and start mark signals; and the series data signals are synchronized with clock signals and are transmitted to a receiver. The receiver includes a selector and pulse discriminator for selecting and detecting the start mark signals from a selected generator out of the received series data signals in the receiver. Clock signals are synchronized with the clock signals of the generator side by using the start mark signals; the received and selected series data signals are converted into parallel data signals and the content of the converted parallel data signals is displayed by an indicator to indicate the temperature and level of the liquid in the selected tank.

Abstract: A liquid level measuring apparatus consisting of a mechanism to convert the change in the liquid level into a rotational movement, a scanning apparatus to successively scan the magnetic-field generating electric conductors provided on a disc by means of a magneto-sensitive head caused to rotate by said mechanism, an electronic circuit to produce measured figures of said electric conductors scanned by said scanning apparatus as pulse signals, and a digital indicator caused to be operated by means of said signals produced by said electronic circuit.