| 摘要 |
By a method for monitoring a supply meter part in the meter, a movable indicator is illuminated through a pane and the movement is detected continuously outside the pane by means of reflected light, and an alarm signal is created, preferably when the indicator has not been standing still for a first period of time within a second period of time. The illuminating means and/or light detector means are directional and adjustable. The meter is preferably a water meter and the indicator its star wheel. Equipment for this monitoring has light detector means outside the casing of the meter to detect reflected light, and analytical means to indicate movements of the indicator and to form an alarm signal. Preferably, the equipment has illuminating means to illuminate the indicator, preferably with infrared light. Said means are preferably built together into a scanning unit which is adapted to be fastened on the meter. The scanning unit is preferably adjustable without using tools, and the equipment has preferably a control light to show an output signal from the light detector means. |
