| 摘要 |
A sensor for optical detection of the moving parts (13) of a consumption meter (11) for visual indication of consumption has visual aiming means (16) assisting the correct mounting of the sensor with respect to the movable parts (13) of the meter. For use in connection with an electricity meter (11), which has a circular disc (13) with a visible mark (14) on its periphery, the aiming means (16) are designed so as to have an extent in two dimensions and so as to define a plane which is caused to coincide with the rotating disc (13) of the electricity meter (11) at the mounting of the sensor on the meter. |
