| 摘要 |
An automatic damper control comprising: damper means for use in a flue or the like; diaphragm means adapted to expand and contract in response to pressure variations in the flue; and sensor means for sensing the pressure in the flue. The sensor means is connected to the diaphragm means and comprises means for generating a plurality of beams of light. The sensor means further comprises collimating means adapted to collimate each of the beams of light onto a photoreceptor. The damper control also comprises blocking means for blocking at least one of the beams of light. The blocking means is operatively associated with the diaphragm means and is adapted to be displaced relative to the beams of light in response to movement by the diaphragm means. Drive means are additionally provided for moving the damper means in response to pressure variations in the flue.
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