| 摘要 |
A fluid level sensor has a tube (21) with fixing groove and air opening (212) at the top and float (22) and lower seat (23) with central through hole (231) at the bottom and circuit board (25) inside a fixing flange (24) with ultrasonic or infrared sensor float height in its lower end protruding from the hole. Independent claims are included for upper an lower limits in the tube with associated acoustic warnings.
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