| 摘要 |
The proposed liquid flow rate meter with warning about the volume of liquid in the controlled reservoir contains a capacitive level transducer, an oscillator, a pulse former, a frequency divider, a trigger, two switching units, switching-type elements, two pulse counters, a summing unit, a high-frequency pulse generator, a decoder, and a digital display. The level transducer contains two plates, which are arranged on both sides of the reservoir and connected to the input of the oscillator, and an adjusting capacitor, which is connected in parallel to the plates. The length of each plate is equal to the height of the reservoir. The output of the oscillator is connected to the input of the pulse former. The output of the pulse former is connected to the first inputs of the switching units via the switching-type element, the frequency divider, and the trigger. The second inputs of the switching units are connected to the output of the pulse generator. The output of the first switching unit is connected to the input of the first counter. The output of the first counter is connected to the noninverting input of the summing unit via the switching-type element. The output of the second switching unit is connected to the input of the second counter. The output of the second counter is connected to the inverting input of the summing unit. The output of the summing unit is connected to the input of the display via the decoder.
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