SU1569551A1 - Apparatus for measuring total consumption of liquids and gases - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the volumetric flow rate of liquids or gases. The invention allows for improved measurement accuracy. The device contains a sensor 1, driver 2, triggers, counters, frequency divider 10. The device includes ROM 16. It contains the values of the code that allow you to adjust the frequency of the pulses of the generator 13 of the clock frequency. DURING THIS IS THE DURATION OF EACH PERIOD OF THE INPUT SIGNAL WHEN MEASURING THE FLOW. 1 IL.

Description

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The invention relates to a measurement technique and can be used to measure the volumetric flow rate of liquids or gases.

The purpose of the invention is to increase the measurement accuracy.

The drawing shows a block diagram of the proposed device.

The output of the flow sensor 1 is connected to the input of the imager 2, the output of which is connected to the D input of the trigger 3, the direct output of which is connected to the first input of the first element I 4 and to the D input of the second trigger 5, the reverse output of which is connected to the second input element I 4, the output of which is connected to the C-input of the trigger 6, input setting zero counter 7 and the input of the inverter 8, the output of which is connected to the first input element I-9, the output of which through the divider 10 frequency is connected to the counting input of the counter 1 1, the outputs of which are connected to the inputs of qi 12 indicator light.

The output of the generator 13 clock pulses connected to the first input element And 14, to the C input of the trigger 5 and the input of the inverter 15, the output of which is connected to the C input of the trigger 3 and the counting input of the counter 70 Reverse output of the trigger 6 is connected to the second input of the element 9 The outputs of the counter 7 are connected to the address inputs / ROM 16, the stroke of which is connected to the second input of the element I 1 4, the output of which is connected to the counting input of the counter 17, the output of the higher bit of which is connected to the information transfer permission input to the counter 17 and to s-in one trigger, D - the input of which is connected to the common bus, and the input inputs of the presetting of the counter 17 are connected to the outputs of the keypad 19. The latter consists of a set of switches or jumpers, the number of which is equal to the number of bits of the counter 17, using these switches Any pre-calculated binary number can be fed to the input of counter 17.

The device works as follows.

The pulses of sensor 1 are formed by shaper 2 and arrive at D-input of trigger 30 The pulse of generator 13, which is inverted by inverter 15, is the closest after each such pulse, sets positive trigger to 1 with positive edge. The next front of the pulse generator 13, which is positive at the input of the inverter 15, sets to 1 the trigger 5. At the output of the element 4, AND-NOT, 1 again appears. Thus, taking into account that the frequency of the generator 13 is much higher than the input frequency, each input This impulse causes the output of a short negative impulse element AND-NOT 4, the duration of which is equal to half the period of the generator signal 13. At the output of the inverter, short positive pulses appear at the output of the inverter, which arrive at the first input of the element 9. Each a negative impulse from the output of the element IS-NOT 4 sets the counter 7 of the duration of the input period to O, and during the absence of these pulses the generator 7 pulses through the inverter 15 to the input of counter 7. The code from the output of counter 7 to steps on the address inputs of ROM 16.

When an address arriving at the ROM input corresponds to the address at which 1 is recorded, a pulse from the generator 13 output goes to the counter 17 input. When this counter overflows, a one-shot 18 is started. The pulse of this one-shot, having a duration equal to about half the period of the generator signal, carries In the counter 17, the number from the dial-in field 19 and sets the trigger 6 to 1. At this moment, the O. element begins to flow to the second input of the element 9, until the next pulse after the installation of the 6-in-1 trigger at the output of the element NID 4, the back front of the cat This returns the trigger 6 to O and restores 1 at the second input of element AND 9. The specified pulse does not pass to the output of element AND 9, since during its presence at the first input of this element at its second input there is an O. Thus, the input decreases frequency depending on the information recorded. in ROM.

The pulses from the output of the element AND 9 through the frequency divider 10, the division factor of which is established, in accordance with the pulse-factor of the sensor at the maximum frequency of the flow measurement range, arrive at the total flow meter, the state of which is indicated by the indicator 1 2.

Thus, the device allows to take into account the duration of each input period when measuring the flow.

Claims (1)

Invention Formula A device for measuring the total flow rate of liquids and gases, comprising a flow sensor connected to a pulse shaper, a trigger, first, second and third counters, a clock generator, an indicator connected to the outputs of the third counter, characterized in that, in order to improve measurement accuracy, introduced in series are the second trigger, the first element And, the first inverter, the second element And, the frequency divider, serially connected ROM and the third element And the second inverter, sequentially connected-. The one-shot vibrator and the third trigger whose inverted input is connected to the second input of the second element I, and the clock input is connected to the inputs of the first inverter and the second counter, the second input of the third element I is connected to the output of the clock generator pulses, the clock input of the second trigger and through the second inverter with the clock input of the first trigger the second input of the second counter, the output of the imager is connected to the D-input the first trigger, the output of which is connected to the second input of the first element I and to the D input of the second trigger, the output of the third element I is connected to the counting input of the first counter, the output of which is connected via a one-shot to the pre-set input, the outputs of the second counter are connected to the address inputs of the ROM, the output of the frequency divider is connected to the input of the third counter.