SU1151822A1 - Device for measuring cumulative consumption of liquids and gases - Google Patents

Abstract

DEVICE FOR MEASUREMENT OF TOTAL FLUID AND GASES CONTAINMENT, containing a sensor, an output connected to a driver, a reference frequency generator, a first counter and a register with its outputs, a second counter, an adder, a trigger, and an indicator that is different in order to increase accuracy. the third and fourth counters and a key are entered into it, and the output of the reference frequency generator is psadklyuched to the input of the first counter and the control input of the driver, the output of which is connected to the input R of the first counter, to the transfer input to the register and the information input of the key, the first output of which is connected to the input of the second counter, and the second to the inputs of the third and fourth counters, an indicator is connected to the outputs of the fourth counter, the overflow input of the third counter is connected to the input of the initial installation of the second counter (L k and to the trigger) , the reset code of the adder is connected to the input of the installation of the third counter and the input S of the flip-flop, the output of which is connected to the control input of the key, and the inputs of the adder are connected to the outputs of the register and the second counter.

Description

UD ts5 REM 1 The invention relates to instrument engineering, in particular, to a device for measuring consumption of liquids and dies. It is known a device for measuring the cy value of the magnitude of the flow rate of liquids and gases, containing a sensor, the output connected in total to the indicator through a discrete calculator. th expense 1J. The disadvantage of the device is low accuracy caused by the error of non-linearity of the sensor characteristic. Closest to the proposed technical entity is a device for measuring the total value of the flow of liquids and gases, which contains a sensor, an output connected to the former, a reference frequency generator, a first counter and a register with its outputs, a second counter, an adder, a trigger and an indicator. In this device, increased immunity ZJ. However, the accuracy of this device is low due to the error of nonlinearity of the flow sensor. The aim of the invention is to improve the accuracy of measuring the total value of the flow of liquids and gases. This goal is achieved by the fact that a device for measuring the total value of the flow of liquids and gases, containing a sensor, an output connected to the driver, a reference frequency generator, a first counter and a connected one. with its outputs, a register, a second counter, an adder, a trigger and an indicator, entered the third and fourth counters and a key, with the output of the generator, the reference frequency being connected to the input of the first counter and the control input of the driver, the output of which is connected to the input R of the first counter, the transfer entry in the register and the key information input the first output of which is connected to the input of the second counter, and the second to the inputs of the third and fourth counters; the output of the fourth counter is connected to an indicator; the overflow output of the third counter is connected e to the input of the initial installation of the second counter and to the input R of the trigger, the overflow output of the adder is connected to the input of the installation of the third counter of the tick and the input 6 of the trigger, the output of co22; They are connected to the control input of the key, and the inputs of the adder are connected to the outputs of the register and the second counter. The drawing shows a diagram of a device for measuring the total flow of liquids and gases. The output of sensor 1 is connected to the input of driver 2, the code of which is connected to the input R of counter 3, the transfer input of register 4 and the information input of key 5, to the control input of which the output of trigger 6 is connected, to the input R of which the output of counter 7 and input the initial installation of the counter 8, and to the input 5 of the overflow output of the adder 9 and the input of the initial installation of the counter 7. The output of the reference frequency generator 10 is connected to the control input of the driver 2 and to the input of the counter 3 whose outputs are connected to the inputs of the register 4 whose outputs connected to the inputs of the adder 9, the second inputs of which are connected to the outputs of the subtractive counter 8. One. the output of the key 5 is connected to the inputs of counters 7 and 11, and the other to the input of the subtractive counter 8, the outputs of the counter 11 are connected to the inputs of the indicator 12, the information inputs of the presetting of the counters 7 and 8 are connected to sources of zeros and ones, the combination of which forms the number Nt by the inputs of the subtractive counter 8 and N at the inputs of the counter 7.ji Counter 11 can be set to O manually (installation circuits are not shown). The shaper contains two triggers, the direct and inverse outputs of which through the AND element are connected to you. ode shaper. The information input of the imager, to which the output of the flow sensor is connected, is connected to the input D of the first trigger. To the input D of the second trigger is connected to the output of the first trigger. The clock input of the imager, to which the output of the reference frequency generator is connected, is connected to the clock input of the first trigger, directly, and the clock input of the second trigger through an inverter. Thus, the driver for each pulse of the sensor and its output gives one pulse with a duration equal to the duration of the generator pulse. 3 A device for measuring the total flow of liquids and gases works in a roijHM manner. Counter 11 before starting operation is set to O by the operator. The pulses of sensor 1 are generated. shaper 2. Each pulse from the output of shaper 2 sets to About counter 3. Pr.optrean | the leading edge of the pulse, the contents of counter 3 is transferred to register 4. Since for all the time from the previous installation of counter 4 to O and to the next, pulses of the reference oscillator 10 are received at a frequency „, the number 4 is transferred to the register 4 the input signal. The pulses from the output of the imaging unit 2 through the key 5 are fed to the inputs of counters 7 and 11. After the counter 7 overflows with a signal from the output of its most significant bit, trigger 6 switches, and the subtractive counter 8 is set to state N, and the pulses output the driver 2 cher key 5 begins to arrive only at the input of the subtracting counter 8, with each pulse decreasing the state of the counter 8 by 1. When during the overflow of the adder 9 the unit switches to O, the trigger 6 switches and the counter 7 is set to the state Mg, The pulses from the output of the imager 2 begin to flow again to the inputs of the summing counters 7 and 11. Thus, after arriving, there is no C, (C- Cyr of pulses from the output of the spinner 2 to the inputs of counters 7 and 11, where C is the capacity of the counter 7, Trigger 6 is switched, on the input d counter 8 Received t N.N.g + + NJJ-B pulses, where V - counter container 8, after which the trigger 6 is switched again. In other words, when the number of pulses arrives from the driver 2, causing the counter 7 to overflow and the transition from 1 to O of the adder 9, r.e. pulses, the counter 11 will receive only j pulses, which is equivalent to reducing the average frequency of the pulses received on C 11 compared with the pulse frequency of sensor 1. The number N (selected from the condition N, B-, whereMrd, 4, Np pr 22 maximum frequency of the sensor, i.e. DNP of maximum flow. Then Kg will be equal to, „„ - 8 ° C is. Ng Wp-NpMVH. 7 and 8, only N pulses are sent to counter 11. Therefore, the average frequency of the pulses is f pbtx. The result decreases as compared to the input frequency. flow rate -f 1C D j where K is the coefficient of conversion of flow to frequency, is the flow rate of liquid or gas per unit of time. For known sensors, the conversion coefficient is not a quantity, but it is a function of the distribution A, hUO nature of lizka to the function of inverse proportionality, which is typical for the majority of volume sensors but. The condition of magnitude with a change in the flow rate t determines the resolution of the nonlinearity of the known,; wow device. With these exposures 4k; ft; max. We quantify the effect of increasing the accuracy with the help of the Moro device in comparison with the local one, the calibration characteristic of which. in; "k; y 2) de k; c / (A;)

at

Finally, the gradient-fuvochnaya characteristic of an ideal device, characterized by the absence of error from nonlinearity

(3)

one; ,

where K const.

From expressions (1) - (3), we obtain the errors from the nonlinearity of the known device

(BUT)

.S. (4 o% | i- i-oo%

1 1 ti

i- yidoX

and the intended device

 -i- b --- H- ;,

1Vl Cz I

From (4) and (5) it is easy to determine that the trigger is exactly

H

(6)

i in ;:

Sn;

The proposed device is pre-configured for the specific sensor with which it will function. For this, the calibration characteristic of this sensor, which has the form of a table, is experimentally measured.

where a, a game

 mox

The adjustment is made by selecting the appropriate values of the parametres D and f of function (1), which can be determined, for example, .1 in the same way.

151822.

Accept in (3), and since at the end of the range in; |. .to8n „- 0.

Now we will demand that the condition be met in the beginning of the 5th range

8p, 0 (7)

Then, based on (1), (3) and (7), we can write

D

 Kh-A,

KiA,

(eight)

Since, for a given sensor, the values K |, A ,, Kj, and A are constant, condition (8) can be written as

 .., is the value of sto nna.

.From (9) follows

I- T -to-Vio,

l n

(ten)

 where is also constant

; f, -

great

From (10) it follows that to satisfy the condition (7) it is enough that

t.

°

so dp -simplify calculations can accept

(eleven)

D f b

Substituting (11) in. (1), we obtain the expression of the calibration characteristics of the proposed device, configured for a specific sensor

.A;

uiL-L--

bU.ft; and according to (5) we get

to;

1: ".D. (1

bU; A; K „.- L„ |.

5, in contrast to the known in the proposed device, a controlled frequency divider is turned on between the driver and the summing counter.

following the sensor pulses, the division ratio of which increases with decreasing flow rates of liquids or gases flowing through the sensor. This compensates for the increase in the number of revolutions of the sensor per volume unit (1 m) of liquids or gases passing through it.

Claims (2)

DEVICE FOR MEASURING TOTAL FLOWS OF LIQUIDS AND GASES containing a sensor connected to the shaper by an output, a reference frequency generator, a first counter and a register connected to its outputs, a second counter, adder, trigger and indicator, characterized in that, in order to increase accuracy, it the third and fourth counters and a key are introduced, and the output of the reference frequency generator is connected to the input of the first counter and the control input of the driver, the output of which is connected to the input A of the first counter, the transfer input to the register and key input, the first output of which is connected to the input of the second counter, and the second - to the inputs of the third and fourth counters, an indicator is connected to the outputs of the fourth counter, the overflow input of the third counter is connected to the input of the initial installation of the second counter and to the trigger input K, overflow output the adder is connected to the input of the installation of the third counter and the input S a trigger whose output is connected to the control input of the key, and the inputs of the adder are connected to the outputs of the register and the second counter. ZZ8ISI1 2.