SU1543240A1 - Arrangement for correcting flowmeter indications - Google Patents

Abstract

The invention relates to a measurement technique and can be used to improve the measurement accuracy of liquid flow measurement devices. The purpose of the invention is to improve the measurement accuracy. The device contains two analog-digital converters (ADC), permanent memory (ROM), counter, register, logic elements. With the aid of an ADC, the signals of the primary transducers are converted into a code that is summed with the flow rate code. The resulting code is fed to the address inputs of the ROM, in the cells of which the true mass of the consumed fluid flowing through the controlled section is stored. 1 il.

Description

The invention relates to a measurement technique and can be used to improve the accuracy of liquid flow measurement devices operated under conditions of external destabilizing factors.

The aim of the invention is to improve the accuracy of the correction.

The drawing shows a block diagram of the proposed device.

The device for correcting the readings of the flow meters contains an input bus 1 of the flow information, a driver 2 pulses, an AND 3 element, a counter 4, a register 5, a persistent memory 6, an indication unit 7, a reset bus 8, a generator 9, an OR 10 element, D- trigger 11, delay element 12, first ADC 13, second ADC.

The flow information bus 1 is connected to the first driver input.

2 pulses, the second input of which is connected to the output of the generator 9 and the first input of the element I 3. The direct output of the driver 2 is connected to the counting input of the D-flip-flop 11. The inverse output of the driver 2 of the pulses is connected to the second input of the element 3, the third input connected to the direct output of the D-flip-flop 11 and the input of the delay element 12. The output element And 3 is connected to the counting input of the counter 4 pulses. The reset input of the counter 4 pulses is connected to the output of the element OR 10. The information outputs of the counter of 4 pulses are connected to the corresponding inputs of the register 5. The write enable input of the register 5 is connected to the output of the delay element 12 and the second input of the element OR 10. The information outputs of the register 5 are connected to the address inputs A0-AG ROM, whose address ,,,

with the corresponding outputs of the A / D converter 13, and the address inputs nvm., fAhtrT1 + K with the corresponding outputs of the A / D converter I. The information outputs of the ROM 6 are connected to the inputs of the display unit 7. D-exoq P-flip-flop 11 is connected to its inverse output. The pressure input bus 15 is connected to the information input of the A / D converter 1, the temperature input bus 16 with the information input of the A / D converter.

The device works as follows.

The input bus 1 information about the flow of the received pulses from the primary sensor. Shaper 2 forms rectangular pulses of duration t from the input pulse

-i

and t. - t

er Moments of time

t, correspond to the amplitude value given to the reference level. These pulses arrive at the D input of the D flip-flop 11, which operates in counting mode. A single signal at the output of the D-flip-flop allows the passage of reference pulses from the generator output 9 pulses through the element 3 to the counting T-input of the counter k. When the output signal of the D-flip-flop 11 from high to low is prevented, the estimated pulses through element 3 are prohibited. At the same time, this signal through delay element 12 is fed to the control input from register 5 and to the second input of element OR 10. By the difference of this signal, the code from the information outputs of the counter k is read into register 5. Thereafter, the signal from the output of the element OR 10 resets the counter to the initial zero state. Thus, counter 4 is being prepared for a new measurement cycle. The code at the output of the counter, and, consequently, the register 5 is correlated with the volume of fluid flowing over a period of time T through a section controlled by the flow meter. The corresponding code from the register 5 output goes to the address inputs of the ROM 6 and, together with the output codes of the ADC 13 and 1k, determines the cell address where the corrected mass of fluid consumed through the controlled section per unit of time is stored at the appropriate temperature and pressure.

The device allows you to adjust the flow rate values taking into account any calibration dependencies (including q

ten

15

20

25

thirty

35

40

45

50

55

le and non-linear) on temperature and pressure.

Claims (1)

Invention Formula A device for correcting flow meter readings, containing input flow, pressure, temperature and relief tires, driver, D-flip-flop, counter, I element, reference pulse generator and display unit, with a reset bus connected to the D-trigger set-up input flow bus - with the first input of the pulse former, the second input of which is connected to the first input of the element I and to the output of the reference pulse generator, the direct output of the pulse former is connected to the counting input of the D-flip-flop, the direct output of which Connected with the third input of the element And, the inverse output of the D-flip-flop is connected to its D-input, the counting input of the counter - with the output of the element And, the second input of which is connected to the inverse output of the pulse former, with the aim of improving the accuracy of the correction , the first and second analog-to-digital converters, the persistent storage device, the OR element, the delay element, the register are added to it, the reset bus is connected to the first input of the OR element and the register setup input, the information inputs of the The first is connected to the information outputs of the counter, and the outputs are connected to the first group of address inputs of the permanent storage device, the second and third groups of the address inputs of which are connected respectively to the information outputs of the first and second analog-digital converters, the control input of the permanent storage device is connected to zero bus, and its information outputs - with the inputs of the display unit, the input of the delay element is connected to the direct output of the D-flip-flop and the third input of the element And, the output of the delay element ki — with the register entry input and with the second input of the OR element, the output of which is connected to the installation input of the meter; the input pressure and temperature buses are connected respectively to the inputs of the first and second analog-to-digital converters.