SU1328681A1 - Method of calibrating reservoirs - Google Patents

Abstract

The invention relates to instrumentation. The purpose of the invention is to improve the accuracy of graduation. With the passage of fluid through the flow meter 6, the pre-installed charge begins to be charged off the dose meter 15 until this dose is removed. The signal from dose meter 15 is supplied to relay 18, which operates and supplies power to relay 20, which turns off pneumatic system 2 from three-way valve 7, as a result of which fluid flow switches to the channel without measurement, i.e. is dumped into tank 11. Exemplary dipstick 8 is disconnected. Flow meter 6 has. the error due to the inertia, then on the meter 15 of the dose is established the difference between the set and the actual values of the past liquid. 1 il. I (L

Description

The invention relates to instrument making and can be used in machine building and other industries.

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

The drawing shows a diagram of an apparatus for carrying out the method.

The method of calibration of tanks consists in the sequential discrete filling of the latter with a liquid through a liquid counter, and filling each portion of the liquid to a certain level of the tank. Conduct a fixation of the volume of a given portion and determine the relationship between the volumes of portions of the liquid introduced into the reservoir and the change in the level. Before filling the tank, a sample meter is filled through a flow meter with a portion of the liquid, the error of the flow meter is determined at each flow rate of the tank filling. The determination of the volume of a portion of the fluid introduced into the reservoir is carried out by the expression

VP;

i 1

1 -, - with:

 f (H.),

where Va, j is a definable fixed

volume; V; - volume removed from the scales of flow

V is the volume of the model mernik; - synthetic absolute error of the flow meter at various expenses; Nc; - level proportional to

fixed volume of filled fluid.

A device that implements the method of calibration of tanks consists of a graduated tank 1, a pneumatic system 2 containing a cylinder with sparse air and a gearbox, a centrifugal pump 3, flow control droplets 4 with a viewing device 5, a flow meter 6, a three-way valve 7, an exemplary measuring device 8, a level gauge 9 with a float 10 and a tank 11 connected by a piping system 12. The device is controlled by an electrical circuit including a control, calculating and recording unit 13 and a power supply 14.

The control, calculation and recording unit 13 consists of a dose counter 15, a filling counter 16, and a counter

5 about 5

0

at

0

5 0 g

Level 17, dose shut-off relay 18, electrofusion valve 19, air system connection relay 20 to three-way valve 7, Start buttons 21, Stop buttons 22 and mini-computer 23. The outputs of power supply unit 14 are connected to the inputs of dose meter 15, filling counter 16, 17 level counter, minicomputer 23 and Start button 21.

The outputs of the filling meters 16 and 17 are connected respectively to the inputs of the mini-computer 23. The dose meters 15 and the filling 16 are connected to the flow meter 6. The level meter 17 is connected to the level sensor 9. The dose meter 15 output is connected to the relay 18 by a winding. The winding of the relay 20 is connected through normally closed contacts of the relay 18 with the buttons Stop 22 and Start 21.

Start button 21 is connected for self-blocking parallel by normally open contacts of relay 20.

The device works as follows.

In the preparation procedure, liquid from tank 11 is pumped by centrifugal pump 3 to flow control throttle 4 with viewing device 5, three-way valve 7 and discharged through pipeline 12 to tank 11 until a stable mode (without bubbles) is established, which is determined by viewing device 5.

To determine the error of the flow meter, the installation is switched on to the error determination mode. To do this, by pressing the Start button 21, the electric air valve 19 is given a signal, which connects the pneumatic system 2 to the three-way valve 7, which includes the activation of the error detection mode. Under the action of the centrifugal pump 3, the fluid through the pipeline 12 from the tank 11, through the throttle 4, three-way valve 7 and the flow meter 6 enters the reference measuring device 8. On the dose counter 15, the number 200 is set, corresponding to the nominal capacity of the reference measuring device 8.

With the passage of fluid through the flow meter 6, the number 200 begins to be charged off the dose meter 15 until this dose is removed. After the 15 dose is deduced from the meter 15, the signal from the dose meter 15 is applied to the relay 18, which is activated

and provides power to the relay 0, which turns off the pneumatic system 2 from the three-way valve 7, as a result of which the fluid flow switches to the channel without measurement, i.e. discharged into reservoir .11.

This completes the step of determining the error of the flow meter, And calculates the own error of the flow meter. The reference meter 8 is disconnected.

Since the flow meter 6 has an error due to inertia.

then on the counter 15 dose sets - -jg determination of the volume of fluid servings

with the difference between the set and actual values of the transmitted liquid. The deviation from the zero value appears on the scale of the standard mernik, caused both by the inaccuracy of the flow meter due to its inertia and the intrinsic inaccuracy of the flow meter. Operations to determine the error of the flow meter are carried out at least 3 times.

Claims (1)

Invention Formula The method of calibration of tanks, which consists in sequential discrete filling of the tank with liquid through a liquid meter, moreover Editor O. Yurkovetska Order 3475/44 Compiled by V.Ermakov Tehred L. Serdyukova Circulation 693 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 each portion of fluid is filled to a certain level of the reservoir, the volume of this portion is recorded, and the relationship between the volumes of fluid portions introduced into the reservoir and the change in level is determined, which, in order to improve the calibration accuracy, before filling the reservoir filling the reference mernik through the flow meter with a portion of the liquid, determining the error of the flow meter at the tank filling flow rate, and in the tank, produced by VP  f () H given by the expression j о where v is - 5 0 PI VM Lg-: - definable fixed volume; -volume. removed from flow meter j scales - the volume of the standard mernik j systematic absolute error of the flow meter at various expenses; level proportional to the fixed volume of the liquid liquid. Proofreader G.Re shernik Subscription