SU1315818A1 - Method of calibration checking of liquid and gas meters - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to simplify and reduce the time for checking two or more consecutively included meters in determining the multiplicative part of the systematic component of the error. The flow value in the flow line 1 is fixed by counters 2 of the amount of liquid or gas. Then, while keeping the flow rate on the flow line 1, the flow is pushed apart, one part of it is fed into the main flow line 3, and the remaining part is fed to part 4 of the flow selection section 5 to accurately measure the amount of liquid or gas and fix along the line 1 flow using the device 6. 1 Il. le (L came up with 00

Description

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The invention relates to a measurement technique and can be used in the calibration of instruments for measuring the amount of liquid or gas.

The aim of the invention is to simplify and reduce the calibration time of two or more consecutively included meters in determining the multiplicative part of the systematic component error.

The drawing shows a schematic diagram of the implementation of the calibration of the counters for the amount of liquid and gas.

The circuit includes a flow supply line 1, adjustable counters 2, a main flow line 3, a partial flow selection line 4, a unit 5 for accurately measuring the amount of liquid or gas, such as an exemplary device, and flow quantity control devices 6, such as taps.

The method is carried out as follows.

The magnitude of the flow entering the flow line 1 at the flow rate being investigated (Q) is recorded first in the course of the flow movement by a measurable counter.

2 quantities of liquid or gas installed on line 1 of the flow,

and other calibrated counters 2 installed on the main line

3 threads. Then, while maintaining on flow supply line 1, flow rate Q. One part of the flow is fed to the main line 3 of the flow, and the rest is served

in line 4 of the withdrawal of a part of the flow to unit 5 of an accurate measurement of the quantity. liquid or gas 5 and record the quantities of the amount of liquid or gas passing through line 1 and the main line 3 checked by counters 2, and along line 4 of the extraction of a part of the flow - by block 5 of accurate measurement of the amount of liquid or gas. The flow in line 1 and line 4 is regulated by means of devices 6.

one

With the flow rate on line 1

flow rate Q meter readings 2 of the amount of liquid or gas in the case of the absence of partial flow on line 4 (first dimension) A, where 1 is the index of the meter being turned 2 quantities (i 1, .., 5 D К is the number of instruments being turned ) ..

With the same "flow rate" on the flow supply line 1 Q, readings of countable meters 2 with a value of 182

the boron of the flow through line 4 in an amount equal to l (second dimension),

BUT.,--

The readings of the counters 2 installed in line 3 are respectively equal to В ,; and B ,,,.

Then, in accordance with the installation scheme of calibrated meters 2 (Fig. 1), taking into account the fact that the error of the unit 5 for accurately measuring the amount of liquid or gas is negligible in comparison with the indications of calibrated meters 2, and also taking into account that i value

is small compared with indications A and B, | ,, the relative error of the calibrated counters 2 does not change in both measurements, i.e.

Mr. - with. - 1 J

where - the error of the i-ro verifiable counter 2 in the first dimension,

 - the error of the i-ro calibrated counter in the second dimension.

Absolute Measurement error in the General Case is made up of random l

and systematic A,

error components, and the systematic error component may contain an additive part — independent of the value of the measured quantity U odd and the multiplicative

part - changing in proportion to the measured value of the case of reducing the random component of the error to a minimum by known methods and a priori known fact

without the additive part of the systematic error component, it is possible to record the absolute error. measurement as the product of the relative error of 6 and the true value of the countable counter of the quantity X j.

Taking into account the invariance of the relative error of the calibrated instruments in both dimensions, an algebraic system of three linear equations with three unknowns is obtained.

BUT,; + e, x, b ,; - + x, .e ,,;

 i-, xB, 2j + xs. + U;

55

X x + u

Excluding the true values of the quantities of 1-shea gas liquid in the first of 31158184

measurements of x, and in the second: in line 1 - and their verification by comparing these indices and lines 3 - x, j, definable relative parts of the flow, differing structure errors, can be obtained from the equations of washings in the presence and absence of selection at the same time, in order to simplify and shorten.5 the calibration time of two or more

series-connected meters

Claims (1)

The claims of the invention take part of the stream after passing the stream of the first one. go-go The method of calibration of liquid meters or a flow of a turnable counter into a co-and gas, including a flow of a quantity not exceeding the value of a cut across the sequentially checked test error of the flowable meters, the selection of a part of the flow, the counters, and the checking is carried out, measuring it with an exemplary tool, compared balance equations to the number of measured readable flow counters.