SU693172A1 - Method of continuously measuring the quantity of substance in moving paper web - Google Patents

Description

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The scientific research institute of gas mixture during calibration and the error of gas mixture certification during the implementation of the operation of determining the sensitivity of a controlled indicator ....

The presence of these errors leads to the fact that the total error in determining the sensitivity of the tape has a considerable size, which limits the metrological capabilities of gas analyzers in which this tape is then used.

In addition, the known method is very laborious and requires highly skilled performers, which is associated with the complexity and laboriousness of high-precision certification of gas mixtures.

The aim of the invention is to increase the reliability of control and reduce its labor intensity.

The essence of the invention is that two equal volumes of the gas mixture are introduced successively in interaction with the indicator at two different rates and the sensitivity of the indicator is judged by the ratio of the signal obtained during the first and second interaction.

The output signal of the measuring circuit of the photocolorimetric gas analyzer, in which the controlled tape is installed, is determined by the formula:

and K C V C (V) (1)

Where; K - sensitivity of the measuring circuit; C - concentration at the entrance to

gas analyzer;

V is the volume of the gas being analyzed, blown through the indicator means;

l (y) is the degree of absorption of the component being detected by the indicator, depending on the gas flow rate

mixes.

First, the gas mixture is supplied to the surface of the sensitive element with a velocity Vj, while

and, K-C-V- оС (V) (2)

Then the gas mixture is supplied with the speed Va (this measurement can be carried out both in the new and in the same area of the indicator substance as the first one).

The output signal of the circuit is equal to

(3)

Uj K-C-V-ot (V),

B - o (vi)

from 2 (V2)

(four)

Since oC (V) is a monotonically decreasing function, it can be decomposed in a series in powers of V

 9 | fv2-v, ji

oCCvJ.oCCv).

(five)

 vv.Vs BValv Y + ...

in view of (4) we have:

CVa-v)

(V2-v,) 2

d

aU

-1-1 -i

(6)

av

  H

,

TO is, if the first derivative of ° C on V at a point is not zero, then the equality

(7)

); V,, Val That is, the resulting ratio is a function of the sensitivity of the indicator and at the same time does not depend on the sensitivity of the measuring circuit and the concentration of the gas mixture on which the tape control operation is performed. . .

Thus, this ratio can be used as a parameter, characterizing the sensitivity of the indicator.

In this case, for a particular type of tape, the value is normalized for certain V, and V For example,

V-j 10 l / h

Vi: V 5 l / h and 1.5-0.1.

In this case, the operation of monitoring the sensitivity of the indicator, for example a tape, will be as follows. A controlled tape is installed in the gas analyzer, at its entrance a gas mixture is fed, the concentration of which is known only approximately. A series of measurements is made during which a certain volume of gas is blown through the belt, for example 1 l at a rate of 5 liters per hour. The average value of the instrument readings is U,. A series of measurements is made at the same volume and concentration, but at a speed of 10 l / h, the average value of the readings is determined - U ratio. If the value obtained lies within 1, SiO, 1, then a judgment is made about the validity of the tape.

In the proposed method, operations associated with the calibration of the gas analyzer and with the certification of gas mixtures are not required, which increases the reliability of the control and reduces its labor intensity.

Claims (1)

Invention Formula The method of determining the sensitivity of an indicator, for example, a photocolorimetric gas analyzer, is based on installing a controlled indicator in the gas analyzer, feeding a gas mixture to its input and comparing the readings with the required values, differing by that.  693172b that, in order to increase the reliability of the results obtained during the first and second take-overs and to reduce its labor intensity and cooperation. two equal volumes of gas mixture in- Sources of information, d t consistently interact with each other in the examination Vii with an indicator with two different1. Instructions on the production of insorosts and on the sensitivity of the BIO dictation tape. 045.006. (the producer is judged by the ratio of signals / totype).