SU575555A1 - Device for measuring concentration - Google Patents

Description

one

The invention relates to the field of physicochemical study of electrolyte solutions and can be used to measure the concentration of solutions in the chemical, food, medical industry, in

thermal power.

A device for measuring concentration, containing a conductometric transducer with two current and digital measuring electrodes, is connected in series with a variable resistor to the input of the measuring device ij.

The drawback of the device is the norpeuj-bridging and measuring, due to the influence on the value of the measured signal of the potential difference of the measuring electrodes, temperature,.

It is also known a device containing a permanent magnet between the poles of which in the case is a conductometric transducer with current and measuring electrodes, the measuring electrodes are connected to the amplifier of the measuring device.

However, such a device does not provide

high measurement accuracy due to the inclusion of destabilizing factors of changes in the physicochemical parameters of the analyzed solutions on the measurement signal.

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

This aim is achieved in that the device is introduced reversible motor, a reading mechanism, introduced between the magnet poles of the Hall transducer measuring electrodes kotorogosoedineny pospedovatelno with measurement electrodes conductometric transducer vyho measuring device is connected to a reversible motor, kinematically connected with a reading mechanism and the housing of the transducer.

The proposed device is represented in the drawing.

It consists of a permanent magnet 1, a support 2 of a non-conductor of a non-magnetic and non-magnetic material with under-bearings (tnik 3, a housing 4 of a conductometric transducer with input and output devices 5, current electrodes 6, 7 and

electrodes 8, 9, converting Hall 10 with current electrodes 11, 12 of electronic amplifier 15, reversing motor 16, gearbox 1 7 and reading mechanism 18. The device works as follows

Under the action of alternating voltage applied to current electrodes b, 7 conductometric transducers and electrodes 11, 12 of the Hall converter 10, the current in the circuit of the conductometric converter and the Hall transducer is determined by the resistance of the solution in the housing 4, and consequently the electrolyte ion concentration in solution and the parameters of the current electrodes of the converter.

With the passage of alternating current. Through the Hall transducer, which is located in a magnetic field, EMF occurs on its measuring electrodes 13, 14, proportional to the values of alternating current in the circuit and the magnetic induction of the magnetic field of a constant magnet 1. Under the action of this magnetic field, the alternating current through the solution in the housing 4 of the conductometric converter, due to the mobility of the ions of the solution in a magnetic field on the measuring electrodes 8, 9 of the conductometric converter

an emf is generated, proportional to the mobility of the electrolyte ions in the solution, magnetic field induction, and depending on the position of the measuring electrodes 8, 9 of the conductometric transducer relative to the equipotential line of the magnetic field of the permanent magnet 1, the difference of the emf of the measuring electrodes 8, 9 of the conductometric transducer and 13, 14 Hall converter 10 is fed to the input of an e-amplifier amplifier 15, which amplifies the difference signal and controls a reversing motor 16, kinematically connected to a reference meter. Mechanism 18 and body 4 of a conductometric converter through a gearbox 17. If there is a difference in electromotive force at the input of the electronic amplifier 15, the reversible motor 16 through the gearbox 17 changes the position of the housing 4 of the conductometric converter relative to the poles of the permanent magnet 1 until the difference signal at the input electronic amplifier 15 will not be zero. In this case, the position of the measuring electrodes 8, 9 of the conductometric transducer relative to the equipotential line of the magnetic field will be changed until the moment of equality of the EMF on the measuring electrodes 8, 9 and the EMF of the measuring transducers of the Hall 10.

At the moment of equality of the EMF of the measuring electrodes 8, 9 of the conductometric transducer and the EMF will measure; the electrolyte electrodes 13, 14 of the Hall transducer 1О with the corresponding position of the housing 4 of the conductive converter, and therefore the reading and reading mechanism 18, the NIN device displays are proportional only electrolyte solution concentrations. At the same time, the results of measuring the concentration value are not affected by changes in the temperature of the analyzed solution, the nature of the solvent and the dissolved electrolyte, because of the changes in these parameters will change the value of the ion mobility in the solution, according to the values of which the measured value is corrected in the preprogrammed device. conductive transformer circuit.

When the value of the co1t concentration of the analyzed solution changes, the solution’s resistance in the co-instrumentation of the transducer changes, which causes a change in the current in the circuit of the series-connected current electrodes 6, 7, 11, 12 and leads to a change in the EMF of the measuring electrodes 13, 14 of the Hall converter 10, and the absence changing the value of the ion mobility causes the EMF to remain unchanged on the measuring electrodes 8. 9 conductometric transducer, therefore the difference is the first signal at the input of the electronic amplifier 15, which, using a reversing motor 16, through a gearbox 17, changes the position of the housing 4 of the conductometric transducer and the positioning of the measuring electrodes 8, O relative to the equivalent magnetic field line until the EMF is equal to the electromotive electrodes 8, 9 and the electromotive force on the electrical electrodes 13, 14 Hall.

The device will allow BiiicoKyio to obtain the accuracy of the measurement of the concentration of the solution; s with a wide range of izger-genomes of the tactics of the analyzers.

Claims (2)

1. Lopatin B. A. Theoretical bases of electrochemical methods of analysis, LA., 5 1975, p. 133. 2. The author's certificate № 2vy388, cl. H 03 K 7/06. 1970. ) I .T ,,.