SU1599744A1 - Salt gauge - Google Patents

Abstract

The invention relates to a technique for measuring the salinity of liquids and can be used in the certification of measuring instruments of lower accuracy. The aim of the invention is to improve the accuracy and simplification of the salinometer. For this purpose, in a conductometric transducer of an additional winding with a communication element, this allows simultaneous measurement of both the salinity of the test liquid and its temperature. 1 il.

Description

. The invention relates to the technique of measuring the salinity of liquids and can be used in metrology as an exemplary tool for testing and calibrating means of lower accuracy, working measuring instruments, as well as for certifying standard solutions.

The aim of the invention is to improve the accuracy and simplification of the salinometer.

The drawing shows a structural electrical circuit of the proposed salinometer.

The salt meter contains a generator 1, a switch 2, a conductometric converter 3, including i - the first core 4, the first winding 5, the second core 6, the second 7 and the third 8 windings, the third core 9 and the fourth winding 10 connection, resistor 13. amplifier 14, synchronous detector 15,

display unit 16, voltage and current converter 17.

The alternator 1 generates a control signal to the synchronous detector 15, to the switchable input of switch 2 and the input of the voltage and current converter 17, the informative signal produced by conductometric converter 3 is amplified by an amplifier 14 and fed to the input of the synchronous detector 15, from which output enters the display unit 16. To the input of the converter 17 from generator 1 is supplied. voltage to calibrate the salinometer. Switch 2 switches the signal from generator 1 either to the first, l for the third winding.

Solemer works as follows.

Before starting the measurement, the salinometer is calibrated.

(Ls

sd

with her

4 4

I stage. From generator 1 serves

: signal to the winding 5 through switch 2, to the detector 15 and to the winding 10 through the converter 17. The cavities in the communication elements 11 and 12 are filled with a sample liquid with a known temperature, which is fixed. By varying the voltage and current from the output of the converter 17, zero indications of the indicator 16 are set at the output of the detector 13, and the voltage U ;, current 1 at the output of the converter I l 16 is fixed.

Stage II. From generator 1, through switch 2, resistor 1.3 delivers a signal to winding 7, leaving the other connections unchanged. Change value

; Resistors set zero readings on detector 15. Detector conductometer is placed: thermostat 3 into thermostat, set various temperatures within the working range of measured temperatures and corresponding equilibration values are recorded from the output of converter 17 corresponding to the equilibration. .

In the measurement mode, the coupling element 12 is filled with the liquid under study,: the coupling element 11 is exemplary, both; the liquids have an ambient temperature. The signal from generator 1 is transferred by switch 2 to winding 5, while current 1 flows in coupling element 11, and current Ij flows in communication element 12.

The difference in the matrix fluxes generated by currents 1 and Ij creates a current at the output of the winding 8, which: is amplified in amplifier 14 and supplied to detector 15. Depending on whether current Ij is greater or less than 1, output voltage of detector 15 or positive or negative. By adjusting the compensation signal supplied from the voltage converter 17 and the current, it is possible to achieve the equality of the currents 1d and Xs,. those. get at the output of the detector 15 zero signal. The increment value of the compensation signal corresponding to the zero voltage at the output of the detector 15 is proportional to the salinity of the test liquid,

In the Measurement mode of the temperature of the test liquid, the switch is set to the position corresponding to 0

five

0

It is connected to the generator 1 to the input of the resistor 13, while in the core 6 there are magnetic fluxes generated by the current I flowing in the winding 7 and the current TZ flowing through the communication element 12 filled with the liquid under study, which are directed oppositely. The process of balancing in this case is similar to that discussed earlier. The resulting value of the compensating signal carries information about the temperature of the test liquid.

Claims (1)

Invention Formula A salt meter containing a generator, the output of which is connected in series with the reference input of a synchronous detector and a display unit, a conductometric transducer comprising the first core, the first winding, which is located on the first core 5, the second core, the second and third windings, which are located on the second core , the first communication element, within which there is a cavity, is in, an adjacent cavity for filling with the test or exemplary liquid, and which is located between the first and second cores, and : the outputs of the first and second windings and the input of the third winding are connected to a common bus, a resistor, the output of which is connected to the input of the second winding, an amplifier whose input is connected to the output of the third winding, a switch,. the voltage and the terminal are connected to the output of the generator, characterized in that, in order to improve accuracy and simplification, a third core and a fourth winding, which is located on the third core, are introduced, the second communication element, inside which there is a cavity, which is with a cavity for filling with an exemplary liquid, and which is located between the second and third cores, the input of the fourth winding is connected to the output of the voltage and current converter, and its output is to a common bus, the input of the switch is connected to the output of g Generator, the first output of the switch is connected to the input of the first winding j, the second output of the switch is connected to another output of the resistor, and the output of the amplifier is connected to the second input of the synchronous detector. WITH ; ( five 0 five Compiled by V. Ezhov, editor T. Parfenova Tehred L. Oliynyk Order 3138 Circulation 5t1 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, - 4/5, Raushsk nab. Corrector about. Cherni Subscription