SU890245A2 - Device for high frequency titration - Google Patents

Description

one

The invention relates to a measuring technique and can be used in the titrometric analysis of the composition of substances.

According to the main auth. No. a device for high-frequency titration is known, including a high-frequency generator, a comparative oscillating circuit, a working circuit, a metering unit, a titration cell, a servo motor, a switching unit consisting of a relay and a contact group, and an automatic optimizer, the control outputs of which are connected to the switching unit, moreover, one of its outputs is connected to the relay, and the second output is connected through one contact of the contact group and the servomotor is connected to the working circuit, and through the second contact of the contact group is connected to the dose ru Ci.

The disadvantage of the known device is low, the noise immunity in the process of determining the equivalence point and the need to use special averaging devices to read the concentration readings and select the end of the search process.

The purpose of the invention is to improve the noise immunity and accuracy of titration.

This goal is achieved in that the device additionally contains reversible counters, the main input of the first counter being connected to the output: positive increment signals of the automatic optimizer, the reset input of the first counter associated with the output of the negative optimizer signals of the automatic optimizer, and the output of the first counter connected to the setup input to the initial state of the second counter, the main input of which is connected with the output of the negative increment signals of the automatic optimizer, and the output is connected. to the automatic optimizer.

The drawing shows a block diagram of a device for high-frequency titration.

The device consists of a high-frequency generator 1, an oscillating circuit 2, an automatic optimizer 3 with control outputs k and 5 and outputs positive 6 and negative 7 increments, a switching device with a relay 8 and a contact group 9 of a servomotor 10, a working circuit 11, a dispenser 12, and a rotating cell 13, reversible rotors 14 and 15 with inputs 16 and 17 to the initial state.

The device works as follows.

Cell 13 contains the test substance. The signal from generator 1 sinks to the comparative oscillating circuit 2 and when resonant electric oscillations occur in it goes further to the automatic optimizer 3. The optimizer 3 adjusts the working circuit 11 via resonance using a servomotor 10 connected via a normally closed contact of the contact group 9 to the control output k of the optimizer 3. At the initial moment of time, in the reversible counter 14, the number m is written, which determines the recovery area of the initial state of the reversible counter 15 in the event of Random interference. In the counter 15, in the initial state, the number n is recorded, determining the required number of self-oscillation cycles before the appearance of a signal for switching to another type of work or stopping the process.

During operation, the input of the reversible counter 14 receives discrete signals of positive increments from the output 6 of the optimizer 3, each of which reduces its state by one, and the signal corresponding to the zero state of the counter 14 sets the counter 15 through the input 17 to the initial state.

In the course of operation, the input of the counter 15 receives discrete signals of negative increments (reverse signals) from output 7 of the optimizer 3, each of which reduces its state by one and at the same time sets the counter 14 to its initial state through input 1b. The signal corresponding to the zero state of the counter 15 is fed to the input of the optimizer 3, which through control output 5 switches the relay 8 thereby connecting the metering device 12 through the normally open contact of the contact group 9 to the control run 1 | 4. This means that high-frequency titration is transferred from tuning mode to operating mode-and the automatic titration process begins. The end of the high-frequency titration process serves to establish self-oscillations in the vicinity of the equivalence point, which are interrupted by the output signal of counter 15 through n cycles of self-oscillations.

In the case of the occurrence in the process of accidental interference, leading to

Usually, to the false reverse of the automatic optimizer, the reverse is taken into account by the counter 15. However, if the interference happens less often than once in m taKts, then the counter 14 after m intervals of discreteness restores the initial state of the counter 15. If the reverse signals arrive more often than once m cycles, this indicates the establishment of self-oscillations. The counter 14 at each reverse is reset and does not affect the operation of the counter 15, which, counting out a given number of auto-oscillations n, generates a signal on the establishment of self-oscillations, which increases the noise immunity and accuracy of determining the extreme point in the process of establishing self-oscillations.

Claims (1)

Invention Formula Device for high-frequency titration according to auth.St. W 581429, differing in that, in order to increase noise immunity and titration accuracy, it additionally contains reversible counters, the main input of the first counter connected to the output of the positive optimizer signals of the automatic optimizer, the setting input to the initial state of the first counter is associated with the output of signals negative increments of the automatic optimizer, and the output of the first counter is connected to the setup input of the second counter, the main input of which is connected to the output signal s negative increments of the automatic optimizer, and the output is connected to the automatic optimizer. Sources of information taken into account in the examination 1. USSR author's certificate f 58 and 29, cl. G 01 N 31/16, 1976.