RU33820U1 - Device for monitoring the concentration of solutions - Google Patents

Description

Device for monitoring the concentration of solutions

The utility model relates to test equipment and can be used for non-contact measurement of the concentration of solutions in various industries.

A known concentration meter according to ed. St. 1430872, MKI G 01 N 29/02, 1988, containing a piezoelectric element in contact with the pipeline, made in the form of a plate, and a press consisting of two blocks, covering the pipeline and interconnected by spindles and installed in the plane of the pipe section.

The disadvantage of the meter is the low accuracy of the measurement.

The closest in technical essence and the achieved result is, selected as a prototype, a non-contact device for measuring the concentration of solutions according to ed. St. 2150697, MKI G 01 N 29/02, 2000, containing a filter settler, a gas separator, a measuring unit, including a piezoelectric transducer and a fixture for mounting it and a flaw detector. The disadvantage of this device is the design complexity and low measurement accuracy.

The method for monitoring the concentration of solutions, implemented in the known device, is based on direct measurements of the time of reception of the reflected echo signal. Exposed particles and gas bubbles in the solution cause the amplitude and echo signal to randomly change (decrease), in addition, a spurious signal appears in the form of noise at the output of the flaw detector. Therefore, to stabilize the parameters of the received echo signal, the device includes a filter sump, the functions of which include cleaning the solution from suspended particles, and a gas separator. In this case, the filter sump needs periodic cleaning, during which it is necessary to stop

flow of the solution and interrupt the control process. In addition, to implement the method of introducing ultrasonic vibrations into a controlled solution through a lid, the thickness of which at the point of attachment of the piezoelectric transducer (hereinafter PEP) should be equal to the half-wavelength of these oscillations, it is necessary that the wavelength be constant, which is practically impossible if the need to replace the probe due to the spread of their operating frequencies. In the case of inequality of the thickness of the cover at the attachment point of the piezoelectric transducer to the half-wavelength, the condition for the complete passage of the ultrasonic signal is violated. The reflected echo will have several maxima, which will lead to the appearance of an additional error and a decrease in the control accuracy. It should be noted that to increase the accuracy of measuring the time of reception of the reflected echo signal, the duration of the probe pulse should be as short as possible, i.e., the working frequency of the ultrasonic signal should be quite high, but in this case, when operating, for example, at a frequency of 5 MHz , the thickness of the steel cover at the attachment point of the piezoelectric transducer equal to the half-wave length should be only 0.6 mm, which is not permissible under any operating conditions.

The objective of the utility model is to increase the measurement accuracy and simplify the design of the device.

The problem is solved in that the solution concentration control device comprising a measuring unit, an ultrasonic flaw detector and an information collection and processing system, according to the utility model, the measuring unit is made in the form of a nozzle to which a piezoelectric transducer is attached to the side wall so that it the surface is directly in the controlled solution, and the pipe wall opposite from the piezoelectric transducer serves as a reflector, and the distance from ayuschey surface of the piezoelectric preobrazovate2 middle to the reflector is known, the system of collection and processing of information is made on the basis

a personal computer, connected to a flaw detector and collects data on the parameters of the reflected signal, analyzes them, calculates the concentration of the solution and displays information on the display.

The specified set of features is new, unknown from the prior art and allows us to solve the problem, since the radiation of an ultrasonic signal directly into a controlled solution allows to increase the measurement accuracy by eliminating the influence of the cap on the shape of the echo signal; the presence in the installation of a system for collecting and processing information based on a personal computer allows, through the selection of pulses of an ultrasonic signal with a maximum amplitude, to tune away from the influence of charged particles and gas bubbles, i.e. monitor contaminated and gas-contaminated solutions without the use of filters and degassers.

In FIG. 1 shows a device for monitoring the concentration of solutions.

In FIG. 2 shows the measuring unit of the device.

The device consists of a measuring chamber 1, a piezoelectric transducer 2, an ultrasonic flaw detector 3, and a system for collecting and processing information 4 made on the basis of a personal computer.

The device operates as follows.

The controlled solution under pressure passes through the measuring chamber 1. From the output of the ultrasonic flaw detector 3 generator, electric impulses are supplied to the probe 2. In PEP 2, electrical pulses are converted into mechanical pulses and emitted into a controlled solution. Propagating in the solution, probe pulses reach the opposite wall of the measuring chamber, are reflected from it and move in the opposite direction. Having reached the probe, the reflected pulses are again converted to electric ones and fed to the input of the receiving device of the ultrasonic flaw detector. From defect exit3

the scopes in the information collection and processing system 4 post data on the parameters of the probing and reflected signals (signal amplitudes and the delay time of the reflected signal relative to the probing). The system of obor and information processing captures this data and puts it in memory. After a certain time interval (for example, 1 second), the system compares the data on the reflected pulses received during this time and selects one pulse having the maximum amplitude value. Using data on the time of reception of this pulse, the solution concentration is calculated, and its value is displayed on the display screen.

Thus, the presence of suspended particles and gas bubbles in a controlled solution does not affect the control results.

Claims (1)

A device for monitoring the concentration of solutions containing a measuring unit, an ultrasonic flaw detector and an information collection and processing system, characterized in that the measuring unit is made in the form of a branch pipe, a piezoelectric transducer is attached to its side wall so that its radiating surface is directly in the controlled solution, and the pipe wall opposite from the piezoelectric transducer serves as a reflector, and the distance from the radiating surface of the piezoelectric the transducer to the reflector is known in advance, and the information collection and processing system based on a personal computer is connected to a flaw detector and collects data on the parameters of the reflected signal, analyzes them, calculates the concentration of the solution and displays the information on the display.