SU817571A1

SU817571A1 - Capactive sensor for cocenrating solutions and suspensions

Info

Publication number: SU817571A1
Application number: SU792727063A
Authority: SU
Inventors: Евгений Николаевич Урусов; Геннадий Александрович Морошкин; Виктор Иванович Сахненко; Владимир Петрович Катушкин
Original assignee: Ленинградский Ордена Трудовогокрасного Знамени Технологическийинститут Имени Ленсовета
Priority date: 1979-02-21
Filing date: 1979-02-21
Publication date: 1981-03-30

Description

1one

Изобретение относитс к измерительной технике, в частности к электрическим измерени м неэлектрических величин , и модет быть использовано в химической ,, нефтехимической, химикофармацевтической , пищевой и других отрасл х промышленности.The invention relates to a measurement technique, in particular to electrical measurements of non-electrical quantities, and can be used in the chemical, petrochemical, chemical-pharmaceutical, food and other industries.

Известен датчик дл измерени концентрации кoнтpoлиpye aлx сред, например пластинчатый f .A sensor is known for measuring the concentration of the control medium of all media, such as plate f.

Однако у известного датчика низка чувствительность.However, the sensitivity of the known sensor is low.

.Наиболее близким техническим решением вл етс емкостный датчик, содержащий основание сферической формы, о электродами 2 .The closest technical solution is a capacitive sensor, containing a spherical base, with electrodes 2.

Основным недостатком известного датчика вл етс невысока нувствитёльность вследствие значительного рассто ни между потенциальным и нулевыми электродами. Кроме того, не- возможность измерени в зких суспензий, так как не исключена возможность забивки межэлектродного пространства.The main disadvantage of the known sensor is the low sensitivity due to the considerable distance between the potential and zero electrodes. In addition, the inability to measure viscous suspensions, since the possibility of driving the interelectrode space is not excluded.

Цель изобретени - повышение чувствительности и точности измерений концентрации.растворов и суспензий.The purpose of the invention is to increase the sensitivity and accuracy of concentration measurements of solutions and suspensions.

Поставленна цель достигаетс тем, что датчик сферической формы выполйен из изолирующего материала с токо-The goal is achieved by the fact that the spherical sensor is spun out of an insulating material with current

провод щими электродами в виде сферических треугольников, расположенных таким образом, что вершина одного сферического треугольника находитс между боковыми гран ми двух соседних треугольников, основани которых соединены с противоположными полюсами сферы.conductive electrodes in the form of spherical triangles arranged in such a way that the apex of one spherical triangle lies between the side faces of two adjacent triangles whose bases are connected to opposite poles of the sphere.

Благодар такому выполнению чувствительного элемента образуетс конденсатор с краевым полем, увеличивающим геометрическую емкость датчика, что влечет за собой повышение его чувствительности .Due to this embodiment of the sensing element, a capacitor is formed with an edge field that increases the geometric capacitance of the sensor, which entails an increase in its sensitivity.

На фигЛ изображена конструкци предлагаемого датчика, на фиг.2 функциональна схема, по сн юща работу датчика.FIG. 2 shows the construction of the proposed sensor, FIG. 2 is a functional diagram explaining the operation of the sensor.

Claims

The sensor is a ball 1 with a hole passing through the poles and ending with conical bores. On the surface of the ball deposited electrodes 2 and 3 in the form of spherical triangles. Through the hole in the center of the ball passes a hollow holder 4, ending with fifth 5. Bevel seals b serve to seal the system. The shielded cable 7 is connected to the electrodes on the contact surface of the poles 8 and E. The sealing system is carried out by means of the washer 10 and the nut 11. The sensor operates according to the principle of changing the capacitance from changing dielectric strength or conductivity depending on the class of medium being controlled by the reactor 12. Date Chick 13 is installed on the holder 14. The signal from the sensor is fed to the electronic unit 15, the converter 16, the recording unit 17, is calibrated in percentage terms of the concentrate, .. The operation of the sensor is based on changes, changes capacitance depending on changes in the dielectric constant of the measured medium, which in turn is associated with changes in the concentration of solutions and suspensions. Prior to the measurements, the sensor and scale of the secondary device 17 (Fig. 2) are calibrated with the help of standard solutions -the device is made as a percentage of concentration. During the measurement, the signal from the sensor enters the measuring circuit of the electronic unit 15, is converted into a standard signal by the block 16 and is recorded by the secondary device 17. The electronic unit uses the principle of an inductive-capacitive neutral bridge powered by a high frequency generator. i The use of the proposed sensor will allow solving the problem of automatically controlling the concentration of media with significant changes in their properties during the technological process and increases the sensitivity of the system, on average, by 20-30%. The invention of the capacitive concentration of solutions and suspensions containing the base of a spherical form with electrodes, depending on the fact that, in order to increase the sensitivity and accuracy of measurements, the electrodes are made in the form of spherical triangles arranged in such a way that the top of one spherical triangle is located between the side faces of two adjacent, the bases of which are connected to the opposite poles of the sphere, and the base of the sensor is made of a material that is resistant to aggressive media rial Sources of information taken into account during the examination 1. USSR author's certificate No. 305401, cl. G 27/22, 1970.

2. The patent of Germany No. 802344, cl. 24 i 5/01, 1949 (prototype).