SU771536A1

SU771536A1 - Sensor of gase concentration

Info

Publication number: SU771536A1
Application number: SU782705300A
Authority: SU
Inventors: Александр Маркович Шехтман; Анатолий Терентьевич Парфенов
Original assignee: Научно-Исследовательский Технохимический Институт Бытового Обслуживания
Priority date: 1978-12-29
Filing date: 1978-12-29
Publication date: 1980-10-15

Description

1one

Изобретение относитс к технике измерени неэлектрических величин электрическими способами, а точнее к датчикам, служащим дл измерени концентрации паров уайт-спирита в 5 воздухе производственных помещений.The invention relates to the technique of measuring non-electrical quantities by electrical methods, and more specifically to sensors, which serve to measure the concentration of white spirit vapors in 5 air of industrial premises.

Известен разр дный детектор (датчик ) , который работает на принципе изменени тока, коронного разр да в воздухе при наличии в нем паров раз- 10 личных химических веществ ЗД .A discharge detector (sensor) is known, which operates on the principle of changing the current, corona discharge in air in the presence of vapors of various HV chemical substances in it.

Ввиду низкой стабильности своей работы разр дные датчики, в которых используетс коронный разр д, не нашли широкого применени по той t5 причине, что их катод, выполн емой обычно из металлической иглы, подвержен загр знению инородными частицами , нарушающими равномерную эмиссию электронов с ее остри . . 20Due to the low stability of their operation, bit sensors using corona discharge have not been widely used for the reason that their cathode, usually made from a metal needle, is susceptible to contamination by foreign particles that violate the uniform emission of electrons from its point. . 20

Наиболее близким техническим решением вл етс датчик концентрации газов, содержащий катод, выполненный в виде коронирующей иглы, и анод, выполненный в виде вращающихс круг- 25 лых электродов, снабженных щетками 2.The closest technical solution is a gas concentration sensor containing a cathode made in the form of a corona needle and an anode made in the form of rotating circular electrodes equipped with brushes 2.

Указанный датчик не может быть применен дл измерени концентрации паров уайт-спирита по той причине, 30The specified sensor cannot be used to measure the concentration of white spirit vapors for the reason 30

что ток отрицательного коронного разр да не измен етс при наличии в воздухе указанных паров.that the current of the negative corona discharge does not change when these vapor are present in the air.

Кроме того, указанный датчик по своей конструкции вл етс взрывоопасным , что исключает его применение в помещени х, в которых имеютс пары уайт-спирита.In addition, this sensor is explosive in its design, which precludes its use in rooms in which there are white spirit pairs.

Целью изобретени вл етс расашрение функциональных возможностей устройства.The aim of the invention is to extend the functionality of the device.

Указанна цель достигаетс тем, что известный датчик коронного разр да , содержащий катод, выполненный в виде коронирукщей иглы, и анод, выполненный в виде вращающихс круглых электродов, снабженных щетками, заключен во взрывобезопасный кожух, на входе и выходе которого установлены пламегасители и на входе которого установлен патрон с влагопоглощающим веществом, например, цеолитсм . При этом в датчике применен положительный коронный разр д.This goal is achieved by the fact that a known corona discharge sensor containing a cathode made in the form of a corona needle, and an anode made in the form of rotating round electrodes equipped with brushes are enclosed in an explosion-proof housing, at the entrance and exit of which are installed flame arresters and at the entrance of which A cartridge with a moisture-absorbing substance is installed, for example, zeolite. In this case, a positive corona discharge was applied in the sensor.

На чертеже изображен общий вид предложенного датчика в двух проекци х .The drawing shows a general view of the proposed sensor in two projections.

Claims

The sensor contains an explosion-proof casing 1, rotating electrodes 2, brushes 3, corona needle 4, flame arresters 5, moisture absorbing cartridges 6, electric motor 7 / rotating round electrodes, fan 8, toggle switch 9 and sensor cover 10. The sensor works as follows to electrodes Sensor 2 and 4 is supplied with a high voltage, plus to the corona needle, causing a positive corona row between the sensor electrodes. Before measuring the corona current, the round electrodes of the 2 sensors rotate with the motor motor 7 and the brushes 3 mounted on them clean the tip of the needle 4 of the sensor. When the sensor round electrodes are installed in the working position, i.e. when the brushes do not overlap the interelectrode space; The sensor round electrodes are automatically stopped by means of a toggle switch 9, and the fan 8 is turned on, providing air flow through the electrode space. When air passes through the desiccant cartridges 6, water vapors are removed from it, which makes it difficult to measure. The flame arresters 5 serve to prevent the flame from spreading in the case of a white spirit booster vapor inside the sensor. The signal from the sensor goes to the DC amplifier, then to the meter, which records the change in current, the value of which is inversely proportional to the white spirit's vapor concentration. the air. The use of a sensor for measuring the concentration of white spirit vapors will allow for the rapid analysis of air in the production premises of enterprises operating using the specified and similar chemical properties. A gas concentration sensor comprising a cathode made in the form of a corona needle and an anode made in the form of rotating round electrodes equipped with brushes, characterized in that, in order to enhance the functionality, the sensor is enclosed in an explosion-proof casing and contains flame arresters mounted on the entrance and exit of the casing, as well as a cartridge with a moisture-absorbing substance, mounted on the casing entrance. Sources of information taken into account in the examination 1.V. Brazhnikov. Differential detectors for gas chromatography. M., Science, 1974, p. 189.

2. USSR author's certificate number 595610, cl. F 26 21/14, 1975 (prototype),