SU1257502A1 - Method of cleaning electrodes in transducer of ph-meter - Google Patents

Abstract

The invention relates to instrumentation technology and can be used in instrument making. The purpose of the invention is to increase the efficiency of electrode cleaning by providing cavitational erosion of contaminants. The method consists in placing the active part of the measuring and auxiliary electrodes in the tank, into which the liquid with measured pH is supplied with a speed that ensures its cavitation, and the electrodes are placed in the plane of the middle section of the initial part of the jet in the whirlpool zone. on electrodes and reducing consumable fluid. The bones are drained from the tank through a siphon pipe under the level. 1 hp ff, 1 ill. you ate about

Description

The invention relates to methods for cleaning rI-met1) a electrodes and can be used in instrument engineering for chemical petroleum, microbiological and other industries.

The purpose of the invention is to increase the cleaning efficiency of electrodes by providing cavitation erosion of contaminants.

The drawing shows the pH sensor meter, section.

The sensor includes a container 1, a supply pipe 2, a discharge pipe 3, a nozzle 4, a valve 5, electrodes 6 and a siphon 7.

Cleaning electrodes pH meter as follows.

The valve 5 opens and the liquid flows under pressure to the tank 1. After the tank I is filled, the siphon pipe 7 is filled.

A jet of fluid creates a swirl

the zone located between the jet boundaries and the walls of the tank 1, and cavitation occurs in the stringed layer due to the absence of extraneous flow (at the contact point of the two layers), and the pressure in the inlet pipe must be such as to ensure the velocity of the jet, sufficient for the occurrence of cavitation in the tank 1. Part of the resulting vapor-gas puffers entering the whirlpool zone due to the discharge created by the jet itself, and moves with the stream in the whirlpool zone and upon meeting the surface of the active part from A measuring electrode installed in the plane of the middle section of the initial part of the jet, which is an obstacle to the accelerated flow, causes cavitation erosion of the gypsum-like film and continuous cleaning of the electrodes from viscous particles.

Example. A control cleaning of the electrodes coated with a hypoxic substance in the form of a film was carried out.

For this purpose, into a cylindrical container in the cross section of which is an ellipse, whose small axis is equal to the length of the initial part of the jet, greater than 2.5 of its length, through the inlet pipe

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The post-fervine brew was filled with gypsum-like substances dissolved in it, under the pressure of an adjustable valve 5.

Increased the rate of fluid outflow until cavitation started to occur in the fluid, as observed by the abundant release of vapor-gas bubbles.

Cavitation in the post-yeast brew, at its temperature in and the indicated dimensions of the chamber, appears at a pressure of 0.4 atm at a pressure in the feed nozzle 2. After closing the lid with electrodes mounted into it, the measuring parts of which were located in the plane of the middle section of the initial section at a distance of 0.5 of its length from the jet axis.

In order to improve the cavitation conditions, a two meter long siphon pipe 7 was connected to the outlet nozzle 3.

During the four hours the complete cleaning of the measuring parts of the electrodes was achieved, and the measured potential difference stabilized with respect to the readings of the reference pH meter.

Claims (2)

1. A method of cleaning electrodes in a pH meter sensor, which consists in immersing electrodes in a container with the analyzed liquid, feeding the container of the analyzed liquid under pressure through a nozzle in its bottom and with the liquid through a nozzle located in the upper part of the tank, while simultaneously measuring potentials, characterized in that, in order to increase the cleaning efficiency of the electrodes by providing cavitation erosion of contaminants, the liquid is fed into the container With a speed that ensures its cavitation, and the electrodes are placed in loskosti average primary jet sectional area in the cavitation zone. 2. A method according to claim 1, characterized in that the liquid is drained from the container through a siphon pipe Editor A. Dolinich Compiled by E. Anisimov Tehred L, Oleynik Proofreader T. Kolb Order 4909/40. Circulation 778 Subscription VNIIPI USSR State Committee. for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4