Device for level control of conductive liquids

 

(57) Abstract:

Purpose: level control of conductive liquids. The inventive device includes an electrode level sensor mounted on a grounded metal container with a controlled conductive fluid, symmetrical trinistor load, the capacitor and the resistor. The anode of the symmetric trinistor connected to one terminal of the source of alternating intense to the other of the conclusions of which is connected to the second output load. The cathode trinistor connected to a common point load and a capacitor, and a control electrode with a common point of the capacitor and resistor . 3 Il.

 

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Ohmic transmitter // 2002211

FIELD: measuring engineering.

SUBSTANCE: device comprises fuel level indicator and rheostat pickup made of an analogue-digital converter with the balance input. The three-position switch is connected with the lever indicator. The device additionally has three resistive dividers, voltage stabilizer, and shunting resistor made of a 0.003-0.006-Om resistor. The rheostat level pickup is mounted inside the fuel tank vertically, and its linear horizontal size at this level is directly proportional to the area of the tank section in the horizontal plane at this level.

EFFECT: expanded functional capabilities.

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Level meter sensor // 2276333

FIELD: instrument engineering.

SUBSTANCE: level meter sensor comprises hollow rigid base with the port in its bottom end, diaphragm, strain gage converter with box, flexible spacer arranged over periphery of the box, and tube whose one end is mounted pressure-tightly in the port of the support and the other end is connected to the space of the box. The diaphragm is made of a rigid material and mounted on the flexible spacer for permitting cooperation with the strain gage converter.

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SUBSTANCE: the liquid level meter has a two-electrode capacitance sensor with an external 10 and interior 11 electrodes electrically connected with an electronic scheme having a stabilized source of power supply, an amplifier, a generator and a trigger. According to the first variant the capacitance sensor is fulfilled in the shape of a coaxial condenser "C". The interior electrode 11 of the sensor is fulfilled tubular and is mounted inside a fluoroplastic probing rod 12. The interior electrode 11 is connected to the input of a phase comparator which is additionally introduced in the scheme and whose output is connected with input of the trigger and the output of the last is provided with a line of delay and has two outputs - direct and inverse connected with a transistor key fulfilled with possibility of fulfillment of an operation "switched on" or "switched off". At that the electronic scheme is fulfilled on a digital integrated microchip. According to the second variant the interior electrode 11 of the coaxial condenser "C" is fulfilled tubular and is additionally provided with a protective shield 22. The shield 22 is fulfilled in the shape of a spiral spring out of bronze and electrically connected with the external electrode - the body 10 of the coaxial condenser "C".

EFFECT: increases sensitiveness and accuracy of measuring of the level of liquid.

6 cl, 4 dwg

FIELD: invention refers to control-measuring technique and is assigned for control and signaling about border of interface between mediums petroleum product-water in installations for purification water from petroleum products or watered petroleum products from water.

SUBSTANCE: sensor has flange, three electrodes with sleeves on their low ends filled with fresh water, moreover two of them are covered with dielectric insulation. Electrodes with sleeves are located inside tube of protective screen and are fastened in flange with aid of stuffing boxes-insulators. Screen in upper part has diaphragm ring with openings along circumference coinciding with openings in screen forming swinging compensator and is fastened to flange with aid of screws. Electrodes of sensor together with sleeves and electronic part form oscillating contour going in resonance at presence in space between electrodes of electric conductive medium (water) with following triggering of executive elements and at presence of water between electrodes of petroleum product resonance of contour stops.

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2 cl, 1 dwg

FIELD: physics, measurement.

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13 cl, 3 dwg

FIELD: measuring technology.

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42 cl, 14 dwg

FIELD: physics.

SUBSTANCE: method if based on measuring capacitance of a double-electrode capacitive liquid level sensor, which in turn in any sequence measures capacitance of the double-electrode capacitive liquid level sensor and capacitance of the same sensor is measured after connecting a capacitive sensor of dielectric properties to it, after which the level h from the upper end of the double-electrode capacitive liquid level sensor is calculated using the formula:

, where h is the level of the liquid in the reservior; CA is capacitance of the double-electrode capacitive liquid level sensor; CB is overall capacitance of the double-electrode capacitive liquid level sensor connected in parallel to the capacitive sensor of dielectric properties; A, B and D are structural parametres of the double-electrode capacitive liquid level sensor and capacitive sensor of dielectric properties. The device for measuring liquid level has a double-electrode capacitive liquid level sensor made in form of a coaxial capacitor, and two cylindrical electrodes. The lower end of the inner electrode of the double-electrode capacitive liquid level sensor is connected to one of the electrodes of the capacitive sensor of dielectric properties through the closing contact of a reed relay, and the lower end of the outer electrode of the double-electrode liquid level sensor is connected to the second electrode of the capacitive sensor of dielectric properties.

EFFECT: high accuracy of measuring the level of different liquids, as well as elimination of measurement errors caused by change in dielectric permittivity of the measured liquid.

2 cl, 1 dwg

FIELD: physics.

SUBSTANCE: sensor for monitoring the level of a liquid has a housing and a printed-circuit board on which there is a substrate having one or two identical film resistors (thermistors) and contact pads (conductors). The printed-circuit board is in form of a plate, one short side of which is rigidly attached to the base of the housing and on the edge of the opposite free side there is a hole whose diameter is 2…4 times larger than the width of the substrate lying over the hole and made from thin heat-insulating material. Each film resistor (thermistor) is in 'point' form with dimensions in the range (0.15…0.5) mm • (0.5…0.5) mm and thickness not more than 0.0005 mm. The boundary surface between each film resistor (thermistor) and contact pads of the substrate (conductors) is in form of broken lines consisting of straight sections.

EFFECT: high mechanical strength of the structure.

3 dwg

FIELD: analytical methods in food industry.

SUBSTANCE: method comprises providing food sample, adding it to separating funnel with filter, adding extractant, stirring resulting mixture, separating miscella by aspiration from separating funnel, distilling extractant therefrom, removing non-lipid substances from extract lipids, and weighing lipids. Distinguishing feature of invention is that stirring of extract mixture is accomplished via throwing off pressure in separating funnel until pressure provides boiling of extractant, whereupon pressure is returned to its initial value.

EFFECT: increased productivity of examination due to accelerated recovery of lipids and significantly prolonged service time of filter.

FIELD: food-processing industry.

SUBSTANCE: method involves determining content of extractive substances, ash and caffeine in coffee sample by extracting coffee sample with boiling distilled water; bringing extract to predetermined dilution extent; measuring its light transmission within wavelength range of 200-360 nm; calculating on the basis of resultant data qualitative factors by predetermined dependences.

EFFECT: reduced labor intensity owing to reduced number of series tests.

3 ex

FIELD: food-processing industry.

SUBSTANCE: method involves determining content of extractive substances, ash and caffeine in tea by extracting tea sample with boiling distilled water; bringing extract to predetermined dilution extent and measuring its light transmission within wavelength range of 200-359 nm; calculating enumerated quality factors on the basis of measurement data by predetermined dependences.

EFFECT: reduced labor intensity owing to reduced number of series tests.

1 tbl, 1 ex

FIELD: sugar industry.

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EFFECT: simplified process for determining purity of saturated molasses and increased precision of obtained data referring to purity of molasses.

3 tbl, 1 ex

FIELD: biotechnology, amino acids.

SUBSTANCE: invention relates, in particular, to a method for analysis of fodder agents, fodder supplements and other preparations comprising lysine and methionine. For determination of the content of free amino acids lysine and/or methionine in fodder agents method involves preparing fodder agents solutions and amino acids in prepared extracts are converted to their dansyl derivatives, and their content in solution is determined by method of capillary electrophoresis. By obtained data the content of free lysine and methionine is calculated in analyzed sample of the fodder agent. Method provides rapid and reliably determination of the content of free lysine and methionine in fodder agents.

EFFECT: improved assay method.

3 cl

FIELD: technology for post-gathering seed treatment by fractionation.

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EFFECT: simplified treatment technology; increased yield of the first grade seeds.

1 dwg

FIELD: sugar industry.

SUBSTANCE: the method provides for determination in the source molasses of the content of dry substances, sugar and nonsugar. A sample of molasses is heated up to several times by distilled water up to attainment of the content of dry substances after the last dilution by 3 to 5% below the source one. The content of dry substances (DSdiluted) and the electrical resistance (Rdiluted) are measured after each dilution of the sample. Their interrelation is determined in the form of linear relation: DSdiluted=aRdiluted+b, where a, b - numerical coefficients determined experimentally. Crystals of sugar are dissolved in the diluted sample of molasses up to attainment of saturation. Electrical resistance is measured in the sample, and the content of dry substances in it is determined according to the equation mentioned above. Calculation of purity of saturated molasses at a temperature of centrifugation of the fillmass of the last product is performed according to the known mathematic formula with the use of the obtained value of content of dry substances in the saturated sample of molasses.

EFFECT: provided sufficient simplicity of determination of purity of saturated molasses, enhanced precision of the obtained data relative to the indicated purity.

1 ex, 3 tbl

FIELD: food industry.

SUBSTANCE: method is based on measuring limit load of noodles and limit deformation thereof due to determining distance between table supports, provided by outer diameter of analyzed noodles and setting speed of loading of indenter, applied to noodle, equal to 10±1 g/f. calculation of characteristics like hardness limit and resilience module of dry noodles is performed with consideration of their limit loading force, limit deformation, distance between table supports and values of their inner and outer diameters.

EFFECT: higher precision.

2 dwg, 3 tbl, 1 ex

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