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.
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.
FIELD: measuring engineering.
SUBSTANCE: method comprises pressing unit reinforced by electrodes with simultaneous forming of insulator between the electrodes. The space that is defined by surfaces of the electrodes is filled with casting plastic mass. The pressure tightness is provided by tightening the insulator with electrodes by means of a nut.
EFFECT: enhanced reliability.
FIELD: the invention refers to measuring technique and may be used for controlling bulk and liquid materials.
SUBSTANCE: the oscillating indicator of a level has a sensible element( a probe) 1 connected with an anchor 2, a driving arrangement 4 in the shape of a coil with a ferromagnetic core and also a sensor 5 of the displacements of the anchor, a drive-pulse generator 6 and an amplifier 7 and a relay block 9 successively connected. The amplifier is spanned with a regulated negative feedback fulfilled in the shape of a resistor 8. The sensor 5 of the displacements of the anchor may be fulfilled in the shape of a coil with a ferromagnetic core. At that the section of the anchor 2 between the coils is fulfilled out of non-magnetic material that prevents electromagnetic connection between the coils providing protection from high frequency oscillations in the system anchor-coil-amplifier.
EFFECT: allows to control the levels of the bulk and liquid materials being present in aggressive mediums, under pressure,( discharge)and at temperature till 200 degrees.
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.
EFFECT: enhanced reliability and simplified structure.
FIELD: the invention refers to the field of instrument making and designed for control of the level of dielectric and current conducting liquids in hydraulic systems (fuel, freezing, accumulative etc) for example the level of oil or cooling agent in transport vehicles.
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.
EFFECT: increases reliability of work of sensor.
2 cl, 1 dwg
FIELD: physics, measurement.
SUBSTANCE: invention is related to the field of facilities for automation of different liquids level detection in industrial and household reservoirs, and also for detection of liquids availability and flow in pipelines. Method is based on application of two thermistors that have identical thermal characteristics, and includes heating of one of the thermistors by electric current and its cool-down due to heat transfer to environment, periodic measurement of voltage drop at thermistors, calculation of informative parameter, its comparison with threshold value and making decision on availability or unavailability of liquid at controlled level. At that one of thermistors is periodically heated by short pulses from power supply source. After heating is completed, ratio of non-heated and heated thermistors' voltages are repeatedly measured, and as informative parameter scaled time derivative is calculated by means of specified ratio measurement results array processing. Device for method implementation contains two thermoresistors, which are installed in sensitive element, connected to power supply source and which have temperature resistance coefficients (TRC) of the same sign and identical coefficient of heat emission in gas. Besides, it also contains analog-digital transducer and comparator, reference inlet of which is connected to source of reference signal, and outlet is connected with actuating device. Moreover, device is equipped with pulse switch and serially connected regulator of heating time and synchroniser, and also calculator of scaled derivative. For alarm on liquid flow availability, device is additionally equipped with the second comparator that is connected parallel to the first one, and the second actuating device.
EFFECT: higher efficiency of liquid level detection by increase of device actuation fast-action, reduction of power inputs and expansion of its application field.
13 cl, 3 dwg
FIELD: measuring technology.
SUBSTANCE: invention refers to a measuring device for determination of an amount d(V(z)) of conducting liquid of the conductivity LF by a capacity with vertically (z-direction) varied filling points. There is provided conductivity metre which among others has at least two electrodes extended in a z-direction. The capacitance parametres and/or the metres are ensured so that it/they can be described by means of at least one parametric function, fpi (V(z)) depending on V(z). At least one said parametric functions shall have exponential dependence on V(z). There is also described measuring element, and also method for determination of total amount of flowing liquid d (V).
EFFECT: simplified design of the device and method of measuring conductivity of the conducting liquid.
42 cl, 14 dwg
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
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.
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.
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.
SUBSTANCE: method involves determining content of dry substances, sugar and non-sugar components in basic molasses; heating molasses sample until the latter reaches unsaturated state and solving therein sugar crystals vibrating in netted cylinder until it becomes saturated; during saturation process, measuring electric resistance Rmeas of molasses; determining current values and possible maximal value of dry substance content in unsaturated molasses on the basis of preliminarily set dependence between electric resistance Rmeas and dry substance content DSmeas, said dependence being described by linear equation: DSmeas=a Rmeas+c, where a, c are experimentally determined digital coefficients; calculating purity of saturated molasses at temperature of centrifuging of final massecuite from known mathematic formula with the use of obtained value of maximal dry substance content in saturated molasses sample.
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.
FIELD: technology for post-gathering seed treatment by fractionation.
SUBSTANCE: claimed method includes two steps. In the first step corn boodle is separated to obtain waste, feedstuff and seed fractions. In the second one fractions are treated to obtain desired seed conditions. Before the second step corn boodle is classified on the base of laboratory seed fertility. On the base of obtained results optimal parameters for pneumatic and inertia fractionation as well as for shaker fractionation are determined In the second step pneumatic and inertia fractionation is carried out to isolate remaining part of biologically defective corn. Then shaker fractionation is carried out to isolate fraction with the first grade of laboratory seed fertility from residual corn boodle.
EFFECT: simplified treatment technology; increased yield of the first grade seeds.
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