Device for measuring the fuel level in the tank
(57) Abstract:The inventive device includes a measuring capacitor with profiled parallel plates connected through the generator and frequency counter to the indicator. The capacitor is located inside the sealed magnetoresitive tube, which can move is a circular float with permanent magnet interacting through a magnetic field with the ferromagnetic insert mounted on the movable slider established between the capacitor plates, the sides of the slide adjacent to the plates of the capacitor is deposited dielectric and electrically connected the conductive coating and the width of the shaped conductive plates in each horizontal section is directly proportional part of tank volume bounded from above this horizontal section. 2 Il. The invention relates to a device for measuring liquid level and can be used in the automotive industry to measure the level of fuel in the tank of the car.The prototype of the invention is a device containing a capacitive sensor connected across the generator and frequency counter to indikatoren due to the large deviation of the dielectric constant of the fuel.The aim of the invention is to improve the accuracy of measurements and reliability.This goal is achieved by a device for measuring the fuel level in the tank of a complex profile. The device comprises a capacitive sensor electrodes which is made in the form of a profiled parallel plates arranged vertically in the tank and connected to the generator input, the output of which through the frequency counter is connected to the indicator, and the capacitor is located inside the sealed tube, which can move is a circular float with permanent magnet interacting through a magnetic field with the ferromagnetic insert, fixed slider established between the plates of the measuring capacitor, and on the sides of the slide adjacent to the plates, deposited conductive and dielectric coatings, conductive coatings are interconnected by conductive vias, and the width of the profiled plates each horizontal section is directly proportional part of tank volume bounded from above this horizontal section.Diagram of the device shown in Fig. 1; Fig. 2 shows the plate condensates contains the measuring capacitor with profiled installed in parallel vertical plates 1 and 2, located inside the sealed magnetoresitive tube 3. Plates 1 and 2 is made, for example, in the form of a printed circuit Board with a dielectric substrate 4 and the conductive areas 5, the width of which in each horizontal section is directly proportional part of tank volume bounded from above this horizontal section. Conductive areas 5 plates connected to the input of the generator 6, the output of which through the counter 7 is connected to the indicator 8. Between the plates 1 and 2 set the slide 9, on the two sides of which are adjacent respectively to the plates 1 and 2, deposited dielectric 10 and 11 conductive coating and the conductive coating is connected between a conductive jumper 12. On slide 9 of the pinned ferromagnetic insert 13. On the external side of the tube 3 comprises an annular float 14 with a possibility of free movement in the tube containing the permanent magnet 15, interacting through a magnetic field with an insert 13. In the tank 16 is fuel.The device operates as follows.When changing the fuel level in the tank 16, the float 14 is moved along the tube 3 and drags the slider 9, which moves between the plates 1 and 2 of the capacitor. When this container is directly proportional to the amount of fuel in the tank. In accordance with the magnitude of this capacity is installed, the frequency generator 6, which is measured by the frequency counter 7, and the measurement result in the indications of the quantity of fuel in the tank is displayed on the display 8.The device is excluded the error due to the lack of data about the temperature and the dielectric constant of the fuel. In addition, virtually eliminating friction between the slider and the capacitor plates, which allows you to more easily move the slider by means of a float with a magnet that reduces static measurement error. In General, increases the accuracy and reliability of the device. DEVICE FOR MEASURING the FUEL LEVEL IN the TANK containing the capacitive sensor connected to the generator, connected through the frequency indicator, wherein the capacitive sensor is located in a sealed magnetoresitive the tube, which can move is a circular float with a permanent magnet, is arranged to interact with the ferromagnetic insert mounted on the movable slider established between the electrodes of the capacitive sensor, while on the sides of the slide adjacent to the electrode capacitance of the capacitive sensor is made in the form of profiled plates, width in each horizontal section is directly proportional to the part of the tank bounded from above this horizontal section.
FIELD: measurement technology; high-accuracy determination of liquefied gas mass in reservoir irrespective of its phase.
SUBSTANCE: three RF sensors of different length are placed in reservoir filled with liquefied gas. Sensors are connected to secondary converter. Length of first sensor vertically placed in reservoir corresponds to height of reservoir. Length of second vertical sensor is reduced from below by value no more than 0.35 of length of first sensor. Third sensor is located in gas phase of liquefied gas and its length is no more than 0.3 of length of first sensor. Each sensor may be connected to frequency-setting circuit of respective self-excited oscillator.
EFFECT: enhanced measurement accuracy; extended field of application.
2 cl, 3 dwg
FIELD: measuring engineering.
SUBSTANCE: water level alarm comprises the section of coaxial long line provided with inner conductor projecting beyond its end. The section is connected with the high-frequency generator and recorder. The generator is made of a self-excited oscillator. The section is connected to the frequency generating circuit of the self-excited oscillator. The recorder is made of a frequency meter. The projecting part of the inner conductor is made of two members of the same length, but different diameters. The diameter of the end part exceeds that of the other part of the projecting part of the inner conductor by a factor of ten. The projecting part of the conductor can be covered with a dielectric shell.
EFFECT: enhanced sensitivity.
1 cl, 5 dwg
FIELD: measuring equipment engineering.
SUBSTANCE: device has excitation winding, fed by alternating current and measuring winding, connected to alternating voltage meter. Both windings are enveloped by protective cover, placed in controlled electric-conductive environment. To provide for high sensitivity to level of environment and decrease of temperature error from influence of construction materials, conductors of measuring winding are distanced from excitation winding conductors for distance, equal to one to ten sums of thickness of protective cover and radius of excitation winding cable cover. Also provided are different variants of constructions of level meters both with solenoid and frame windings.
EFFECT: higher precision.
7 cl, 5 dwg
FIELD: measurement technology.
SUBSTANCE: first measurement of level of liquid is performed from value of measured electric capacitance C1 of first radio-frequency detector. Density of gaseous phase is determined on the base of value of electric capacitance C3 of corresponding radio-frequency detector. Simultaneously the second measurement is performed of level of liquid in reduced or increased range of change on the base of measured value of electric capacitance C2 of corresponding radio-frequency detector. Then functional conversion of measured electric capacitances C1, C2 and C3 is performed and dielectric permeability of liquid and gaseous phases is measured.
EFFECT: improved precision of measurement; widened functional capabilities.
FIELD: electric engineering equipment.
SUBSTANCE: device can be used for measuring electric parameters of two-terminal devices used as physical process detectors (temperature, pressure, level of loose and liquid matters and et cetera) at transportation vehicles and in systems for measuring level of filling of rocket-space equipment. Device for measuring level of dielectric matter has first and second measuring inputs, sinusoidal voltage source, equivalent circuit preset unit, standard which has first output connected with first input of switching unit, current-to-voltage converter, scaling amplifier and analog-to-digital converter. Switching unit is made to be multi-channel one, which has first measuring, input with second output of standard and with output of sinusoidal voltage generator. Control input of the latter is connected with first output of frequency-control unit. Measuring inputs starting from second to (n+1) are connected with corresponding inputs of switching unit which has output connected with first outputs of electric capacity and active resistance calculators through current-to-voltage converter, scale amplifier and analog-to-digital converter all connected in series. It is also connected with first input of measurement control input which has outputs connected with control inputs of switching unit, of scale amplifier and analog-to-digital converter as well as with first input of frequency control unit and with second inputs of electric capacity and active resistance calculators. Control input of measurement control unit is connected with control output of mode control unit which has outputs connected with second input of frequency control unit, with equivalent circuit setting unit, with first input of electric capacitance total increment calculator, with first input of level calculator, with first input of electric capacitance current increment calculator and with input switching control unit. Output of the latter is connected with second control input of switch unit. Output electric capacitance calculator is connected with second input of calculator of current increment in electric capacitance. Output of the latter is connected with second input of level calculator. Third and fourth inputs of electric capacitance and active resistance calculators are connected with output equivalent circuit preset unit and with second output of frequency control unit. Output of calculator of current increment in electric capacitance is connected with third input of level calculator. Output of the latter as well as outputs of active resistance calculator and switch control unit have to be outputs of the device.
EFFECT: improved precision of measurement; improved manufacturability; improved efficiency of measurement.
FIELD: electric measurement engineering.
SUBSTANCE: method can be used for measurement of electrical parameters of two-terminal networks used as detectors of physical processes (temperature, pressure, level of liquid and loose maters et cetera) at industrial installations, transportation vehicles and in systems for measuring level of setting-up of rocket-space equipment. Sinusoidal voltage is formed in capacitive level gauge and complex current is measured which passes through dry capacitive level gauge as well as through filled-in capacitive level gauge. Equivalent circuit of capacitive level gauge is specified which circuit consists of electric capacitance and active resistance. Sinusoidal voltage is formed in capacitive detector at two frequencies. After it complex current is measured through dry level detector and through reference detector for any of those frequencies. Results of measurement are registered, electric capacitance of capacitive level gauge is measured and registered and increment in electric capacitance of capacitive level gauge is measured and registered when submerging gauge into dielectric matter completely. Subsequent measurement and registration of complex current is carried out through capacitive level gauge filled with dielectric matter and through reference gauge for any of mentioned frequencies. For any periodical measurement the electric capacitance of capacitive level gauge is measured and registered. Relative filling of capacitive level gauge with dielectric matter is measured as difference of values of electric capacitance of dry capacitive level gauge and electric capacitance of filled-up capacitive level gauge related to increment in electric capacitance of capacitive level gauge submerged into liquid totally.
EFFECT: improved precision of measurement; improved adaptability to manufacture.
FIELD: measuring equipment engineering, possible use for measuring level of liquid products, in particular, oil and oil products in railroad cisterns.
SUBSTANCE: level meter for measuring level of liquid contains bar with single capacity level indicators, positioned along its length, bar is made in form of hollow elongated construction, inside the construction a pair of electronic boards is positioned in form of rods, mounted in parallel to one another and at fixed distance from each other, forming single capacity level indicators on opposite planes facing each other, by means of electrodes on one electronic board and common electrode on the other board. When measuring level of liquid, serial scanning of indicators is performed in pairs of following indicator with previous one and on basis of received scanning results, level of liquid is calculated.
EFFECT: increased manufacturability, reliability and precision when measuring level of liquid product.
2 cl, 2 dwg
FIELD: measuring level of melt metals, possibly in systems for controlling manufacturing processes in metallurgical industry, for example in apparatuses for thermal-magnetic reduction of titanium.
SUBSTANCE: device includes exciting windings and metal level pickups in the form of induction turns, computing unit. Said windings and level pickups are placed in pairs around vessel with melt metal. Computing unit is connected with level pickups. It provides possibility for scanning pickups, digitizing voltage values of pickups, approximating pickups readings of designed curve found according to decision of simulation task, calculating derivative of said curve and determining metal level according maximum value of derivative. Excitement windings of device are connected in series and they form electromagnet.
EFFECT: enhanced accuracy, lowered labor consumption of measuring process.
2 cl, 3 dwg
FIELD: measuring technique.
SUBSTANCE: fuel level meter comprises elongated capacitive sensor connected in the frequency-generating circuits of functional and base self excited oscillators. The main and additional counters generate the position code of the fuel level from the output frequencies of the self-excited oscillators. The level is indicated by the linear or pointer indicator provided with a converter of position code into the current of supplied to the pointer indicator.
EFFECT: reduced power consumption and enhanced reliability.
2 cl, 2 dwg
FIELD: measuring equipment engineering.
SUBSTANCE: holding system for measuring device for controlling and/or determining level of environment in reservoir, containing at least one body (13) and at least one elongated block (1). In accordance to invention, body (13) of device includes at least one incision ring (4), which is cut into external layer of elongated block (1) oriented from end process with possible connection of elongated block (1) to body (13) of device electrically, with resistance to compression and stretching.
EFFECT: creation of holding system, by means of which holding block may be fastened on or in a body of device.
8 cl, 3 dwg