(57) Abstract:Usage: in the measuring technique can be used to measure the mass of dielectric liquids. The inventive tolevamer contains a level sensor 1, the reference capacitor 2, the voltage generator 4, amps DC 5, an adjustable amplifier 6. The sensor and reference capacitor included in the diagonal of the diode circulator, to another diagonal which is connected a DC amplifier, and the oscillator through an adjustable divider is connected to the connection point between the sensor and the reference capacitor. 1 Il. The invention relates to measuring technique and can be used to measure the mass of dielectric liquids, such as aviation fuels.Closest to the present invention is tolevamer that contains a level sensor with a pair of diodes, a current amplifier channel level sensor connected to its output indicator, generator periodic signal with a constant product of the voltage amplitude on the frequency, the sensor hub with a pair of diodes, a reference (constant) capacitor with its pair of diodes and a current amplifier of the reference channel. All diodes are placed in the liquid, i.e., have him pace the current is directly proportional to the current through the corresponding capacitor, define the capacitive resistance of the capacitor and the voltage drop at a particular diode in a particular half-cycle of the voltage generator. The summation of the constant current circuits of the compensator and the reference capacitor allows you to choose the gear ratio of the total chain depending on the ratio of the capacitances of these capacitors in accordance with the fuel index, and using a voltage amplifier channel compensation by converting this voltage into a current, offset current at the input of the amplifier channel level sensor, i.e., to compensate for the initial capacity level sensor.The prototype disadvantages are the complexity of the technical solution, due to the presence of the sensor compensator dielectric constant and the gain channel his power and presence of the truncation error caused by the existence of immeasurable amounts of fluid in the sensor zone compensation in the tank with the liquid.The aim of the invention is to improve the accuracy of measurement of the mass of fuel by eliminating immeasurable volume of the tank and simplification of the device.This is achieved by the fact that in electroelastic tolevamer containing the sensor and the reference capacitor, included the prison to the other diagonal of the diode circulator, adjustable amplifier connected between the generator voltage and the connection point of the sensor with the reference capacitor. Thus, there are no additional communication line and an additional measurement channel on the fuel temperature. Function armament perform diodes, rectifying currents of the level sensor and the reference capacitor. And to the capacitance sensor and temperature were multiplicative used the reference capacitor with a pair of diodes, the output current which is opposite in direction to an output current of the diodes of the level sensor. Adjustable air amplifier is a simple amplifier with the possibility of setting its gain voltage.The drawing shows a diagram of the proposed tolevamer.Electroelastic tolevamer contains a level sensor 1, the reference capacitor 2, four diode 3, the generator voltage AC 4, a DC amplifier sensor 5 and an adjustable amplifier 6.The output of the generator 4 is connected through an adjustable amplifier 6 to the connection point of the first plates of the sensor 1 with the reference capacitor 2, the DC amplifier 5 is connected to the cathode of the first and the anode of the fourth diode, the second of obedinena with the anode of the third and the cathode of the fourth diode.Tolevamer works as follows.In the connection point of the sensor 1 with the reference capacitor 2 is fed through an adjustable amplifier 6 voltage Uggenerator 4. Output current sensor 1 according to the scheme has a negative polarity, and the output current of the reference capacitor 2 positive polarity. If the capacitance of the reference capacitor 2 is equal to the capacity of "dry", i.e., not immersed in fuel sensor 1, it is equal and the currents on the module, and therefore, the total current on the line is equal to zero. This compensated for the initial capacity of the sensor 1. Since the parameters of the diodes 3 are close to each other, with equal currents voltage drops on them differ very little due to the smallness of the differential resistance of the diode. This ensures high stability of the zero tolevamer. Also due to the coincidence or proximity parameters of their temperature diodes care almost the same, i.e., the temperature stability of the zero tolevamer also high.When filling sensor 1 fuel increases the capacity by increasing the liquid column level. This leads to an increase in the current and, consequently, to increase the output voltage of tolevamer Uoat the output of the DC amplifier e and density p. This leads to the change of the indication level. To compensate for these changes in the measurement of the mass of fuel should be adjusted according to the temperature so as to compensate for temperature changes of level. As the temperature is increased the values of e, p (and the fuel index 1) decrease, the decrease in the current through the capacitance of the sensor due to 1 should be offset by the corresponding increase of the current by reducing the voltage drop Udin particular diode in a particular half-cycle voltage of the alternator. A corresponding increase in current is achieved by selecting the value of the voltage Uggenerator 4 by an adjustable amplifier 6. ELECTROELASTIC TOLEVAMER containing the generator AC voltage, a DC amplifier, chetyre diode sensor and the reference capacitor, the first plates of which are connected, characterized in that it introduced an adjustable amplifier connected between the generator voltage and the connection point between the plates of the sensor and the reference capacitor, and the anode and first cathode of the second diode is connected to the second plate of the sensor, the anode of the third and the cathode of the fourth diode with and grounded, and the fourth anode and the cathode of the first diode is connected to the input of the DC amplifier.
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