Liquid level meter

FIELD: measuring technique.

SUBSTANCE: liquid level meter comprises cylindrical housing (2) whose inner space is in communication with the liquid through passages (5). Float (10) mounted in housing (2) is coated with a mirror layer. Emitter (11) and receiver (12) of radiation are connected with the space of cylindrical housing (2) through optical switch (13) made of a disk provided with ports. The surface of the disk is coated with a reflecting layer. The optical switch has corner reflector. Unit (15) is connected with the emitter (11) and receiver (12) of radiation and drive (14) for rotating the optical switch. The liquid level meter is additionally provided with step cylindrical nozzle (6) having base (7) for fastening to the neck of the reservoir, second corner reflector, and glass baffle (8) that separates hollow cylindrical nozzle (6) into stages. The small diameter stage receives tube (1) provided with housing (2) of the liquid level meter. The ring space between the tube and the housing is closed by baffle (3) with reflecting layer (4) on its inner side to prevent a contact with the liquid. The large diameter stage of cylindrical nozzle (6) receives optical switch (13) one port of which receives the first and second corner reflectors. Emitter (11) and receiver (12) of radiation and drive (14) of optical switch (13) are mounted on base (7) of the step cylindrical nozzle (6).

EFFECT: enhanced precision.

3 dwg

 

The invention relates to the measuring of liquid level for the hard of vertical tanks, in particular to the level of the liquid with the use of floats, and can be used in petroleum and chemical industry mainly for monitoring the level of liquids stored in any vertical tanks with horizontal bottoms.

As practice has shown the operation of the vertical rigid tanks, on the measurement of the liquid level is influenced by uncontrolled change the base height of the tank by changing the position of the bottom relative to the roof of the container during dispensing operations and periodic deformations of hydrostatic pressure, as well as most of the level when measuring level is tied to the base height of the tank, then the reliability of the measurement of liquid level is very low due to change (deflection) of a horizontal bottom.

The authors goal was to develop a sensor that would reduce measurement error by taking into account the influence of the hydrostatic pressure of the liquid at the bottom.

When viewing the patent and scientific and technical information have been identified technical solutions-analogues. So, it is known device for measuring liquid levels in tanks containing the receiver hydrostatic pressure in the form of a piston, over the which installed emitting and receiving optical fibers, optically coupled respectively to a source and a light receiver, electrically connected to the power supply, the two inputs of analog-to-digital Converter and indicator (patent RF №2064665, G01F 23/14 1996).

The disadvantages of this design are low precision due to the instrumental error of the pair of friction of the piston-pipe, temperature instability of the components of the electric circuit, the resinification and contamination of the optical surfaces, as well as a small dynamic range measurements due to the large scattering of optical radiation outside the focus of the spherical cavities.

The closest in technical essence to the invention adopted for the prototype is a device for measuring the level of liquid in airtight containers, containing a cylindrical hollow body with an installed inside can move in the vertical plane of the piston, the surface of which is placed corner reflector. In the upper part of the body has transmitting and receiving optical fibers connected through input and output of radiation and optical contact, made in the form of a disk with Windows, the outer surface of which is covered with a reflective layer, a source and a radiation detector, electrically connected to the input standby multivibrator, speed meter and EV is (RF patent No. 2084837, G01F 23/22 - prototype).

The disadvantages of this device is the low accuracy due to the influence of the measurement error level of uncontrolled change the base height of the tank by changing the position of the bottom relative to the roof of the container during dispensing operations and periodic deformations of hydrostatic pressure.

The technical result of the invention is to improve the accuracy of measurement of liquid level.

This technical result is achieved by the fact that the known liquid level gauge in a rigid vertical tanks containing a cylindrical housing, an internal cavity through which is made in the bottom of the channels communicated with the measured liquid is placed with the possibility of vertical movement in the cylindrical housing of the float, the upper surface of which is covered with a reflecting layer, a source and a radiation receiver, associated with the internal cylindrical cavity of the housing through an optical contact, made in the form of a disk with Windows on the external surface of which is coated with a reflective layer, a corner reflector and a control unit sequence of operations is electrically connected with the source and the radiation detector and the rotation drive optical contact, according to the invention further comprises a step of p is small cylindrical nozzle, having a support base for sealing the neck of a rigid vertical tank, a second corner reflector and the glass partition separating stage hollow cylindrical nozzle, the step of smaller diameter which is fixed with the possibility of a limited vertical movement of the pipe is coaxially mounted inside the cylindrical housing of the transmitter, an annular gap between them at the lower ends is sealed from contact with the measured liquid horizontal wall with a reflective layer on the inner surface, and the step of larger diameter hollow cylindrical nozzle is placed in optical contact, in one of the Windows which has opposite first and second corner reflectors, the source and the radiation receiver and the optical drive contactor is installed on the supporting base of a stepped hollow cylindrical nozzle.

Figure 1 shows the liquid level gauge (in the context of the tank);

figure 2 - optical contact (top view);

figure 3 - optical contact (a view along arrow I-I of figure 2).

Liquid level gauge includes a vertical pipe 1, covering coaxially mounted therein a cylindrical housing 2 with the annular gap (from two to five centimeters). The annular gap is sealed from contact with the measured liquid is part of the horizontal partition 3, covered mirror (reflecting) layer 4 on the inner side and placed over the channels 5, indicating the internal cavity of the cylindrical body 2 with the measured liquid in the tank. In the upper part of the sensor is placed a stepped hollow nozzle 6, in the step of smaller diameter which is fixed with the possibility of a limited vertical movement of the pipe 1. Manual nozzle 6 has a supporting base 7, which is tightly fixed on the sky-light vertical container with a screw connection. Stage nozzles 6 are separated hermetically installed glass partition 8, which protects the internal cavity of larger diameter from the influence of sediments and vapors of the liquid on the work of the instrumentation.

Limit vertical movement of the pipe 1 (together with the body 2) is achieved due to the presence of the stop 9 (tongue and groove), which provides a range of movement of the pipe 1 in a sliding nozzle 6. Based on the operational practices of vertical tanks the maximum deflection of the plate can reach up to 40 cm in either direction, therefore, the range of movement of the pipe in the stage of smaller diameter is 80 cm

In the cylindrical housing 2 is placed a float 10, the upper surface of which is covered with a reflecting layer. On the supporting base 7 to establish the s source 11 and receiver 12 radiation (photodiodes). Between the supporting base 7 and a glass partition 8 installed optical contact 13, the axis of rotation (OOP) which is connected to the actuator 14 drives (stepper motor). The source 11 and receiver 12 of the radiation, and the actuator 14 of the optical rotation of the contactor 13 is connected to the block 15 controls the sequence of operations of the dimension.

Optical contact 13 has the form of a disk from any durable material (metal, plastic etc) with a diameter of from five to ten centimeters. The axis of the disk is rigidly connected to the drive shaft 14 rotation in the horizontal plane. The slider 13 has three equal sections: "A", "b" and "C" with an angle of 120° each.

Sector "A" and all of its external surface (facing toward the actuator 14 of rotation) is covered with a reflective layer.

Sector "In" on its centerline has a through hole 16 in the form of a rectangle, in which are located opposite the first 17 and second 18 corner reflectors. Corner reflectors 17 and 18 are located in a through hole 16 so as to shift the luminous flux from a source 11 of the radiation in the annular gap between the pipe 1 and the cylindrical body 2 and to the receiver 12 radiation.

Sector "C" on its centerline has a through hole 19 in the form of a circle. The diameter and location on the centerline choose from a condition of securing the passage of the light flux from the source of the ICA 11 to the receiver 12 radiation.

Unit 15 controls the sequence of operations performed in the form of a microcontroller with software (DS1040 Dallas Semiconductor, CJSC DODEKA", Reference materials electronic components, 2003, p.67).

Liquid level gauge works as follows.

To explain the work entered legend:

sector "A" conditionally (for explanation of the operation of the transmitter) is called a sector of the calibration mode;

sector "In" conditionally (for explanation of the operation of the transmitter) is called a sector mode measurement reference height of the tank.

sector "With" conditionally (for explanation of the operation of the transmitter) is called a sector mode of measuring the liquid level in the tank.

The inventive liquid level gauge is a device, the dimensions of which depend on a common vertical tanks, the height of which is within IFF=12 m, and the size of the diameter of the light hatch is 200 mm

Based on the size of the diameter of the light hatch larger diameter of the stepped nozzle 6 take D=197 mm

Before measurement of liquid level in the tank in the unit 15 controls the sequence of operations set the following values:

SCP - value of the distance from transmitter 11 and output 12 of the radiation source to the surface of the optical contactor 13,

NIS - value of the distance from transmitter 11 and output 12 and the source of radiation to the reflective layer 4 horizontal partitions 3,

IFF - base tank height.

The sensor is mounted on the tank so that the end of the pipe 1 has touched the bottom of the reservoir, while checking Squareness of pipe 1 towards the bottom of the tank. When filling the tank in the cylindrical housing 2 by the fluid flowing through the channels 5, is pushed out of the float 10, with the position of the float 10 corresponds to the liquid level in the tank. Unit 15 controls the sequence of operations according to the software by means of the actuator 14 rotation rotates the optical contact 13 so that the sector "A" was placed under the transmitter 11 and receiver 12 radiation. Then the unit 15 controls the sequence of operations includes a source 11 of the radiation, which delivers a short light pulse. Luminous flux from a source 11 of the light is reflected from the surface of the sector "And" optical contact 13 and reaches the receiver 12 radiation. The electrical pulse from the receiver 12 radiation enters the unit 15 controls the sequence of operations that generates a digital pulse equal to the distance NC.

In block 15 controls the sequence of operations is a comparison of the setpoint SCP with a value of NC obtained in the measurement.

If the specified value SCP differs from the value of NC, is on this indicates a violation of the perpendicularity of the pipe 1 towards the bottom of the tank. Correction of installation of the pipe 1.

If the specified value SCP corresponds to the value of NK, then the control unit 15 controls the sequence of operations according to the software by means of the actuator 14 rotation rotates the optical contact 13 so that the through hole 16 sector "B" was placed under the source 11 and receiver 12 radiation. Then the unit 15 controls the sequence of operations includes a source 11 of the radiation, which produces a short light pulse. Luminous flux from a source 11 of the radiation falls on the first 17 angular reflector, which is transmitted to the second 18 angular reflector and falls onto the reflecting layer 4, a horizontal partition 3, is reflected from it and the same path in reverse order arrives at the receiver 12 radiation. Going the distance measurement NR. In block 15 controls the sequence of operations is a comparison of the set value NIS and the measured distance values of NB.

If the measured value of NB does not match the specified value NIS, this indicates that there has been a change of horizontal position of the bottom of the tank, the pipe 1 is moved in a sliding nozzle 6 by the value of ΔN, equal to the difference between the measured values of NB and a given value of NIS. The control unit 15 C the airbag warning lamp alarm indicates that further operation is required to conduct pregraduate tank.

When the current operation of the tank (until the final discharge value ΔN will be considered as a constant value when the level changes.

If the measured value of NB corresponds to the specified value NIS, then the control unit 15 controls the sequence of operations according to the software by means of the actuator 14 rotation rotates the optical contact 13 so that the through hole 19 of sector "C" was placed under the source 11 and receiver 12 radiation. Then the unit 15 controls the sequence of operations includes a source 11 of the radiation, which produces a short light pulse. Luminous flux from a source 11 of the radiation passes through the through hole 19 in sector "C", is reflected from the surface of the float 10 and gets to the receiver 12 of the radiation that corresponds to the NP to the distance of the float 10, taking into account the obtained values ΔN.

According to the software unit 15 controls the sequence of operations of the optical contact 13 by means of the actuator 14 rotates at a speed of twenty revolutions per minute, which provides continuous monitoring of liquid level in the tank to reflect changes in the deformation of the bottom of hydrostatic Yes the population.

The liquid level in the tank is calculated in block 15 controls the sequence of operations according to the following formula:

NZ=IFF-NP,

where NZ is the liquid level,

IFF - base tank height,

NP - the distance from the source 11 and radiation to the float 10.

The proposed sensor was tested on the tank brand RVS-3000, the height of which NZ=1226 cm, hence, taking into account the distance to the mirror surface 4 of the wall 3 NIS=1216 see the purpose of the experiment was to test the adequacy of the sensor is compared with a manual means of measuring the level of kerosene TS-1 RVS-3000. The sensor measured the distance from the transmitter 11 and output 12 of the radiation source to the reflecting layer 4, a horizontal partition 3, which coincided with the set and was NB=1216 see the Level of aviation kerosene TS-1, present in the tank, amounted to NZ=889 cm, which corresponds to the calibration table of tank volume 2510,121 m3.

After carrying out processing operations on the reception 380,06 m3kerosene into the tank through an exemplary counter unit 15 controls gave the error signal (NB amounted 1218,7 cm), equal to the difference of distances ΔN=NB-NIS=1218,7-1216=2.7 cm, indicating a deformation of the bottom. In block 15 of the control sensor is lit lamp alarm requiring pregraduate tank.

Measuring the level using the best roulette, received NZH=1025 cm, and calibration table the amount of kerosene was 2892,987 m3.

When comparing data on the volume of fuel passed through the exemplary meter and measured by the sensor, got the difference ΔV=(2892,987-2510,121)-380,06=2,806 m3.

The analysis of the research showed:

- when using the manual measurement of the level of deformation of the tank floor was ΔH=2.7 cm, therefore, unaccounted systematic component of the measurement error will lead to a shortage of kerosene, equal 2,806 m3;

- liquid level gauge, given the influence of the systematic component of the error level measurement (ΔH=2.7 cm), allows you to reliably measure the level of oil in the tank, thereby solving the problem by improving the accuracy of level measurement.

The use of the invention will due to the combination of the components: a cylindrical body 2 with channels 5, and distinguishing features: a vertical pipe 1 with a horizontal partition 3, is covered with a mirror (reflecting) layer 4, forming a sealed cavity for measuring the base of the tank height and aggregate application of structural assemblies: float 10, the source 11 and receiver 12 radiation, optical contact 13 with the Odom 14 rotation, the control unit 15, the first 17 and second 18 corner reflectors placed in a sliding nozzle 6, steps which are separated by a glass partition 8 to protect the instrumentation from the impact of factors such as the resinification, oxidation, etc. and mounted on the support base 7, hermetically install the entire design of the sensor light on the hatch of the tank, to increase the accuracy of measurement of liquid level in the vertical tanks by eliminating the systematic component of the error from the deformation of the bottom of the tank, and quickly make a decision about pregraduate tank.

Liquid level gauge in a rigid vertical tanks containing a cylindrical housing, an internal cavity through which is made in the bottom of the channels communicated with the cavity of the tank, placed with the possibility of vertical movement in the cylindrical housing of the float, the upper surface of which is covered with a reflecting layer, a source and a radiation receiver, associated with the internal cylindrical cavity of the housing through an optical contact, made in the form of a disk with Windows on the external surface of which is coated with a reflective layer, a corner reflector and a control unit sequence of operations is electrically connected with the source and is the receiver of radiation and rotation drive optical contact, characterized in that it further comprises a stepped hollow cylindrical nozzle having a support base for sealing the neck of a rigid vertical tank, a second corner reflector and the glass partition separating stage hollow cylindrical nozzle, the step of smaller diameter which is fixed with the possibility of a limited vertical movement of the pipe is coaxially mounted inside the cylindrical housing of the transmitter, an annular gap between them at the lower ends is sealed from contact with the measured liquid horizontal wall with a reflective layer on the inner surface, and the step of larger diameter hollow cylindrical nozzle is placed in optical contact, in one of the Windows which is installed opposite the first and the second corner reflectors, the source and the radiation receiver and the optical drive contactor is installed on the supporting base of a stepped hollow cylindrical nozzle.



 

Same patents:

FIELD: engineering of devices for measuring and monitoring level of liquid substances.

SUBSTANCE: ultrasound gage-indicator contains body 1 with float element 2 and acoustic duct 3 made of magnetostrictive material with reflecting load 4 on its free end, signaling electro-acoustic transformer 5 with permanent magnet 6, inquiry generator 7, reading and recording amplifiers 8,9, computing block 10, indication block 11 and control bus 12.

EFFECT: increased precision and resolution during operation under highly explosive conditions.

3 dwg

FIELD: the invention refers to measuring technique and is designed for using in technological systems for measuring and control of liquid highly explosive medium in quality of a mobile device.

SUBSTANCE: the level meter has a body 1, a directional tube 2 out of non-magnetic material, a float-level element 3 with a constant magnet 4, a limiter of transferring 5, a working medium 6, U-shaped acoustic line 7, an input and output signal electric acoustic transformers 8,9, a recording generator 10, a reading amplifier 11, a calculation block 12, an indication block 13 and a control bus-bar. At submerging of the body 1 of the level meter into the working medium the position of the float-level element 3 with the constant magnet 4 changes relatively to the U-shaped acoustic line 7. This is reflected on the positions in the time field of information signals excited and read by the input and output electric acoustic transformers 8,9 in the medium of the acoustic line 7, and also on the result of the digital coding level hx fulfilled by the indication block 13 in the shape of light (sound) information.

EFFECT: increases reliability of the measuring level of transformation and explosion safety at the work with liquid medium, increases noise immunity and expands the field of technical usage.

3 dwg

FIELD: the invention refers to measuring and transformational technique and is designed for using in quality of a mobile measuring device for measuring and control of liquid highly explosive medium.

SUBSTANCE: the level meter has a body 1, a directional tube 2 out of non-magnetic material, a magnetostrictive acoustic line 3 with a wave reflector 4 and a stabilizer 5 of tension and twisting placed in a discrete filler 6 with small surface friction, an input and output signal electroacoustic transformers 7,8, a float-level element 9 with a constant magnet 10, a limiter 11 of transferring, a working medium 12, a recording generator 13, a reading amplifier 14, a calculation block 15, an indication block 16 and a control bus-bar 17. The changing of the level of liquid 12 in a working cavity of the bode 1 of the arrangement call transferring of the float-level element 9 with a magnet 10 relatively to the acoustic line 3. This reflects dimension of a time interval of the level formed along the acoustic section of the primary transformer with the aid of the recording generator 13 and the reading amplifier 14 which transforms with the aid of the calculation block 15 into a binary code and is reflected by the indication block 16. The technical result is increasing of reliability of the measuring transformation of the level and expansion of technical application.

EFFECT: increases noise immunity and explosion safety of the measuring transformation of the level.

3 dwg

Level meter // 2289795

FIELD: engineering of devices for measuring level of liquid using ultrasound waves.

SUBSTANCE: level meter contains pressurized tube 1, ultrasound transformer 2 mounted at the end of wave duct 3, float 4 with constant magnet 5, measuring winding 6, generator 7, amplifiers 8, 9, impulse generator 10, key 11, constant voltage stabilizer 12, communication line 14, resistors 13, 15, direct current voltage source 16, solving block 17, transformer 18 and capacitor 19. as communication line coaxial wire may be used in level meter, by means of which powering of elements and transmission of information signals are organized, providing an advantage when using device to create multi-channel systems for controlling levels of liquid products.

EFFECT: simplified construction, increased reliability of device and increased precision of measurements.

2 dwg

Transmitter // 2284480

FIELD: instrumentation engineering.

SUBSTANCE: invention can be used in different branches of industry for measuring liquid level, flow rate of liquid and limiting filling of liquid in to reservoir. Proposed transmitter contains housing made in form of tube and float with magnetic liquid. Hollow rod is installed coaxially inside housing forming sealed space with housing. Said space accommodates measuring winding located on surface of rod and containing one or several sections of turns. Each section of turns is electrically connected with signal receiver and it contains more than one turn. Float installed inside rod has carrier made of material with reservoir buoyancy relative to medium under checking. Moreover, carrier has closed or open space accommodating magnetic liquid.

EFFECT: enlarged operating capabilities of device.

2 cl, 2 dwg

FIELD: instrument engineering.

SUBSTANCE: device can be used for measuring density and level of liquid in closed rooms. Device has float made in form of hollow cylinder which has lower end to be air-tight closed; protecting pipe with holes in top and lower ends; float disposed inside the pipe; strain gauge converter, flexible rope connected with float and strain gauge converter; microcontroller provided with analog-to-digital converter which is connected with output of strain gauge converter. Device also has stepping reversing motor with micrometer screw fastened to shaft of the stepping motor, bracket with guide lath which is mounted in top end of pipe. Micrometer screw is connected with strain gauge converter, which is mounted onto guide lath for vertical movement.

EFFECT: widened functional capabilities.

1 dwg

FIELD: instrument engineering.

SUBSTANCE: device has level measuring float disposed in vertical inside holed pipe, converting member, temperature detector, and measurement unit. Device also has hollow washer provided with bridge which washer is connected with protection pipe, density-measuring float mounted at lower end of level measuring float for vertical movement, and system for displacement of density-measuring float. Level-measuring float is made in form of tube. Converting member is made in form of resistance strain gauge conjugated with level-measuring float. Measurement unit is made in form of control microcontroller. System for displacing level-measuring float is made in form of ferromagnetic disc fastened to density-measuring float and to solenoid connected with output of control microcontroller.

EFFECT: simplified design; improved efficiency of measurement.

1 dwg

Float level meter // 2272258

FIELD: engineering of devices for measuring level of liquid in reservoirs.

SUBSTANCE: level meter includes float made in form of central-symmetric rotation body, having necks on end of longitudinal axis, scale for measuring level, and connected to reservoir body by links. Links are partially wound around necks and held on lower and upper points of reservoir. Also, level meter has third flexible link, one end of which is wound at the center of float, and other end is connected to counterweight, having level coefficient and positioned in guide positioned outside the body of reservoir.

EFFECT: engineering of float level meter for large reservoirs, including those filled with dark liquid.

3 dwg

FIELD: instrument-making industry, possible use for measuring level and density of liquid in closed volumes.

SUBSTANCE: device has perforated pipe, inside which float is positioned, measuring block and temperature indicator. System for moving the float is made in form of stepping reversing electric engine, drum with cable, connected to float, and guiding roller, mounted on tension transformer. Measuring block is made in form of controlling microcontroller, first input of which is connected to output of tension transformer, second output - to output of temperature indicator, and output - to input of reversing step electric engine.

EFFECT: improved precision, reliability and expanded measuring range.

1 dwg

The invention relates to measuring technique and can be used for liquid level measurement in closed volumes

FIELD: control equipment.

SUBSTANCE: liquid level fiber-optic signaling device can be used for signaling on availability or absence of liquid inside area of measurement, which liquid is transparent for IR-radiation. Device has radiation source and receiver, feeding and removing optical fibers and sensitive element. The latter is made in form of rod having round cross-section; the element is made of optical transparent material, for which the following requirement is met: n0<nair.av<n1, where n0, nair.av and n1 are refractivity factor of liquid, air and rod correspondingly. Length L of rod is described by formula. R is radius of spherical segment of light-guide turned in the direction of media to be measured: 1,5dfe<=R<=2dfe, where dfe is diameter of envelope of optical fiber. R/L relation should meet specific conditions.

EFFECT: higher manufacturability of sensitive element's structure.

2 dwg

FIELD: measuring technique; oil industry; chemical industry.

SUBSTANCE: method can be used for checking level of liquid in reservoirs, for example, at petrol stations. At least one measuring bar is placed in container; there are marks applied onto measuring bar. Image of measuring bar is transmitted by means of TV camera fixed to float (water-proof case of camera can be also made in form of float) through TV signal transmission channel to TV image introducing device and digital computing device, where calculation of level of liquid is performed on the base of digital representation of received original image. Float of waterproof case of TV camera made in form of float is capable of free movement in vertical direction when level of liquid changes. Signal received by TV camera does not depend on position (warps) of float as determination of level of liquid is performed on base of image of glowing areas on surface of light guide, which areas are disposed within field of view of camera. To perceive information, camera needs a small highlight, as camera is located close to measuring bar. When using light guides as measuring bars, highlighting is not required. Precision of result of measurement if defined by technological abilities of microscopic roughness application only with specified pitch onto surface of core of light guide and by resolution of chamber.

EFFECT: very high precision.

9 cl

FIELD: engineering of equipment for measuring height of liquid column in vessels filled with specific liquids, for example, sewage water.

SUBSTANCE: device for determining height of liquid column in a vessel includes vessel with pipe, measuring device and air feeding device. Also, one end of pipe is connected to air compressor, while another, open, one is provided with protective mesh and positioned inside the vessel near its bottom. Pipe is provided with locking valve and measuring device, for example, manometer, placed after the locking valve.

EFFECT: simplified construction, facilitated measurement of liquid column height.

1 dwg

FIELD: test engineering; measurement technology.

SUBSTANCE: indicator can be used as detector of presence of fluid in containers, in particular, in high-voltage discharge conduits of different purpose diesel engine. Indicator has housing, radiation source, reflector, radiation receiver and signal processing unit. There is working cavity in central part of the case. Reflector is disposed inside the cavity onto frame with two parallel channels. Radiation source is disposed in one channel and radiation receiver - in the other one. Radiation source and radiation receiver are connected with signal processing unit fastened to top part of plate. Plate is disposed inside case under frame. There hole for feeding fluid at lower part of side wall of working cavity. There is drainage hole in top part side wall of working cavity. Top cap of the cavity is made in form of screw. Frame is connected with case by thread.

EFFECT: simplified design; reduced cost.

2 dwg

FIELD: measuring engineering.

SUBSTANCE: method comprises setting heating and non-heating thermistors of meters for measuring temperature profile, determining current temperature profiles, calculating current profile of heat exchange coefficients of the thermistors from the formula

where P(z,t) is the current power of heating of the thermistor at point z; m, c, and S are the parameters of the meters for measuring temperature profiles (m is the mass per unit length, c is the heat capacity, and S is the area of the outer side); is the current profile of temperature of the heating thermistor; is the current temperature profile of the non-heating thermistor, and calculating the current profile of the spatial gradient of the heat exchange coefficient . The location of extremums zm at the profile is assumed to be the location of the interface.

EFFECT: enhanced accuracy of locating and expanded functional capabilities.

9 dwg

FIELD: measuring engineering.

SUBSTANCE: method comprises locating extremums of the profile of spatial gradient of the heat exchange coefficient of the distributed sensor of a meter for measuring temperature profile, which is provided with a built-in heater, by repeatable heating of the sensor and measuring the current profile of the heat exchange coefficient from the formula

where mc, and S are the parameters of the sensor (m is the mass, c is the heat capacity, and S is the area of the outer side), P(z,ti) and P(z,ti+1) are the values of heating power, and are the profiles of temperature measured by the sensor, and are the profile of temperature derivatives at time ti and ti+1, and calculating the current profile of spatial gradient of the heat exchange coefficient . The location of the interface is assumed to be the location of extremums at this profile. The current profile of the heat exchange coefficient is determined from the formula proposed.

EFFECT: enhanced accuracy of locating and expanded functional capabilities.

1 cl, 6 dwg

The invention relates to the operation of stationary fuel tanks, water or other liquids and can be used in the work connected with the determination of the height of the liquid level

The invention relates to the measurement of liquid level in domestic and industrial tanks and can be used as the primary measuring Converter in the automated systems of control and management

The invention relates to measuring technique and can be used in various industries to determine the boundaries of the environments in which the sensitive element of the transducer has a different emissivity

The invention relates to the field of measuring and control technology and can be used to control the States of emergency in the compartments of surface and submarine vessels

FIELD: measuring engineering.

SUBSTANCE: method comprises locating extremums of the profile of spatial gradient of the heat exchange coefficient of the distributed sensor of a meter for measuring temperature profile, which is provided with a built-in heater, by repeatable heating of the sensor and measuring the current profile of the heat exchange coefficient from the formula

where mc, and S are the parameters of the sensor (m is the mass, c is the heat capacity, and S is the area of the outer side), P(z,ti) and P(z,ti+1) are the values of heating power, and are the profiles of temperature measured by the sensor, and are the profile of temperature derivatives at time ti and ti+1, and calculating the current profile of spatial gradient of the heat exchange coefficient . The location of the interface is assumed to be the location of extremums at this profile. The current profile of the heat exchange coefficient is determined from the formula proposed.

EFFECT: enhanced accuracy of locating and expanded functional capabilities.

1 cl, 6 dwg

Up!