The gauge of bulk materials
(57) Abstract:The inventive transmitter contains placed in the tank 1 filled with bulk material, vertically mounted hard shell 2 with Windows 3, which set forth the sensitive elements 4 made of a stretchy, breathable material. On the inner side of the shell 2 and in parallel to each sensitive element 4 has a vertical row of contacts 5 with resistors 6. The upper end of the shell 2 is plugged, and the lower end of the installed pipe 7 for supplying compressed air. 1 C. p. F.-ly, 1 Il. The invention relates to techniques for level measurement of bulk materials and can be used as a sensor in automated control systems, especially for dispersed environments, capable of svoeobrazoval, freezing and sticking to the designs.Known discrete transmitter (ed. St. USSR N 1352229, CL G 01 F 23/24, 23/26, 1986), containing the sensitive element in the form of a number of vertically set of discrete contacts and a common contact, a pulse generator, a counter, a decoder, recording device, power supply. Order to expand the scope of the sensing element done is established in the form of a series of capacitors.A disadvantage of the known sensor is unreliable in operation due to the fact that its sensitive element is not protected from the effects of dust materials and to control their level of little use due to exposure to abrasive wear, sensitivity to moisture change.The closest in technical essence to the invention is a measuring device for indicating and monitoring the fill level (GDR patent N 218453, CL G 01 F 23/24, 1985). The sensor contains a sensor element and a series of contacts connected with resistors and placed in the shell.The disadvantage of this device is unreliable in operation due to the fact that sticking and hanging on the elastic membrane of the measured environment, putting pressure causes the contacts, regardless of level.A common disadvantage of the known sensors is that they do not provide reliable information about the level of dispersed environment, is able to form arches, to hang and to adhere to the designs.The aim of the invention are to increase operational reliability.This objective is achieved in that in the known gauge of bulk materials, with the displaced in the shell, according to the invention, the envelope has a window located at the level of contacts and the sensing elements are made of a stretchy, breathable material and is fixed in the Windows shell, the shell with one end plugged and the other is equipped with a pipe for supplying compressed air pulses. The shell is rigid and made of a separate removable element.Supply shell Windows located at the level of contacts, and securing them in a sensitive element of a stretchy, breathable material allows aeration of the medium. Running the shell capped at one end and the other equipped with a nozzle for supplying pulses of compressed air helps to eliminate build-up, hang-up, bridging of particulate material on the structural level, to ensure the breaking of the contacts after they are not putting pressure material, and thereby provides reliable operation and obtaining information about the level of dispersion medium over the entire height.Running the shell of a separate removable element provides technological and functional homogeneity, the application of aggregative method of Assembly and repair the ZEC (unloading), transportation, ease of installation and construction works.The drawing shows a General view of the sensor, which is placed in the tank 1 filled with bulk material, vertically mounted hard shell 2 with Windows 3, which set forth the sensitive elements 4 made of elastic and breathable material.On the inner side of the shell 2 and in parallel to each sensitive element 4 has a vertical row of contacts 5 with resistors 6 electrical system (not shown). The upper end of the shell 2 is plugged, and the lower input end of the installed pipe 7 for supplying pulses of compressed air.The transmitter operates as follows.In the presence of material in the tank 1 to a stretchy, breathable material sensitive elements 4, below level, influences the pressure of the material, resulting closed contacts 5, located on this level. When changing the level of material changes resistance circuit that is provided through resistor 6. Thus the resistance of a circuit can be measured in the form of marks level environment in the tank 1, and the reading displayed on the scoreboard.For disconnection of pulverulent material on these elements into the shell 2 through the pipe 7 pulses of compressed air. 1. The GAUGE of BULK MATERIALS containing sensitive elements and vertically installed a series of contacts connected to the resistor and placed in the shell, wherein the shell is made with Windows located at the level of contacts and the sensing elements are made of a stretchy, breathable material and is fixed in the Windows shell, capped at one end and provided with a pipe for supplying compressed air from the other end.2. The sensor under item 1, characterized in that the shell is made of a separate removable rigid elements.
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.