Device to determine phase condition of gas and liquid flow
FIELD: measurement equipment.
SUBSTANCE: substance consists in availability of a measurement device and a thermoresistive sensor of phase condition in a device for determination of phase condition of a gas and liquid flow, and the sensor comprises a printed circuit board arranged along the axis of flow movement and rigidly fixed by one short side with a sensitive element installed on it and made in the form of a substrate, on which a film resistor of the "point" design (a thermistor) is installed. The sensitive element is installed in the reference point along the vertical axis of the pipeline cross section and is connected with the measurement device, which comprises a metering circuit and a microcontroller with program control and is designed to measure variation of thermistor resistance, connected with variation of the phase condition of the medium in horizontal layers of the gas and liquid flow, and signal processing. At the same time the sensitive element of the sensor by one short side of the substrate is fixed on the edge of the short non-fixed side of the printed circuit board. The film resistor (thermistor) placed on the substrate is displaced towards the edge of the free short side of the substrate and is arranged at the distance of not more than 0.5 mm from this edge. Contact sites designed for connection of the substrate to the printed circuit board are arranged opposite to the thermistor at the opposite short side of the substrate.
EFFECT: higher efficiency of a device to determine phase condition of a gas and liquid flow.
The invention relates to measuring technique and can be used to determine the phase state of gas-liquid flow in the control point of the vertical section of the pipeline.
Known devices for determining the phase state of gas-liquid flow (determine the flow regime of the stream, its continuity, depending on the volume of gas content in liquid) (inventor's certificate SU 440585 A1, 25.08.1974; patents: EN 2001391 C1, 15.10.1993; EN 2037811 C1, 19.06.1995; EN 2108567 C1, 10.04.1998; EN 2395801 C2, 27.07.2010; EN 2014568 C1, 15.06.1994; US 6314373 BA, 06.11.2001; US 6655221 BA, 02.12.2003; JP 3455634 B2 9138211 And 27/05/1997; EP 0510774 A2, 28.10.1992; WO 2010071447 A1, 24.06.2010).
A device for determining the flow regime of the gas-liquid flow (patent RU 2390766 C1, G01N 27/22), which measure characteristics of gas-liquid flow in vertical section of the pipeline. The device includes a secondary device and the measuring head inside of plate electrodes connected to the measuring Board, measuring values of the dielectric constant flow. In the presence of air bubbles dielectric constant of the mixture liquid-gas decreases in proportion to the volumetric content of the air in the liquid. Passing through the corresponding layer of the electrodes, this mixture causes a change in capacitance between the plates of the electrodes, elicina which is measured in digital form is transmitted to the secondary device.
Proposed patent RU 2390766 C1 instrumentation has considerable weight and dimensions, as this device is a rather complex structure with a large number of volume elements. The device itself affects the environment settings, its continuity and flow regime, which affects the measurement results and reduces the speed of structure determination of gas-liquid flow.
Known devices closest to the claimed technical solution is a device protected by the patent for the invention "method for determining the phase state of gas-liquid flow and device for its implementation" (EN 2445611 C1, publ. 20.03.2012, IPC G01N 27/00).
In one of the embodiments of the device for determining the phase state of gas-liquid stream contains a measuring device and a sensor with a sensor element located at the cross section of the pipe and connected with the measuring device. The sensor is thermoresistive sensor phase state and contains located along the axis of flow is rigidly fixed to the circuit Board with a hole, on which is installed the sensor element made in the form of a substrate on which is placed a film resistor (thermistor) in the "point" of the performance, while the sensing element is installed the control point on the vertical axis of the pipe cross section. The measuring device comprises a measuring circuit and a microcontroller with software control and is designed to measure changes in resistance of thermistor associated with the phase change medium gas-liquid flow, and signal processing.
In the known device printed circuit Board with a hole, above which is the substrate with thermistor reduces the rate of gas-liquid flow and promotes the formation of vortex flow around the sensor element, which affects the rate of change of the resistance of thermistor sensor phase state and lowers the operating speed of the device.
The specified device according to patent RU 2445611 C1 is taken as a prototype.
The aim of the invention is to improve the performance of your device to determine the phase state of gas-liquid flow.
This objective is achieved in that the device for determining the phase state of gas-liquid flow, comprising a measuring device and thermoresistive sensor phase state, including located along the axis of flow and is rigidly fixed to one short side of the circuit Board installed therein the sensor element made in the form of a substrate on which is placed a film resistor (thermistor) in the "point" of the performance, while the sensing element is installed at a control point on the vertical axis of the pipe cross section and is connected with the measuring device, which contains the measuring circuit and a microcontroller with software control and is designed to measure changes in resistance of thermistor associated with the phase change medium in a horizontal layer of gas-liquid flow, and signal processing, sensor element of one short side of the substrate mounted on the edge of the short loose side of the PCB, film resistor (thermistor), placed on the substrate, shifted to the edge of the free short side of the substrate and located at a distance of not more than 0.5 mm from the edge, with pads that are designed to attach the substrate to a printed circuit Board made in front of thermistor at the opposite short side of the substrate.
In the proposed design, the PCB does not reduce the rate of gas-liquid flow, since it is located above or below the sensing element, which is one short side of the substrate mounted on the edge of the short loose side of the printed circuit Board and installed in the flow, for example, on the Central axis of the pipeline. The substrate with a film resistor (thermistor) instantly enveloped in a liquid or dried gas flow, which increases the operating speed of the device and can detect the presence of gas bubbles in a liquid stream.
From the us the device measurement thermistor sensing element of the sensor phase state is supplied heating current. As a result of heating the temperature of thermistor above the ambient temperature. The temperature rise of thermistor provides increased sensitivity and performance of the device. When shifting film resistor (thermistor), placed on the substrate to the edge of the free short side of the substrate and its location at a distance of not more than 0.5 mm from the edge, reduced heat dissipation on the surface of the substrate, resulting in improved performance of the device at the limit of the heating current.
The offset of thermistor to the free edge of the short side of the substrate is realized due to the fact that the pads are designed to attach the substrate to a printed circuit Board made in front of thermistor at the opposite short side of the substrate.
The invention is illustrated by drawings, diagrams and schedules:
Figure 1 - structural diagram of the device for determining the phase state of gas-liquid flow;
Figure 2 - sensor phase state;
Figure 3 is a topological drawing of the substrate with thermistor;
4 is a sensitive element mounted on the circuit Board;
5 is a waveform change of the signal from the sensor when changing the phase state of gas-liquid flow.
Device for determining the phase state of gas-liquid flow (figure 1)contains the sensor phase state 1 and the measuring device 2. In the measuring device includes:
diagram of measurement (SI) 3, consisting of the elements of a balanced bridge, one leg of which connects the sensing element (thermistor) 11 (numbering SE figure 2) sensor phase state 1;
- managed the DC voltage source (UIPN) 4 for supplying power to thermistor sensing elements 11 of the sensor phase state 1;
- operational amplifier (op-amp) 5, designed to amplify the signal coming from the measuring circuit 3;
- microcontroller with program management 6, connecting the output of the measuring circuit to the analog-to-digital Converter (ADC), digital filtering of the measured signals, the formation of a code sequence of digital signals that determine the state of the sensing element 11, that is, the phase state of the environment in which it is located, the control constant voltage source 4 is supplied to the sensing element;
driver signals interface 7 which enables the reception of signals from the microcontroller 6 and the transmission of signals about the state of the sensing element 11 through the interface, such as RS485, to the information input of the system indication and control 8;
the source of stabilized voltage 9, intended for the formation of the supply voltages for the elements of the s schema.
Posted in the pipeline sensor phase state 1 (figure 2) contains the circuit Board 10, which is located along the axis of motion of gas-liquid flow and is rigidly fixed to one short edge. On the circuit Board 10 is placed sensitive element 11 made in the form of a thin insulating substrate 12 (3) of a width not exceeding 2 mm and a thickness of not more than 100 μm, on which is placed a film resistor (thermistor) 13 made in "point design with dimensions of area not more than 0.04 mm2. The sensing element 11 is set at a control point on the vertical axis of the pipe cross section (for example, on the Central axis of the pipe) (figure 2) and one short side of the substrate 12 is fixed on the edge of the short loose side of the printed circuit Board 10 (figure 4). Film resistor (thermistor) 13 placed on the substrate 12, is shifted to the edge of the free short side of the substrate 12 and located at a distance of not more than 0.5 mm from the edge (figure 3). When this contact pads 14 of the substrate 12 is made in front of a film resistor (thermistor) 13 at the opposite short side of the substrate 12. Topological elements 15 located on the substrate 12, provide precision film resistor 13 and the contact pads 14 of the substrate 12.
PCB pad 10 (figure 4) connect the s by means of soldering to pads 14 of the substrate 12 and connect SE 11, with the help of connecting wires 16, to the measuring device 2 (figure 1, figure 2, figure 3, figure 4). Printed circuit Board 10 with the sensitive element 11 by means of a screw connection 17, a through hole for fastening 18, rigidly attached to one short edge. Wires 16 connect the contact pads of the PCB 10 with the connector pins 20, which is attached to the housing 19, is screwed to the tee 21. Insulating gasket 22 provides a seal between the t-joint 21 and the housing 19 of the sensor 1. A tight seal between the housing 19 and the connector 20 is provided with a sealing gasket 23. The sensing element 11 of the sensor phase state 1 to the measuring circuit 3 is connected to the measuring device 2.
The device for determining the phase state of gas-liquid flow is as follows.
For analysis of fluid flow in the pipe place the sensor phase state with thermoresistive sensitive element 11 made in "the point" design. The sensing element 11 is located in the flow so that the measurements are carried out at a control point on the vertical axis of the pipe cross section, however, depending on the location of the sensor 1, circuit Board 10 is in a gas-liquid flow above or below the sensing element 11 with thermistor 13 With a controlled DC voltage source 4 to thermistor 13 sensitive element 11 serves the supply voltage. Under the action of electric current is self heating, the resistance of thermistor 13 is increased, a thermal balance is established, during which the temperature and the resistance of thermistor 13 is constant. In case of occurrence of gas bubbles or discontinuities in the fluid flow, the volumetric gas content in horizontal layers of flow increases, there is a phase change medium. The heat balance is disturbed, the temperature of thermistor 13, installed in one of the horizontal layers of the stream (for example, on the Central axis of the pipeline), increases due to changes in the conductivity of the medium, which increases its resistance and the voltage change in the diagonal of the balanced bridge circuit dimension 3, i.e. the change in voltage applied to the measuring device 2, which provides a measurement of the voltage and its transmission to the control system. When reducing the volumetric gas content in gas-liquid flow, the temperature of thermistor 13 sensitive element 11 due to heat transfer decreases, resistance decreases and, accordingly, changes the signal in the diagonal balanced bridge measurement scheme 3. The signal from the measuring circuit 3 through the operational amplifier 5 is fed to the microcontroller with program management 6, connecting the output Izmeritel the Noah scheme to the ADC. Is digital filtering of the measured signals and the formation of a code sequence of digital signals that determine the state of the sensing element 11. Formed codogram reflection of the current availability of gas in a liquid flow at a control point on the vertical section of the pipeline. Using the Builder interface signals 7 information signal about the state of the sensing element 11, i.e. on the phase state of the environment in which SE is served on the information input display system and control 8 (e.g., via interface RS48 5). The formation of the supply voltages for the circuit elements is carried out using a source of stabilized voltage 9.
Figure 5 presents the waveform of the signal changes with the detector element when the phase change medium in the pipeline over time. The results obtained in the analysis of gas-liquid flow using the proposed device with thermoresistive sensor containing sensitive element located on the vertical axis of the pipe cross section and mounted in the control point on the Central axis of the pipeline). Time trials amounted to 330 seconds. The graph shows the change in the voltage in the shoulder balanced measuring bridge is Hemi, the corresponding changes in volume content of the gas stream in a time-dependent analysis. The oscilloscope displays the phase transitions of the environment, namely: gas phase transition from the gas phase into the liquid (decrease in voltage corresponds to the supply of liquid flow, liquid, gas bubbles, which correspond to the voltage spikes, the transition from the liquid phase into the gas phase (increase in voltage corresponds to the end of the feed liquid and the gas phase. Fixation sharp peaks lasting less than 1 second (the delay time), confirms the performance of the operation thermoresistive sensor.
Thus, the proposed technical solution, compared with the prototype and other known technical solutions for a similar purpose, achieve goals, namely improving the performance of the device for determining the phase state of gas-liquid flow.
Device for determining the phase state of gas-liquid flow, comprising a measuring device and thermoresistive sensor phase state, including located along the axis of flow and is rigidly fixed to one short side of the circuit Board installed therein the sensor element made in the form of the substrate, where the film p is sister (thermistor) in the "point" of the performance, while the sensing element is installed at a control point on the vertical axis of the pipe cross section and is connected with the measuring device includes a measuring circuit and a microcontroller with software control and is designed to measure changes in resistance of thermistor associated with the phase change medium in a horizontal layer of gas-liquid flow, and signal processing, characterized in that the sensing element of one short side of the substrate mounted on the edge of the short loose side of the PCB, film resistor (thermistor), placed on the substrate, shifted to the edge of the free short side of the substrate and located at a distance of not more than 0.5 mm from the edge while the pads are designed to attach the substrate to a printed circuit Board made in front of thermistor at the opposite short side of the substrate.
SUBSTANCE: method for determining temperature of full polymorphous transformation of heat-resistant two-phase titanium allows of (α+β)-martensitic class is proposed, which involves preliminary preparation of a specimen by means of multistage heat treatment of the latter, which is performed immediately in a differential thermal analysis (DTA) instrument in atmosphere of cleaned argon and its investigation using DTA method. Heating of the alloy specimen to single-phase β-area, supercooling below temperatures of active diffusional decay of β solid solution, short-term exposure and repeated heating to the single-phase area is performed. Fixation of dependence of a DTA signal on temperature and calculation of values of derivative of DTA signal on temperature is performed, and temperature of completion of full polymorphous transformation is determined as per maximum on the curve of the first derivative of DTA signal at repeated high-temperature heatinge.
EFFECT: improving determination accuracy of temperature of full polymorphous transformation in heat-resistant two-phase titanium alloys.
SUBSTANCE: oil sample is heated with one-time temperature control, the sample is continuously cooled with simultaneous measurement of shear stress. Chilling point is determined from temperature corresponding to the first abrupt increase in shear stress, and bulk freezing point is determined from temperature corresponding to the second abrupt increase in shear stress. The sample is heated to temperature of 60-80°C. Heating and temperature control of the sample is carried out while revolving the viscometer cylinder and the sample is cooled at a rate of 1-2°C per minute.
EFFECT: high information value and reliability of the analysis method.
FIELD: test engineering.
SUBSTANCE: body under study is brought into thermal contact with the reference body in the plane in which the local circular heater is located. At regular intervals of time the difference of values of the temperature between the heater and the point of plane of contact of the body under study and reference body is measured. The tests end up in excess of the specified value by the controlled dynamic parameter. The dependence of the current value of thermal activity on the temperature of the body under study is made. The structural transitions in polymeric materials are determined by the presence of peaks on dependence of the current value of the thermal activity on the temperature of the body under study.
EFFECT: improved method.
SUBSTANCE: method of determining volatility and heat of vaporisation of a mixture of liquid substances from the rate of evaporation from a flat surface involves establishing a correlation relationship between volatility values, calculated using known reference data, for individual liquid substances selected as calibration liquids, and the rate of evaporation thereof, determined based on data from thermogravimetric analysis carried out in isothermic conditions when an equilibrium state is achieved. The rate of evaporation of the analysed mixture is determined and the volatility value is found from the correlation relationship. The heat of vaporisation of the mixture of liquid substances in the analysed temperature range is determined using the relationship between the found volatility values and temperature. The value of the heat of vaporisation is determined from the value of the slope of a linear graph, the abscissa of which is the value of the inverse absolute temperature and the ordinate is the logarithm of the product of the experimentally determined volatility value and the absolute temperature value.
EFFECT: high reliability and objectivity of estimating volatility of not only individual liquids, but also mixtures thereof at different temperatures, broader functional capabilities of the method of determining volatility.
2 cl, 6 dwg
SUBSTANCE: method involves separate temperature control of cylindrical samples which make up a eutectic system, one of which has the analysed composition and the other is homogeneous, for example, consists of a pure substance. The samples are brought into contact at analysis temperature which is higher than the eutectic point, and the position of imaging point of the analysed alloy relative the solidus curve is determined from the state of the liquid layer formed between the samples.
EFFECT: invention enables more accurate plotting of a solidus curve on a phase diagram.
3 dwg, 1 tbl, 1 ex
SUBSTANCE: method of determining thermo-oxidative stability of lubricating materials involves heating the lubricating material in the presence of air and mixing. Oxidised lubricating material is then collected. Oxidation process parameters are then photometered and determined using graphical curves. Two samples of the lubricating material of constant weight are tested separately with and without a catalyst. While heating, the two samples of lubricating material of constant weight are tested successively with and without a catalyst, stirred while periodically varying testing temperature from temperature at the onset of oxidation and maximum temperature. Temperature is the lowered from maximum temperature to temperature at the onset of oxidation over a constant period of time. After each testing temperature, with and without a catalyst, the samples are weighed, the weight of the evaporated sample and evaporation number are then determined as a ratio of the weight of the evaporated sample to the weight of the remaining sample. By photometering, the light flux absorption factor with and without catalyst is determined, the thermo-oxidative stability factor is determined as a sum of light flux absorption factor and evaporation number. Further, the influence coefficient of the catalyst KVK on oxidative processes is determined using the formula KVK=KK/K, where KK and K are thermo-oxidative stability factors of samples of the lubricating material with and without catalyst, respectively. A curve of the influence coefficient of the catalyst on the oxidative processes versus the testing time is then plotted, and thermo-oxidative stability of the lubricating materials is then determined from values of the influence coefficent of the catalyst on the curve. If KVK>1, thermo-oxidative stability is falling, and if KVK<1 thermo-oxidative stability is increasing.
EFFECT: high information content of the method of determining thermo-oxidative stability of oxidation and evaporation processes during periodic variation of the testing temperature.
3 dwg, 1 tbl
SUBSTANCE: proposed method consists in measuring activity of acoustic emission signals emitted by tested specimen in heating. Polymorphic transformation temperature is defined as temperature corresponding to the moment of stepwise decrease in aforesaid activity.
EFFECT: higher accuracy and efficiency.
FIELD: instrument making.
SUBSTANCE: device for determining thermal stability of substances consists of cylindrical casing filled with warmth-keeping material, in which there coaxially placed is temperature-controlled metal cylinder with cavities made along its perimetre for arrangement of tightened reaction shells each of which is connected to pressure measurement and recording system. At that, each reaction shell is equipped with flame arrester and pneumatic drive connecting the reaction shell volume to pneumatic protector and precision temperature-compensated bipolar "pressure-voltage" converter which in its turn through multi-channel analogue-to-digital converter one of the inputs of which is connected to output of "atmospheric pressure-voltage" converter, is connected to pressure display and recording system. At that, in each pneumatic drive the provision is made for the tap which is equipped with valve connected to vacuum pump with automatic valve at the inlet, inert gas source and in-series connected pneumatic resistance and valve.
EFFECT: invention allows shortening the time and measurement period, calibration intervals, improves reliability at reducing overall dimensions and electric power consumption.
2 cl, 1 dwg
FIELD: instrument making.
SUBSTANCE: to investigate heat transfer in process of fluid metals cooling, a heat pipe is used, in which a heater of a heating zone is equipped with a controller and is arranged outside the pipe heating area. The heat pipe cooling area is made with a filling nozzle and a thermocouple arranged in it, and with cooling air. The cooling medium flow controller and the thermocouple for measurement of medium temperature are connected into the system of automatic control of the model operation. The device model is made with the scale M1=2÷5, where M1=la/lM, la - size of as-built heat pipe, lM - model size.
EFFECT: possibility to model cooling process.
SUBSTANCE: proposed vibro viscosimetric transducer reduces instability of amplitude and frequency of probe mechanical vibrations in analysing constant-viscosity fluids. Proposed transducer comprises probe mechanical current position pickup. Besides, it comprises mechanical vibration system rigidly coupled via rod with measuring spherical probe provided with thermocouple thermometre, and arranged on rigid base supporting electric exciter of mechanical oscillations of vibration system. Note here that said base is located inside outer temperature-controlled pickup casing and isolated thereof. Note also that mechanical vibration system is made up of two high-Q-factor vibration circuits rigidly fitted on the base to vibrate thereon, mainly, collinearly and linearly at close or equal resonance frequencies. Note here that exciter is arranged to interact only with vibrator provided with rod with measuring probe. Besides, mechanical vibration system represents a tuning fork with parallel operating and compensating vibrators.
EFFECT: reduced instability of amplitude and frequency of probe mechanical vibrations in analysing constant-viscosity fluids.
6 cl, 6 dwg
FIELD: investigating or analyzing materials.
SUBSTANCE: thermograph comprises differential thermocouple and aluminum thermal unit provided with two symmetrically arranged cylindrical holes for crucible with specimen and standard. The crucibles are made of cylinders with caps provided with copper pipes for hot junctions of Chromel-cupel thermocouples. The wires of the thermocouples are housed in the two-channel ceramic rods. The thermoelectric heating of the unit is provided with the use of temperature-sensitive resistor made of nichrome wire. The unit is mounted in the steel sealed housing with a lid and provided with a device for locking it inside the housing during cooling and heating.
EFFECT: simplified design and enhanced accuracy of measuring.
FIELD: polymorph processes in metals and electro-conducting materials.
SUBSTANCE: method of measuring temperature of polymorph transformation is based upon heating for hardening till temperature providing free sag of rigidly tight sample. The temperature should correspond to α→β polymorph transformation.
EFFECT: improved precision of measurement.
FIELD: measurement technology.
SUBSTANCE: device has trier provided with holder and measuring probe provided with thermocouple placed inside the trier. Thermocouple is used which has time constant less than 1,5 sec. Volume of part of thermocouple submerged into salt melt relates to volume of cup of the trier as (5x10-3-10-2):1. Precise value of temperature can be achieved as well as high degree of reproducibility.
EFFECT: improved precision; prolonged service life of thermocouple.
9 cl, 4 dwg
FIELD: test equipment.
SUBSTANCE: metal probe of vibration viscosimeter is disposed inside metal dish in tested fluid to make it thermally isolated from outer space. Viscosimeter is excited with preset frequency and with preset force. Temperature of the dish is changed monotonously and continuously to follow specified rule at speed to exceed speed of establishing processes of change in temperature of tested liquid inside the dish. Temperature of the probe is measured within whole preset range of changes in temperature of the dish as well as amplitude and/or phase and/or frequency of oscillations of the probe. Density, viscosity, thermal conductivity, heat capacity and thermal diffusivity of tested fluid are measured depending on fluid's temperature from the relation of heat diffusivity of fluid and from the relation of viscosimeter's probe forced oscillations. The main feature of the device realizing the method has to be the metal probe of viscosimeter made in form of copper ball or silver ball disposed in fluid for thermal insulation onto rod made of thermo-insulating material. Measuring converter of probe's temperature is made in form of thermocouple and built inside probe. Second measuring converter of probe's temperature, also made in form of thermocouple, is placed onto bottom of metal dish thermally insulated from environment.
EFFECT: improved efficiency of test.
10 cl, 5 dwg
FIELD: inspection of quality of oil products.
SUBSTANCE: permanent-weight lubricant is subject to heating in thermo-stable glass cup at three temperatures at least, which temperatures exceed that one of beginning of oxidation and then it is subject to mixing by glass mixer at constant speed during 12 hours or less. Samples for photometry are selected in equal time intervals. Factor of absorption of light flux by oxidized oil Ability to evaporation is measured by weighing sample before and after test. Graphical dependences of theses parameters are built relatively temperature of testing. Thermal-oxidative stability of lubricant is determined by critical temperature of service ability, by temperature of beginning of oxidation and by temperature of beginning of oxidation.
EFFECT: improved efficiency of measurement.
FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises heating specimens to be analyzed with a rate of 10 deg/min, using standard initial polymineral clays, selecting temperature intervals 20-200°C, 600-800°C, and 20-100° C from the thermo-analytic curves of the standards, determining the reference values in the intervals, determining mass losses, and choosing maximum values of the mass losses in the intervals for the calculation of the fraction ration of clays.
EFFECT: enhanced accuracy of measurements.
6 dwg, 1 tbl, 6 ex
FIELD: measurement technology.
SUBSTANCE: method involves carrying out experimental temperature measurements of cooling liquid avalanche dissociation on hot surface under static conditions, without liquid flow being arisen.
EFFECT: simplified cooling liquid quality control process; reduced tested substance quantity in samples under test; personnel safety in carrying out tests.
FIELD: measuring technique.
SUBSTANCE: method comprises testing two samples of the lubricant of the same mass, the first sample being tested without catalyzer and the second sample being tested in the presence of catalyzer, determining transparency coefficient by means of photometric measurements, plotting time dependences of the transparency coefficient, and determining oxidation stability of the lubricant from the equation presented.
EFFECT: enhanced precision.
3 dwg, 1 tbl
FIELD: measuring technique.
SUBSTANCE: while warming sample up, average value of square of voltage of thermal electrical; fluctuations is measured at terminals of measuring converter. Maximal value, which corresponds to glass transition temperature, is measured, at which temperature the value of dielectric permeability is found and value of hardness coefficient is calculated. Method can be used for measurement of equilibrium hardness coefficient of polymer chains for polymers in unit.
EFFECT: improved precision of measurement.
1 dwg, 6 tbl
SUBSTANCE: method provides usage of temperature detectors to transform electric signal, and identification of type of phase transition. Electric Signal from temperature detector is corrected for value of electric signal which is generated by phase transition of material. Correcting electric signal is achieved by means of additional probe.
EFFECT: improved precision of measurement.
4 cl, 9 dwg