186results about "Specific gravity by measuring pressure differences" patented technology

The invention provides an SF6 digital density meter based on multi-parameter acquisition and automatic temperature compensation and a control method thereof, the SF6 digital density meter is provided with a density meter display, a detection docking port is arranged below the SF6 digital density meter, the digital density meter is internally provided with a multi-parameter acquisition module and a temperature and pressure arrangement module, and the multi-parameter acquisition module and the temperature and pressure arrangement module are connected with the SF6 digital density meter display. The multi-parameter acquisition module and the temperature and pressure arrangement module are electrically connected with the single-chip microcomputer. And a detection docking port of the SF6 digital density meter is directly and completely contacted with SF6 gas. High concentration of physical quantity acquisition components is realized, and the physical quantity acquisition components are directly and fully contacted with the SF6 gas in the gas chamber, so that accurate acquisition of physical quantities such as actual temperature, pressure and micro water of the SF6 gas for temperature compensation is ensured. Meanwhile, practical improvement is carried out on an existing disclosed SF6 density algorithm model, and an algorithm model with better convergence is obtained.

In order to mechanically monitor a gas density of a greenhouse gas in a more climate-friendly and cost-effective manner, the invention provides a density monitoring method for monitoring the gas density of a noxious gas (10), comprising: a) providing a closed reference volume (26) with a partition wall (28) movably disposed between the reference volume (26) and the noxious gas (10) to be monitored, b) providing a reference gas (56) which has a lower global warming potential relative to the noxious gas (10) by at least a factor of two in the reference volume (26) at a reference gas pressure which is higher than the filling pressure of the noxious gas (10), c) compensating, by means of a spring device (32), for a force acting on the separation wall (28) due to the increased reference gas pressure in the reference volume (26), and d) detecting a deflection of the partition wall (28) for monitoring the gas density. A gas density monitor (14), its use in such a method and an electrical system provided therewith are also proposed.

The invention relates to a C4F7N / CO2 / O2 ternary mixed gas temperature and pressure characteristic curve interpolation compensation method, and belongs to the field of insulating gas compensation. Comprising the following steps: measuring a temperature value and a pressure value of ternary mixed gas in equipment to be measured, and further obtaining a pressure value at 20 DEG C corresponding to the measured pressure value under a built-in rated mixing ratio as a first pressure value; according to the actual mixing ratio of the ternary mixed gas in the to-be-measured equipment, the measured pressure value and the measured temperature value, obtaining the pressure value of the ternary mixed gas at the actual mixing ratio of 20 DEG C as a second pressure value; the deviation between the second pressure value and the first pressure value is calculated, and if the deviation is smaller than a threshold value, the first pressure value is output; and otherwise, performing mixing ratio interpolation through gas virtual compensation to obtain a corresponding pressure value after mixing ratio interpolation, and outputting the pressure value. According to the method, through mixing ratio interpolation, the problem that when the actual mixing ratio of the ternary mixed gas is inconsistent with the built-in mixing ratio, the gas density obtained by the density relay has a large error is solved.

The invention belongs to the technical field of gas density meters, and particularly relates to an SF6 gas wireless remote transmission density meter based on the Internet of Things, which comprises a dial plate, a density cavity, a connecting pipe, a gas pipe and a density wireless transmission system, a rotating shaft is fixed to the front side of the first gear, the outer side of the rotating shaft is sleeved with a sleeve, the sleeve is fixedly installed on the inner wall of the dial plate, a volute spiral spring is arranged in the sleeve, and the rotating shaft and the sleeve are connected through the volute spiral spring; the density cavity is connected to the lower portion of the dial plate through the connecting pipe and communicated with the dial plate, the gas pipe is connected to the lower portion of the density cavity and connected with an external SF6 circuit breaker pipeline, a pressure plate is arranged on the inner wall of the density cavity, and the outer side of the pressure plate is sleeved with a sealing ring. And the monitoring precision is poor.

The invention discloses an SF6 gas density measurement and error compensation system based on dynamic segmented calibration, and relates to the technical field of gas pressure and density measurement, the SF6 gas density measurement and error compensation system comprises a gas pressure sampling module used for amplifying weak analog signals output by a pressure sensor and completing analog-to-digital conversion to obtain digital sampling data used for pressure calculation; the gas density calculation module is used for establishing a density solving model based on a preset physical state equation and outputting a gas density calculation value; and the gas density calibration module is used for carrying out segmented calibration on a pressure interval corresponding to a density calculation value by taking a preset reference pressure point as a reference and outputting a calibrated density measurement result. The invention provides a method for carrying out high-precision sampling and amplification on a weak signal, and solving the density based on rapid iteration of a Betti-Bridgman equation; the invention relates to an SF6 gas density high-precision measuring system which is linked with three systems and is dynamically segmented and asymmetrically calibrated by taking 0.5 MPa as a benchmark.

The present application relates to the technical field of microbial fermentation, and particularly relates to a universal fermentation device, a yogurt production system and a method for producing a yogurt with reduced uric acid. The universal fermentation device comprises a fermentation tank, a sampling tube, a test tube, a sliding member, a pressure detection module and a processor. The pressure detection module is installed on the test tube. The sliding member is slidingly fitted on the test tube, and the sliding member is connected with a first driving rod. The sliding member is provided with a clearance opening, and the clearance opening is matched with a plugging block. The plugging block is connected with a test rod and a second driving rod. One end of the sampling tube is communicated with the fermentation tank, and the other end is communicated with the test tube. The processor is used for determining the density of the fermentation sample and the viscosity of the fermentation sample. The universal fermentation device can realize continuous monitoring of the fermentation system during the fermentation process, effectively avoids sample confusion, improves the timeliness of analysis, ensures that the conditions reflected by the sample are highly consistent with the original fermentation system, and is suitable for various fermentation scenes.

A system for analyzing an agricultural sample in one embodiment includes a stir chamber and a controller. The stir chamber has a housing which defines an internal cavity configured to receive an agricultural sample. A longitudinal axis extends along the internal cavity from a bottom end to a top end. First and second sensors are fluidly coupled to the internal cavity and located at first and second locations with respect to the longitudinal axis. The controller receives a plurality of signals from the first and second sensors and uses at least one of the plurality of signals to compute a density of the sample within a first region of the internal cavity located between the first and second sensors.

The invention discloses a high-precision handheld SF6 gas density detection device which comprises a gas path interface, a detection mechanism and a handheld mechanism, the gas circuit interface is used for accessing an SF6 gas chamber of to-be-tested electrical equipment, and one end of the gas circuit interface is provided with a plurality of adapters of different types; the detection mechanism is used for collecting temperature information and pressure information of the SF6 gas chamber, and the detection mechanism is electrically connected with the handheld mechanism so as to transmit the temperature information and the pressure information of the SF6 gas chamber to the handheld mechanism; the detection mechanism comprises a first temperature sensor and a pressure sensor, and the first temperature sensor and the pressure sensor are electrically connected with the handheld mechanism; the handheld mechanism is used for storing the temperature information and the pressure information collected by the detection mechanism, calculating the corresponding density according to the temperature information and the pressure information, and judging whether the SF6 gas chamber has leakage abnormity or not; and the handheld mechanism comprises a reinforcing shell, a controller, a memory, a timer and a power supply. The invention also provides an SF6 gas density detection method.

The present invention relates to the technical field of marine hydrological monitoring, and in particular to an underwater profile density measurement system and method. The system comprises a survey vessel, a vessel anchor, a steel wire rope, rope guide devices, a parameter measurement device, a measurement and control transmission cable, and a data analysis system. The method comprises: connecting a vessel anchor to a steel wire rope, and then dropping the vessel anchor to a water bottom for anchoring and fixing; enabling a parameter measurement device to enter water along with a measurement and control transmission cable and to maintain movable connection with the steel wire rope; successively pulling the measurement and control transmission cable according to equally spaced markers to move upwards along the steel wire rope from an anchor point, and collecting two water pressure values at different depths and an attitude angle value measured by the parameter measurement device underwater; storing the collected data in a data analysis system, and on the basis of a built-in algorithm, obtaining the density of water around the parameter measurement device; and when the parameter measurement device moves upwards from the anchor point and leaves the water, performing integral processing on the measured data at all points to obtain the total water depth at the anchor point so as to obtain profile density values from the measurement device at different depths underwater, and drawing and generating a curve.

The invention provides a parallel type gas density relay which is used for monitoring the pressure of gas to be measured, one end of a measuring corrugated pipe is open and communicated with the gas to be measured so that the gas to be measured can flow into a measuring cavity, the measuring corrugated pipe and a compensation corrugated pipe are connected in a staggered mode, pneumatic modules are connected in parallel, and pressure-bearing modules are connected in parallel. The pneumatic module and the pressure-bearing module are connected in parallel, and when the pressure range of monitored to-be-detected gas is large, shells of all compensation corrugated pipes and shells of all second pressure-bearing corrugated pipes share pressure together, so that all the compensation corrugated pipes and all the second pressure-bearing corrugated pipes deform within the effective stroke; when the compensation air pressure is large, the shells of all the measuring corrugated pipes and all the first pressure-bearing corrugated pipes share pressure together, so that all the measuring corrugated pipes and all the first pressure-bearing corrugated pipes deform within the effective stroke, the measuring range of the parallel type gas density relay can be expanded, and the requirement for measuring the gas pressure in a larger range is met.

The invention relates to an SF6 gas density monitoring method and system. The system comprises a plurality of SF6 density relays, an edge gateway and a cloud platform. The SF6 density relays are installed at inflation ports of gas chambers of GIS equipment, each SF6 density relay is internally provided with an antenna, a main control circuit board, a temperature and pressure integrated sensor, a power source, a base and the like, SF6 gas temperature and pressure data are collected in real time, density values and standard temperature compensation pressure values are calculated through a state equation, and the density values and the standard temperature compensation pressure values are transmitted to the edge calculation gateway through LoRa wireless communication. And the edge computing gateway identifies the serial number of the relay of which the temperature value exceeds the station index, judges that the relay is interfered by the heating device, triggers a dynamic correction algorithm to send a corrected temperature indication value to the SF6 density relay, and uploads the corrected temperature indication value to the cloud platform to synchronously update data. According to the system, through combination of hardware distributed layout and edge gateway correction, the problem of temperature indication errors in a heating environment is solved, the risk of misjudgment of an SF6 relay is eliminated, and remote monitoring and alarm are realized.

The invention discloses a straw pre-wetting time judgment method and system, particularly relates to the technical field of agricultural waste treatment intelligent control, and is used for solving the problem of multi-target conflict between existing pre-wetting process parameters and tunnel fermentation energy consumption. The method comprises the following steps: acquiring initial moisture content and bulk density distribution data of straw in real time, identifying spatial distribution of a high-density blocking region and a low-density permeation channel in a stacking layer, and generating an effective length reflecting a moisture permeation path; generating a pre-wetting time reference value based on dynamic weight fusion of the current batch and historical pre-wetting data, and performing collaborative correction in combination with a coupling relationship between equipment idling time and ventilation energy consumption; the pre-wetting time threshold value is dynamically adjusted through a cooperative feedback mechanism of the main fiber direction of the straw stalks and the acoustic impedance characteristics of the stacking layers; finally, a termination instruction is triggered according to the continuous stable state of the surface layer moisture content and the fiber orientation, and precise balance between energy consumption and process efficiency is achieved while the pre-wetting uniformity is improved.

The invention discloses an SF6 density relay verification device and a verification method thereof, which realize automatic debugging and calibration in the production process of an SF6 density relay through the combination of manual and automatic pressurization and pressure relief, save time and labor, and improve the accuracy and convenience of adjustment and calibration of the SF6 density relay. The SF6 density relay verification device comprises a box body, the front end face of the box body is provided with an operation panel, the operation panel is provided with a touch display screen, and the right side of the touch display screen is provided with a pressurization button, a pressure release button, a rotary coding switch, a contact state indicating lamp and a power switch. A circuit board, a pressure sensor, a proportional valve, a switching power supply and a temperature transmitter are installed in the box body, and a power socket, a signal aviation plug, a temperature aviation plug, a gas source inlet fast plug, a test port fast plug and an exhaust port fast plug are arranged on the rear end face of the box body.

A fluid flows through a flowmeter system including a first conduit, a U-bend, and a second conduit. Various differential pressures of the fluid flowing through the flowmeter system are measured. The differential pressures of the fluid are measured by various pressure sensors (for example, differential pressure sensors) installed on the flowmeter system. Rheology of the fluid is characterized by performing calculations using the measured differential pressures of the fluid and relative positions of the pressure sensors throughout the flowmeter system.

The utility model relates to the technical field of petroleum drilling and production, in particular to drilling fluid on-line monitoring equipment which comprises a surge tank, a manual three-way ball valve, an anti-explosion pneumatic ball valve, an anti-explosion pressure transmitter, an overflow chamber, a drain pipe and an anti-explosion temperature transmitter. Fluid is pumped by a pump and guided into a surge tank, temperature measurement is carried out through an anti-explosion temperature transmitter, real-time temperature data are output, high-temperature alarm is carried out through linkage with an anti-explosion pneumatic ball valve, flow adjustment is carried out on the fluid through a manual three-way ball valve, and the fluid continuously flows upwards to an overflow port through the anti-explosion pneumatic ball valve and then overflows into an overflow chamber. And during measurement, the explosion-proof pneumatic ball valve is closed, the fluid in a measurement area is static, the output pressure is measured through the explosion-proof pressure transmitter, the density of the output fluid is calculated by adopting a formula, and the equipment can detect the fluid in real time and give a high-temperature alarm, is rapid in detection and high in efficiency, and is suitable for large-scale popularization and application. The device is suitable for various complex working conditions and fluids.

The invention relates to the technical field of slurry specific gravity detection devices, and discloses a suspension type full-working-condition electronic slurry specific gravity detection device and a detection method thereof.The detection device comprises a barrel, a detection rod and a signal line, pressure sensors are arranged at openings in the two ends of the interior of the barrel, and a mounting plate is arranged at the middle end of the interior of the barrel; protective covers are arranged on the end faces of the two ends of the barrel, and a copper wire lifting rope is arranged above the protective cover located at the upper end of the barrel; the detection method comprises the step of directly putting the cylinder body into a mud pit for detection. According to the suspension type full-working-condition electronic mud specific gravity detection device, through the arrangement of the measuring rod and the copper wire lifting rope, the device body can be overhung out and slowly put into mud liquid, and operation close to the side of a mud pool is not needed; according to the detection method of the suspension type all-condition electronic mud specific gravity detection device, the cylinder is placed in a mud pit, the upper pressure sensor and the lower pressure sensor measure pressure, the specific gravity of mud is calculated, operation is easy, and time and labor are saved.

The invention relates to the technical field of chemical equipment, in particular to a special online density precision detector for a full-automatic chlorination process. The device comprises an instrument desk assembly installed on a reaction kettle, a compressed air inlet pipe used for air inlet is connected to the side of the instrument desk assembly, an air inlet main valve and a pressure reducing valve are arranged on the compressed air inlet pipe, a rotor flow meter is arranged in the instrument desk assembly, the bottom end of the instrument desk assembly is connected with an H air blowing pipe and an L air blowing pipe, and the two air blowing pipes are both connected into the reaction kettle. The bottom end of the L-shaped air blowing pipe is higher than the bottom end of the H-shaped air blowing pipe, a pressure difference transmitter is arranged on the top of the instrument desk assembly, and the L-shaped air blowing pipe and the H-shaped air blowing pipe are sleeved with sampling pipes. Through the arrangement of the sampling pipe, it is ensured that the measurement environment is stable, and the measurement precision is ensured; the direct contact between an instrument and reaction liquid is directly avoided, indirect measurement is carried out by adopting pressure difference, the service life of equipment is greatly prolonged, and the device is suitable for production of various highly corrosive materials.

The present application relates to a kind of SF6 gas density monitoring method and system, including multiple SF6 density relay, edge gateway and cloud platform.SF6 density relay is installed in the gas inlet of GIS equipment each gas chamber, its built-in antenna, main control circuit board, temperature pressure integrated sensor, power supply and base plate etc., real-time acquisition SF6 gas temperature and pressure data, calculate density value and standard temperature compensation pressure value by state equation, through LoRa wireless communication transmission to edge computing gateway;Edge computing gateway identifies the relay number of the temperature value exceeding the site index, determines that it is disturbed by heating device, triggers dynamic correction algorithm to send corrected temperature indication value to SF6 density relay, and upload cloud platform synchronously updates data.The system is combined by hardware distributed layout and edge gateway correction, solves the temperature indication error problem under heating environment, eliminates the risk of SF6 relay misjudgment, realizes remote monitoring and alarm.

Embodiments herein relate to systems and methods for varnish detection and / or monitoring in hydrocarbon fluids. In various embodiments, a system for monitoring varnish compounds in fluids is included herein including a control circuit in communication with a fluid property sensor. The system can measure one or more fluid properties (such as dielectric constant, density, resistivity, viscosity and the like) with the fluid property sensor, monitor the same over a time period, and identify an occurrence of a rate of change in the measured property indicating a presence of the varnish compounds. In various embodiments, a system herein can be configured to measure a fluid property of a fluid with a fluid property sensor, monitor the fluid property value over a time period, and predict a time of the onset of varnish compound formation based on the trend of the fluid property value over time. Other embodiments are also included herein.

The invention relates to a real-time dynamic monitoring device for the specific gravity of cement slurry. The real-time dynamic monitoring device comprises a cement slurry storage tank, a slurry specific gravity collecting device, an integrated controller, a data wireless transmitting device, a database and application server, slurry specific gravity monitoring machine-mounted end equipment and slurry specific gravity monitoring remote monitoring end equipment, the slurry specific gravity collecting device is installed at a proper position of a cement slurry stirring tank or a cement slurry storage tank, and the slurry specific gravity collecting device, the integrated controller, the data wireless transmitting device, the database and application server and the slurry specific gravity monitoring remote monitoring end equipment are sequentially connected. And the integrated controller is also connected to the slurry specific gravity monitoring machine upper-end equipment. According to the invention, real-time measurement of the specific gravity of the slurry can be realized, measurement information can be remotely sent to a database for subsequent quality evaluation application, pile forming is ensured to meet design requirements, real-time alarm is carried out on substandard conditions, and a statistical chart is formed to serve as a basis for quality management of related departments.

The utility model provides a kind of SF6 gas relay density monitoring device, it is related to SF6 gas density monitoring technical field.The device includes shell, gas flow channel and control unit.Gas flow channel is through shell, and its inner wall is equipped with the mounting pedestal that is protruded to center.Fixed with sensor module on mounting pedestal, the module includes temperature sensor and pressure sensor, and module surface is covered with high heat-conducting silicone grease layer, to improve heat conduction efficiency.The air current direction of sensor module is equipped with spoiler, it is inclined arc sheet, can optimize air current state.Control unit is electrically connected with sensor module, for receiving and processing the signal from temperature sensor and pressure sensor, the device solves the technical problem that SF6 gas relay density monitoring device is insufficient in real-time and accuracy due to temperature compensation, and the real-time of temperature compensation and measurement accuracy are significantly improved.

The utility model discloses an evaporator solution density measuring device and system. The evaporator solution density measuring device comprises a circulation branch, a gas-liquid separation tank, a density measuring tank and a densitometer, wherein an inlet and an outlet of the circulation branch are respectively communicated with an evaporator; the gas-liquid separation tank and the density measurement tank are sequentially arranged on the circulation branch in the flowing direction of the solution; and the densimeter is communicated with the density measuring tank. A circulation branch is arranged outside the evaporator through the gas-liquid separation tank and the density measurement tank, the solution is in a flowing state when flowing through the gas-liquid separation tank and the density measurement tank, the state of the solution is basically consistent with that of the solution in the evaporator, and the phenomena of solution deposition and pipeline blockage are avoided. At the moment, the density of the solution in the density measurement tank is measured through the densimeter, the density value of the solution in the evaporator can be truly reflected, and the measurement accuracy is improved.

The embodiment of the utility model discloses a density relay checking device. The density relay checking device comprises a cylinder, a piston, a transition cavity and a breather pipe, the piston is arranged in the air cylinder and is in sliding connection with the air cylinder, and a closed space defined by the piston and the air cylinder is a variable-pressure cavity; the piston is used for sliding in the air cylinder, so that the volume of the variable-pressure cavity is increased to reduce the gas pressure in the variable-pressure cavity, or the volume of the variable-pressure cavity is reduced to increase the gas pressure in the variable-pressure cavity; one end of the breather pipe is connected with a variable-pressure cavity of the air cylinder, and the other end of the breather pipe is connected with a density relay of equipment to introduce gas in the equipment into the variable-pressure cavity; the transition cavity is arranged in the air cylinder and communicates with the variable-pressure cavity through the air inlet and outlet channel, the air inlet and outlet channel is provided with a switch, and the transition cavity is used for collecting air in the variable-pressure cavity so as to supplement the pressure reduction amount to the variable-pressure cavity and meet the requirement that when the size of air in a pipeline is increased due to the fact that a long breather pipe is used and installed, the pressure reduction amount is increased. The step-down amount reaches a target verification value.

A method for measuring slurry concentration in a tailings thickening device includes the following steps: obtaining the pressure values ​​at each monitoring point, which are equidistantly located at different heights within the tailings thickening device; calculating the slurry density at each monitoring point; calculating the slurry concentration at each monitoring point; constructing a distribution model of the slurry concentration within the tailings thickening device using nonlinear regression based on the slurry concentration and distance from the liquid surface at each monitoring point; and substituting the distance from the liquid surface at the point to be measured into the distribution model to obtain the slurry concentration at the point to be measured. Compared with existing technologies, this invention offers a simple and rapid measurement method that avoids direct contact with the slurry, preventing interference from the slurry to the monitoring instrument and ensuring the reliability of the monitoring data. It is highly operable, requiring only a pressure sensor to complete the monitoring without adding other auxiliary equipment, thus reducing the complexity of the monitoring system. It is also highly timely and can measure the slurry concentration at any height, providing a basis for subsequent fine-tuning of the slurry concentration.

The invention can be used for checking the density of nuclear fuel pellets in an automatic density calculation mode and transmitting the measuring results to a database. The claimed device comprises, arranged in succession, an article loading unit, an article volume measuring unit, an article mass measuring unit, and an article unloading unit. The article loading unit comprises an entry collector and a gate that opens to admit an article into the volume measuring unit. The article volume measuring unit comprises a differential pressure transducer having two cavities, one of which is connected to a measuring chamber into which the article to be checked is loaded, and the other of which is connected to a reference chamber permanently containing a reference article. Each chamber is provided with a valve for opening and closing an entrance to the corresponding cavity of the differential pressure transducer. The article mass measuring unit comprises a weighing device with a platform for receiving articles. The article unloading device comprises a device for expelling an article, and an exit collector into which the weighed articles are released.

The utility model discloses an ammonia desulphurization slurry density and pH value coupling measuring device which comprises a measuring cylinder, a glass fiber reinforced plastic flange installed at the top end of the measuring cylinder, an annular base fixedly communicated with the middle of the top end of the glass fiber reinforced plastic flange, a pH meter electrode installed on the inner wall of the annular base, and a slurry inlet pipe fixedly communicated with the bottom end of the measuring cylinder. The top of the slurry inlet pipe is fixedly communicated with a flushing water inlet pipe, the bottom of the measuring cylinder is provided with a bottom opening, the top of the measuring cylinder is provided with a top opening, the surface of the bottom opening and the surface of the top opening are provided with double-flange differential pressure transmitters, the top of the measuring cylinder is located above the top opening and fixedly communicated with an overflow outlet pipe, and the two sides of the inner wall of the annular base are both provided with containing grooves. According to the coupling measurement device for the density and the pH value of the ammonia desulfurization slurry, the slurry flow velocity is reduced and erosive wear of the slurry to a glass pH meter electrode is buffered by arranging the coupling measurement device into an expanded pipe type and arranging the inner diameter of the overflow outlet pipe for liquid outlet to be larger than the inner diameter of the slurry inlet pipe for liquid inlet.

A system for mixing a liquid with a powder into a solution batch includes a hopper (20) into which said powder is deposited, the hopper (20) having a powder outlet (22) therein. A mix tank (60) is also provided having a liquid supply inlet (62), a recirculation inlet (64), and a solution outlet (66). A mix pump (40) that is in fluid communication with the solution outlet (66), the powder outlet (22), and the recirculation inlet (64) operates to mix and transfer the solution.

The invention relates to a gas densitometer (100, 200) for monitoring the pressure or density of a gas in a gas chamber (1), comprising: a housing (102, 202) having a first housing cavity (103, 203) and a measurement chamber (168, 268); a first coupling (104, 204) via which the measurement chamber can be connected to the gas chamber; at least one reference flap (105, 205), which is in particular directly or indirectly connected to the transmission element (109, 209); and at least one switching and / or monitoring unit (110, 210), which is held or can be operatively connected to the transmission element directly or indirectly. The measuring chamber is connected to the gas chamber in a gas-permeable manner via a first coupling, and the reference bellows forms a reference chamber (111, 211) which is filled with a constant amount of reference gas. A surface section covering the reference chamber is provided or can be implemented as a measuring surface for gas from the measuring chamber at least in some regions inside the first housing chamber or the measuring chamber.

The embodiment of the invention discloses an oil-water mixed fluid measuring instrument and an oil-water mixed fluid measuring method. The oil-water mixed fluid measuring instrument comprises an oil conveying pipeline, a static pressure bypass, a measuring bypass and a pressure measuring assembly. According to the oil-water mixed fluid measuring instrument provided by the embodiment of the invention, oil-water mixed circulation conveyed by the oil conveying pipeline can be sampled at any time, exploitation or production is not influenced in the sampling process, the oil-water ratio of the oil-water mixed circulation can be directly determined through the arrangement of the static pressure bypass and the pressure measuring assembly, and the detection efficiency is high.

The present application relates to the technical field of gas density measuring devices, and provides a self-compensating bellows. By arranging a plurality of compensating elastic parts that fit together with a plurality of corrugated elastic parts of a corrugated outer tube, and the thermal expansion coefficients of the compensating elastic parts and the corrugated elastic parts are inconsistent, when the temperature of the gas in the self-compensating bellows changes, each compensating elastic part undergoes a deformation amount different from that of each corrugated elastic part, so as to overcome the influence of temperature on the deformation of each corrugated elastic part, thereby enabling the self-compensating bellows to achieve temperature self-compensation. The present application provides a self-compensating gas density measuring device, which uses the self-compensating bellows as a measuring mechanism, so that the device does not need to install additional temperature compensation elements such as a compensating gas chamber or a bimetallic strip, thereby simplifying the structure, reducing costs, and solving the technical problems of the complex structure and high cost of the temperature compensation method of the existing gas density measuring equipment.