292results about "Pressure difference measurement between multiple valves" patented technology

The invention discloses an intelligent detection method and device for a cotton water miscellaneous micronaire value based on multi-source information fusion, and relates to the field of cotton quality detection.The method comprises the steps that the weight, the initial air pressure difference, the cotton sample image, the resistance value, the environment temperature and the environment humidity of a to-be-detected cotton sample are obtained; according to the initial air pressure difference and the weight, the compensated air pressure difference is determined through a weight compensation model; according to the cotton sample image, utilizing an image segmentation technology to extract the impurity area percentage and the impurity grain number of the cotton sample to be detected, and determining the impurity content of the cotton sample to be detected; according to the resistance value, the environment temperature and the environment humidity, utilizing a moisture regain prediction model to determine the moisture regain of the cotton sample to be detected; and determining the micronaire value of the cotton sample to be tested by using a Stacking ensemble learning model according to the compensated air pressure difference, impurity content and moisture regain. According to the method, the moisture regain, the impurity rate and the micronaire value of the cotton can be accurately detected in a non-standard detection environment.

Features relating to a cartridge for use with a vaporizer body are provided. The cartridge mates with the vaporizer body in a cartridge receptacle. The cartridge may include a cartridge body defining a reservoir configured to contain vaporizable material; a mouthpiece coupled to a proximal end region of the cartridge body; at least one proximal absorbent pad wedged within an internal volume of the mouthpiece; a mouthpiece seal with sealing ribs; a cannula defining a vaporization chamber extending through the cartridge body; a resistive heating element; a porous wick configured to draw the vaporizable material in the reservoir towards the vaporization chamber; an internal sealing gasket positioned in a distal end region of the cartridge body; a lower support structure positioned in the distal end region of the cartridge body; and at least one distal absorbent pad configured to wedge within a recess located in the lower support structure.

The application discloses a pressure curve combined air separation variable pressure intelligent adsorption blowdown method, system and device, relates to the intelligent blowdown technical field.The pressure curve combined air separation variable pressure intelligent adsorption blowdown method, system and device, comprising the following steps: S1, real-time acquisition operation state data, and pretreatment is carried out to operation state data;S2, operation state data is analyzed to pressure disturbance intensity;S3, through real-time analysis and feature extraction to pressure curve;S4, operation state data is predicted to start-stop risk;S5, comprehensive operation state data, pressure disturbance intensity analysis result and start-stop risk prediction result execute blowdown control instruction.The air compressor and variable pressure adsorption system lack linkage control based on pressure change, blowdown is easy to cause pressure fluctuation and frequent start-stop, which leads to energy consumption increase and equipment wear, and the existing control mode lacks feedforward regulation mechanism.

A device for measuring a pressure differential comprises a tube, at least one pressure sensor and a processor. The tube comprises a closed insertion portion for insertion into a body, the insertion portion having an insertion end and an internal bore in communication with ambient pressure via an opening in the tube. The sensor is located in or on the insertion portion and comprises an internally facing region in communication with the bore and an externally facing region in communication with an exterior of the tube. The processor is configured to provide a stimulus, which may be an electrical stimulus, to the pressure sensor so that when the stimulus is provided, the pressure sensor provides a measurable response wherein the processor correlates the response with the pressure differential between the exterior of the tube and the bore. The measurable response may be indicative of a change in pressure differential between the exterior of the tube and the bore. There may be a plurality of pressure sensors, in which case at least two of the sensors may have different resonant frequencies at the same pressure differential. The insertion portion may comprise at least one aperture sealed by at least one pressure sensor. The pressure sensor may comprise an electromechanical or micro-electromechanical material and may comprises a piezoelectric and / or electrocapacitive sensor. The externally facing region of the pressure sensor may comprise a coating, which may be electrically insulative.

The application provides a high-static-pressure differential pressure gauge convenient to assemble, and belongs to the field of differential pressure gauges, to solve the problem that impurities in the delivered liquid or gas cannot be conveniently filtered and collected, and comprises a gauge body and a connecting pipe, the connecting pipe is installed on the gauge body, a spring is fixedly connected in a rotating disc, the other end of the spring is fixedly connected with a limiting plate, and the limiting plate is fixedly connected with a clamping block. The application is provided with a treatment box; when the connecting pipe is used to deliver liquid or gas, the liquid or gas passes through the treatment box, the residual impurities can be filtered and collected through the internally-installed filter screen, and the adaptability of the gauge body is avoided from being affected by the impurities; when the filter screen needs to be cleaned, the rotating rod can be rotated to drive the first bevel gear to rotate, the first bevel gear can drive the threaded rod to rotate through the second bevel gear, the threaded rod drives the extrusion box to move inward through the moving plate, the extrusion box is separated from the positioning plate, and after being unobstructed, the extrusion box can be taken out for subsequent cleaning and use.

The invention provides a heat exchanger on-line switching system in an acid making process, which relates to the technical field of sulfuric acid preparation and comprises two sets of plate heat exchangers, two sets of differential pressure trigger components, a three-way valve, a valve core component, two sets of check valves and two sets of cooling components, the differential pressure trigger assembly comprises a power connection part and two deflection parts which are located on the outlet sides of the heat exchangers and deflect reversely under pressure, two outlets of the three-way valve are connected with the inlet sides of the two heat exchangers respectively, the valve element assembly comprises a horizontally-moving valve rod and a motor provided with a power receiving part, the valve rod is provided with a locking part, an inlet of the check valve is connected with an outlet of the three-way valve, and the opening and closing part is in linkage with the motor. When the pressure difference of the inlet and the outlet of a certain heat exchanger exceeds the limit and the driver is powered on to drive the valve rod to the first preset position, the corresponding check valve is fully opened, and when the driver is driven to the third preset position, the check valve is fully closed, and meanwhile the motor is powered off. Automatic, rapid and reliable online switching of the plate heat exchanger is achieved by integrating mechanisms such as differential pressure triggering, mechanical transmission and electric control.

The invention discloses a dual-channel oil-filled pressure core body and a preparation method, and relates to the technical field of pressure core bodies, the dual-channel oil-filled pressure core body comprises a first base assembly, a second base assembly and an integrated circuit board, the first base assembly is provided with a containing cavity and a first groove with opposite openings, and the second base assembly is provided with a second groove; the first groove is communicated with the first oil filling hole to form a first oil filling cavity; the first silicon piezoresistive chip is fixed at the bottom of the first groove, and the first diaphragm seals the opening of the first groove; the second base is provided with a second groove, the second groove is communicated with the second oil filling hole to form a second oil filling cavity, the second silicon piezoresistive chip is fixed at the bottom of the second groove, and the second diaphragm seals an opening of the second groove; the integrated circuit board is in electric signal connection with the first silicon piezoresistive chip and the second silicon piezoresistive chip through the first pin and the second pin. The dual-channel oil-filled pressure core body is simple in structure, high in measurement reliability and capable of meeting the use requirements of different scenes.

The application provides a pressure sensor and an electronic device, wherein the pressure sensor comprises: a differential pressure sensor, a first substrate and a second substrate which are sequentially stacked; a third substrate in the differential pressure sensor is connected with the first substrate through anode bonding to form an absolute pressure sensor; the first substrate has a first through hole penetrating a thickness direction; the second substrate has a second through hole penetrating the thickness direction, and an electronic element is arranged on a side of the second substrate away from the first substrate; and the electronic element is electrically connected with the differential pressure sensor through the second through hole and the first through hole in sequence.

The utility model relates to the technical field of trioxymethylene reactor pressure detection, and discloses a trioxymethylene reactor pressure detection device, which comprises a reactor main body, a pressure detector and a display panel, a pressure controller is arranged on the reactor main body, and a reactor gas phase pipeline is arranged on the reactor main body. According to the trioxymethylene reactor pressure detection device, the pressure detector is arranged on the reactor gas phase pipeline of the reactor main body, the pressure controller is installed on the reactor main body, the pressure detector is arranged on the reactor gas phase pipeline, and the pressure controller is arranged on the reactor gas phase pipeline of the reactor main body. The internal pressure of the reactor gas phase pipeline can be detected through the pressure detector, the internal pressure of the reactor main body can be detected through the pressure controller, and the pressure difference between the two sides of the reactor silk screen layer can be obtained through the pressure controller and displayed on the display panel, so that the working condition of the reactor main body can be conveniently and quickly checked; and the blockage problem can be timely found and processed.

The invention discloses an integrated double-hole friction stress sensor based on pressure gradient detection, and belongs to the field of friction sensors. The sensor adopts flow field surface pressure to detect the magnitude of friction stress, and a friction pressure sensitive module, a pressure detection module and a friction calculation module are integrated in the sensor. When the pressure sensing double-hole structure is subjected to an incoming flow effect, the wall surface has a pressure gradient due to friction resistance, the differential pressure is amplified through the double-hole structure, the differential pressure and the static pressure are detected through the high-precision differential pressure sensitive core body and the high-precision absolute pressure sensitive core body, and then the friction resistance stress is solved. The sensitive core body adopts an integrated packaging scheme, and a double-hole sensitive structure, a pressure cavity, an absolute pressure sensitive core body, a differential pressure sensitive core body and a detection circuit module can be integrally packaged in a single tube shell, so that application under a high static pressure background is realized. The friction resistance stress sensor is excellent in performance, compact in structure, high in robustness and capable of achieving friction resistance stress detection of the hypersonic flight vehicle under the extreme working condition.

Provided is a method for evaluating the air tightness of a case, which can achieve space saving and cost reduction and can shorten the time required for evaluating the air tightness of a plurality of cases. This method for evaluating the airtightness of a housing comprises: a first pressurization / depressurization step in which a first pump connected to a first housing via a first pipe is operated to depressurize or depressurize the inside of the first housing; a first pressure change measurement step for measuring the amount of pressure change in the first housing by means of an evaluation device connected to the first housing via a second pipe after the pressure in the first housing is stabilized; and a first evaluation step for evaluating the airtightness of the first housing by means of an evaluation device on the basis of the amount of change in pressure within the first housing, in which a first valve provided in the first pipe is opened, a second valve provided in the second pipe is closed, a first pressure increasing / decreasing step is performed, the first valve is closed, and a second pressure increasing / decreasing step is performed. A first pressure change measurement step is performed by opening the second valve.

A plunger lift management system may measure a casing pressure data series of an annular space between a casing and a tubing. A plunger lift management system may measure a tubing pressure data series of the tubing. A plunger lift management system may generate a pressure differential data series based on the casing pressure data series and the tubing pressure data series. A plunger lift management system may, based on the pressure differential data series, a weight of a plunger, and a length of the tubing, identifying a weight of liquid lifted by the plunger.

The present application relates to a kind of calibration device and calibration method of shock wave overpressure optical measurement system based on shock tube, it is related to the field of shock wave overpressure test, wherein the calibration device includes: standard shock tube, visible measuring unit;Visible measuring unit includes: transparent quartz tube, first piezoelectric sensor, second piezoelectric sensor, third piezoelectric sensor;Transparent quartz tube one end opening, the other end is closed and is arranged;In the direction from the opening end of transparent quartz tube to closed end, first piezoelectric sensor and second piezoelectric sensor have interval and are embedded in the side wall of transparent quartz tube;Third piezoelectric sensor is embedded in the center of the closed end of transparent quartz tube.This scheme can simply, reliably produce theoretical solvable or accurately measured impact wave overpressure of various shock waves propagation process, can accurately and reliably cross-verify and error determination to the impact wave overpressure obtained in optical measurement process, can accurately calibrate the system error of optical observation wave front propagation process.

The utility model is suitable for the technical field of pressure detection, and provides a packaging structure of a differential pressure sensor, which comprises a sensor body. The protection structure comprises a side shell, a top shell and a detachable shell, and the side shell is provided with a sliding groove; the fixing structure comprises a fixing plate, a connecting plate, a sliding block and a spring, the connecting plate is connected to the fixing plate and the sliding block, the sliding block is arranged in the sliding groove, and the spring is connected to the sliding block and the inner wall of the sliding groove; according to the utility model, a worker pulls the pair of pulling plates, so that the sliding block slides in the sliding groove, the connecting plate and the fixing plate are driven to move towards the direction far away from the sensor body, and at the moment, the spring is stretched; a worker places the disassembly shell between the side shell and the top shell; under the action of the elastic force of the spring, the fixing plate is driven to abut against the dismounting shell; by arranging the fixing plate, the detachable shell can be fixedly connected with the top shell and the side shell, and the situation that the structure is scattered when the detachable shell is subjected to physical impact or vibration of the external environment is avoided.

The invention provides a packaging structure of a differential pressure sensitive element. The packaging structure comprises a packaging base, a pressure conduit and a column array structure, the central axes of the column array structure, the first pipeline of the pressure conduit and the differential pressure sensitive element coincide and are parallel to the central axis of the packaging base; the column array structure comprises a plurality of column units surrounding the periphery of the first pipeline; and the differential pressure sensitive element is fixed on the first pipeline opening of the pressure conduit and the second array surface of the column array structure. By arranging the column array structure, including setting the length, position height and form of the column unit, setting the size relationship among the column array structure, the differential pressure sensitive element and the pressure conduit, isolating the stress of a static pressure load on the differential pressure sensitive element, reducing the influence of high static pressure on the differential pressure sensitive element, and inhibiting the static pressure deviation; and the measurement accuracy and repeatability of the differential pressure sensitive element are improved.

The application discloses a method, device and program product for monitoring the operation state of a dust removal system, comprising: acquiring a first current negative pressure value of an air inlet side of a filtering device in the dust removal system and a second current negative pressure value of an air outlet side; compensating the first current negative pressure value and the second current negative pressure value respectively to obtain a first current compensated negative pressure value and a second current compensated negative pressure value; calibrating the first current compensated negative pressure value and the second current compensated negative pressure value respectively by using a calibration coefficient to obtain a first calibrated negative pressure value and a second calibrated negative pressure value; determining a pressure difference value between the first calibrated negative pressure value and the second calibrated negative pressure value by using the first calibrated negative pressure value and the second calibrated negative pressure value; and determining the operation state of the filtering device in the dust removal system by using the pressure difference value. According to the embodiment of the application, the pressure difference value between the two ends of the filtering device in the dust removal system can be accurately determined, and then the operation state of the filtering device in the dust removal system can be accurately determined.

The invention relates to the technical field of floor slab construction equipment, in particular to ultrahigh reinforced concrete floor slab construction equipment and a construction method thereof. According to the technical scheme, the tension detection device comprises a plurality of stand columns and further comprises a detection rod which is installed between every two adjacent stand columns and used for detecting tension between every two adjacent stand columns, each detection rod comprises pull rods fixedly installed on the two corresponding stand columns, and a tension detection component is fixedly installed between the two pull rods. The tension detection component comprises a hydraulic cylinder fixedly connected with one pull rod, a piston is slidably and hermetically connected in the hydraulic cylinder, a connecting rod is fixedly mounted on the piston and fixedly connected with the other pull rod, and pressure gauges are fixedly mounted at two ends of the hydraulic cylinder. According to the invention, the hydraulic detection rod and the bidirectional pressure gauge are integrated, so that high-sensitivity detection of tension between the adjacent columns and accurate judgment of the settlement direction are realized, and the risk of internal force redistribution caused by wrong adjustment due to misjudgment of the settlement columns is fundamentally avoided.

The present disclosure relates to a sensor device (2) for detecting intracranial pressure, said sensor device (2) comprising a housing (8) defining an interior space (15a; 15b) configured to accommodate a pressure sensing device (9) and an electronic control unit (14) to which said pressure sensing device (9) is connected; and fixation means (7; 2b) cooperating with said housing (8) for mounting said sensor device (2) within a human skull (3), optionally in a permanent manner. Furthermore, said housing (8) has an opening (11) covered by a membrane (12) made of titanium or a similar thin, flexible material, and is configured to generate vibrations in accordance with existing external pressure, said vibrations being transmitted to said pressure sensing device (9). The present invention also relates to a method for detecting intracranial pressure.

The invention relates to a high-stability monocrystalline silicon differential pressure transmitter, and relates to the technical field of differential pressure transmitters, the high-stability monocrystalline silicon differential pressure transmitter comprises a transmitter body, two clamping blocks are symmetrically mounted on two sides of the bottom of the transmitter body, diaphragms are arranged on two sides of the bottom of the transmitter body, and two plugging assemblies and two replacement parts are arranged on the transmitter body; the pressure transmission channel is immediately blocked when a measured medium is subjected to overload pressure impact, secondary damage caused by continuous pressure bearing of the damaged diaphragm is effectively avoided, meanwhile, a brand new diaphragm can be automatically replaced, it is ensured that the new diaphragm is always in the optimal elastic working condition so as to maintain stable measurement precision, and the working efficiency is improved. The old diaphragm damaged by overload is synchronously and automatically moved to the external space, a worker can conveniently take away and maintain the whole transmitter body without disassembling the transmitter body, finally continuous and accurate differential pressure measurement under the non-stop state of equipment is achieved, and the operation reliability and stability of the transmitter body are improved.

The utility model belongs to the technical field of pressure detection equipment, and discloses a differential pressure sensor, which comprises a base body assembly, an overload protection diaphragm assembly, a mounting seat and a pipeline assembly. The base body assembly comprises a positive pressure base body, a middle base body and a negative pressure base body which are arranged in sequence; the overload protection diaphragm assembly comprises a first overload protection diaphragm located between the positive pressure base body and the middle base body and a second overload protection diaphragm located between the middle base body and the negative pressure base body. The mounting seat with the pressure sensing chip is arranged on the base body assembly; pressure guide liquid is arranged in the pipeline assembly, and the pipeline assembly enables the overload protection diaphragm assembly to play a role in protecting the pressure sensing chip. The differential pressure sensor is provided with the first overload protection diaphragm and the second overload protection diaphragm, and when the base body is subjected to instantaneous pressure, the first overload protection diaphragm and the second overload protection diaphragm can deform together to reduce the stress generated at the pressure sensing chip. And the two can generate enough deformation quantity in a short time so as to realize a better protection effect on the pressure sensing chip.

The application provides a blockchain-based fluorine salt recovery state monitoring method and system for fluorine-containing wastewater, relates to the fluorine-containing wastewater recovery data processing technical field, and through accurate collection of fluorine salt concentration correlation data of initial and end states of each stage, uploading of a blockchain node to complete tamper-proof storage of original data, and ensuring data traceability and integrity. Subsequently, for physical interference such as micro-bubbles and flocs in sampling of high-concentration fluorine-containing wastewater, corresponding abnormal data is removed through deviation correction, and then combined with offline calibration data to compensate for system errors caused by electrode drift and environmental fluctuations, so that accurate optimization data conforming to actual working conditions are finally obtained. Based on the optimization data, the fluorine salt recovery state of each stage can be determined in real time, and fast feedback is realized to the process control system to achieve accurate regulation and control. At the same time, the recovery state results are stored again, which not only solves the core problems of data distortion and difficult removal of interference in traditional monitoring, but also adapts to the stable detection needs of the alkaline stripping agent system.

The dual differential pressure transducer assembly includes a flow path element that defines a fluid channel from an intravenous (IV) fluid inlet to an IV fluid outlet and defines a centerline axis of the assembly. A first sensor cavity and a second sensor cavity are disposed in parallel alongside the fluid channel and are separately connected to the fluid channel via first and second notches through the flow path element across the centerline axis. A first differential pressure sensor and a second differential pressure sensor abut their respective cavities and are exposed to the fluid channel through the notches. Separate signal conductors are electrically connected to the first differential pressure sensor and the second differential pressure sensor and are housed within a common connector cable.

The application provides a differential pressure transmitter comprehensive compensation method based on Kriging interpolation and cubic spline interpolation, which comprises the following steps: measuring the calibration output voltage of a differential pressure transmitter at multiple temperature calibration points, static pressure calibration points and differential pressure calibration points to obtain data calibration points; fitting a variogram function theoretical model by using Kriging interpolation and obtaining a compensation matrix; establishing an output voltage model by using cubic spline interpolation; when the measured value of the ambient temperature is a temperature calibration point, the measured value of the static pressure is directly brought into the output voltage model to obtain a theoretical voltage, three calibration output voltages adjacent to the theoretical voltage are selected, a differential pressure function relationship is established by using cubic spline interpolation, and the measured output voltage is brought into the differential pressure function relationship to obtain a to-be-measured differential pressure; when the measured value of the ambient temperature is not a temperature calibration point, a compensation coefficient is determined by using the variogram function theoretical model, and the to-be-measured differential pressure is calculated by using the compensation coefficient. The application adopts cubic spline interpolation at the modeling temperature and adopts Kriging interpolation at the non-modeling temperature, so that the algorithm with large calculation amount can be used to improve the compensation precision, the repeated interpolation at each temperature and static pressure interval is avoided, the workload is reduced, and the real-time performance of the compensation is improved.

The invention provides an immersed metal capacitive differential pressure sensor, which comprises a shell which encloses an accommodating cavity; the sensitive element is accommodated in the accommodating cavity, and a gap is formed between the sensitive element and the inner wall surface of the shell; wherein the containing cavity and the gap are both used for containing filling liquid, so that static pressure is uniformly conducted to the sensitive element in all directions through the filling liquid, and then the sensitive element is in a static pressure balance state. According to the invention, the problem that the metal capacitive differential pressure transmitter generates static pressure to influence errors under the high static pressure condition is solved, and the output stability and the measurement reliability of the metal capacitive differential pressure transmitter under the high static pressure condition are improved.

Pressure chambers and associated pressure sensors for mobile communication devices. Mobile communication devices and associated control systems are provided for determining the presence and location of pressure applied to the mobile communication device. The system can replace physical buttons on the mobile communication device. In embodiments, a sealed chamber, such as a tube, is filled with a pressure transmitting medium inside a sidewall of a frame of the mobile communication device. Two (or more) pressure sensors can be mounted to the chamber to measure the pressure at two different locations in the chamber. In one embodiment, the time difference of a pressure wave reaching between the pressure sensors can indicate the location of the applied force. By knowing where the force is applied, the desired command from the user can be inferred.

Disclosed example pressure sensors include: a first body defining a reference pressure cavity; a second body defining a measured pressure cavity and having an inlet configured to receive a fluid; a diaphragm between the reference pressure cavity and the measured pressure cavity, the diaphragm comprising Havar® alloy and having a thickness of 0.010 inches or less; an electrode separated from the diaphragm by a gap to form a capacitance between the electrode and the diaphragm; and measurement circuitry configured to determine a pressure in the measured pressure cavity based on the capacitance.

The application discloses a test device and a test method for testing differential pressure of a seat seal of an expandable packer. The test device is composed of a simulation casing, a multifunctional plug, a liquid inlet hole, a pressure relief hole, a pressure gauge assembly hole, a piston and a spring. The expandable packer is assembled in the test device. Liquid is injected from the liquid inlet hole of the piston into the simulation casing, so that the expandable packer is in a pre-set confining pressure. Then, the expandable packer is pressed, and the differential pressure of the seat seal of the expandable packer in the confining pressure state is tested. The test device and the test method are simple in structure, high in operability, accurate in test result, and can provide an accurate basis for the differential pressure design of the seat seal of the expandable packer.

The utility model discloses an automatic exhaust differential pressure transmitter which comprises a measuring shell, a transmission shell is arranged at the upper end of the measuring shell, a single-chip microcomputer is arranged in the transmission shell, the input end of the single-chip microcomputer is electrically connected to an external power source, elastic elements are arranged at the left end and the right end in a measuring cavity of the measuring shell, and the automatic exhaust differential pressure transmitter further comprises an automatic exhaust mechanism. The automatic exhaust mechanism comprises exhaust pipes, connecting rings and scrapers, the exhaust pipes are arranged at the left end and the right end of the conveying shell respectively, the connecting rings are arranged in the middles of the elastic elements respectively, the scrapers are rotationally connected into the connecting rings through rotating shafts, and the opposite outer side faces of the two elastic elements are attached to the adjacent scrapers. According to the automatic exhaust differential pressure transmitter, bubbles attached to the surface of the elastic element of the differential pressure transmitter are separated through pushing and scraping of the scraping plate, compared with direct exhaust, attachment of the bubbles to the surface of the elastic element of the differential pressure transmitter can be reduced, and the accuracy of the detection result of the differential pressure transmitter is improved.

To provide a sealing structure of a sealed liquid and a pressure sensor which improve pressure resistance reliability at a high temperature.SOLUTION: The semiconductor device includes a device body 2 formed of Si, and a sealing part 4 which has an exposed surface 3 exposed continuously with an outer surface 2a of the device body 2, is formed of Au, Sn, and Si as main components, and is included inside the device body 2. And a sealing hole 5 which is formed inside the device body 2, extends from a sealed end 5a closed by the sealing part 4 to the opposite side of the exposed surface 3, and is filled with sealing liquid 6. The sealing portion 4 is joined to the device main body 2 by diffusion bonding and is integrated with the device main body 2.SELECTED DRAWING: Figure 1

An abrasive jet cutting system may include a differential pressure measurement apparatus configured to measure a differential pressure between points in an abrasive supply system. The differential pressure may be used to determine one or more conditions of the jet and the abrasive delivery. The measured differential pressure may be used in a feedback control system, feed forward control system, and / or an alarm or safety system.