Abstract: An amount of propellant remaining in an orbiting satellite can be estimated in a more accurate manner than is possible with conventional approached. Pressure and temperature telemetry data received from the satellite can be analyzed using a maximum likelihood estimation approach that reconstructs a predicted tank pressure signal using the temperature data and determines a pressurant volume necessary to make the reconstructed pressure signal match the received pressure signal. Drift of the pressure data received from pressure transducers in the satellite can also be addressed using the current subject matter, as can issues including but not limited to inaccessible propellant due to satellite spin, tank expansion under pressure, and the like. Independent determinations of the amounts of propellant remaining can be made using moment of inertia calculations in situations in which an axis of spin of the satellite is known a priori.

Abstract: A method for operating a vehicle having a fuel system that may include unwanted water is described. The method includes, adjusting an operating parameter in response to a relative amount of high and low readings from a water-in-fuel sensor coupled in the fuel system.

Abstract: A tire condition monitoring method and a monitoring system having a simple configuration and that can process data with a high degree of reliability. The method or system determines at a sensor module whether a measured value from a sensor satisfies a preset condition. If determined that the measured value does not satisfy the preset condition, at least one flag is set in the data packet to be transmitted from the sensor module. If, at the receiver, it is determined that the measured value of the received data does not to satisfy a preset condition, whether a flag is included in the received data is determined. If it is determined that the received data includes a flag, the received data is used, and if it is determined that a flag is not included, the received data is discarded.

Abstract: Meter electronics (20) for processing sensor signals for a multi-phase flow material in a flowmeter (5) is provided according to an embodiment of the invention. The meter electronics (20) includes an interface (201) for receiving first and second sensor signals (210 and 211) for the multi-phase flow material and a processing system (203).

Abstract: The method for detecting rotary speed includes: a step (I) for deeming the difference between input power (P) and loss power (A) to be a first order approximation value (PM1) of the mechanical output of an induction motor, and for obtaining a first approximation value (N1=NS(1?S1)) (NS is the synchronous speed) of the rotary speed from the functional relationship (PM1=?S1) of the output (PM) and slip (S) known for the induction motor; a step (II) for obtaining loss power (B1) based on the value (N1); and a step (III) for deeming a second order approximation value (PM2) of the motor output to be P?(A+B1), and for obtaining a second order approximation value (N2=NS(1?S2)) of the rotary speed from the functional relationship (PM2=?S2) (? is the motor constant) of the output (PM) and slip (S).

Abstract: A system including a flow sensor coupled to a fluid line and operable to determine flow rate data of a fluid flowing through the fluid line and communicate the flow rate data of the fluid to a multi-sense device. The multi-sense device coupled to the fluid line and operable to monitor characteristics of the fluid flowing through a filter element. The multi-sense device including a microcontroller coupled to a first, second, and third sensors. The microcontroller executing instructions for determining a pressure differential across the filter element using the flow rate data from the flow sensor, the first pressure of the fluid from the first sensor, the second pressure of the fluid from the second sensor, and the temperature of the fluid from the temperature sensor.

Abstract: This invention encompasses embodiments for multi-modal integrated simultaneous measurement of various aspects of fluids contained in circulating systems such as automotive reciprocating engines and vehicle transmissions. These circulating systems perform constant internal lubrication, and heat and contaminant removal to protect the internal moving parts from the inherent friction and damage in normal operation. Most commonly this is achieved with fluids based on hydrocarbon and/or related synthetics, which, over time, can lose their protective properties, and vary in their performance or breakdown/decay due to internal and external events. Several components within the lubricant fluid can be measured and can provide insight into the efficacy of the system to perform its designed mission. Described herein is a real-time, simultaneous, integrated, multi-modal sensor system for early warning notification.

Abstract: The multiplexed connection circuit (100) comprises a plurality of channels furnished with p channels (101), in particular configured so as to detect at least one particle, and a plurality of output pathways furnished with n output pathways (102), with p>n, each channel being connected to a lone output pathway (102). The circuit furthermore comprises groups of adjacent channels, each channel (101) of the connection circuit (100) belonging to at least one group of adjacent channels and each group of adjacent channels being defined by an assembly formed by the connections of the channels (101) of the group of adjacent channels to the corresponding output pathways (102), this assembly forming a group of output pathways which is associated with the group of adjacent channels, and each group of adjacent channels is associated with a single group of output pathways, different from that of the other groups of adjacent channels.

Abstract: A cylinder intake air amount calculating apparatus for an internal combustion engine for calculating a cylinder intake air amount which is an amount of fresh air sucked into a cylinder of the engine, is provided. An intake air flow rate, which is a flow rate of fresh air passing through an intake air passage of the engine, is obtained, and an intake pressure and an intake air temperature of the engine are detected. A theoretical cylinder intake air amount is calculated based on the intake pressure, the intake air temperature, and a volume of the cylinder. A volumetric efficiency of the engine is calculated by dividing a preceding calculated value of the cylinder intake air amount by the theoretical cylinder intake air amount. The cylinder intake air amount is calculated using the volumetric efficiency, the intake air flow rate, and the preceding calculated value of the cylinder intake air amount.

Abstract: A method to monitor a status from a secondary location of a plurality of equipment on a drilling site, while simultaneously enabling preventive maintenance is described herein. A user can view at least one cycle, at least one control state, and at least one pressure. The user can also view equipment information, equipment repair history, and other information necessary to ensure that a piece of equipment has minimal down time.

Abstract: A method, apparatus, and computer program product for identifying air data for an aircraft. The lift for the aircraft is identified. The number of surface positions for the aircraft is identified. The angle of attack during flight of the aircraft is identified. A synthetic dynamic pressure is computed from the lift, the number of surface positions, and the angle of attack.

Abstract: (EN) The invention relates to a method for estimating the characteristic parameters of a cryogenic tank (1), in particular geometric parameters, including: a step comprising the measurement of the pressure differential between the upper and lower parts of the tank prior to filling DPmes—before; a step comprising the measurement of the pressure differential between the upper and lower parts of the tank after filling DPmes—after; a step comprising the determination of the mass of liquid delivered (mdelivered) during filling; and a step comprising the calculation of a first geometric parameter (R) of the tank, namely the radius (R) which is calculated from equation (I), wherein g is the Earth's gravitational acceleration and MAVO is a density coefficient that is a function of the density of the liquid and the gas in the tank and optionally in the pressure measuring pipes (11) when the pressure differential is measured by at least one remote pressure sensor connected to the upper and lower parts of the tank via r

Abstract: A viscosity measurement device includes a flexible membrane, an actuation heating element, and a displacement sensor apparatus. The actuation heating element is on and spaced in from an outer periphery of the flexible membrane. The displacement sensor apparatus is coupled to the flexible membrane and measures and outputs a displacement signal representative of a viscosity of a fluid in contact with the flexible membrane.

Abstract: Methods and systems are disclosed for using time domain reflectometry to determine the identity of a fluid in a vessel, and to determine whether the quality of a fluid in a vessel is within acceptable parameters. Methods include identifying a fluid by comparing a derived characteristic of a fluid to a reference characteristic, determining the quality of a fluid by determining if a derived characteristic is within an acceptable quality range, monitoring a fluid for a dynamic change in quality or state, and identifying a fluid by comparing a transition reflection waveform to a reference signature transition. The methods are implemented in systems for identifying a fluid layer in a vessel, such as fuel, free liquid water or ice, detecting misfueling or fuel contamination, and detecting fluid state changes, such as the formation of ice.

Abstract: A method of diagnosing a cooling subsystem of an engine system in response a parameter extracted from dynamic hydraulic pressure sensed in the cooling subsystem, and products and systems using same.

Abstract: This invention provides a diagnostic mechanism of a differential pressure type mass flow controller comprising a diagnostic parameter calculating section that obtains a mass flow rate integrated value by means of an integrating calculation from the lowering pressure value of an inlet side sensor among the inlet side sensor and an outlet side sensor arranged in communication respectively at the inlet side and the outlet side of a differential pressure generating resistive element that generates a differential pressure between the inlet and the outlet by changing a flow rate control valve arranged on the channel where a fluid flows from a flow rate control state to a closed state, and further obtains a diagnostic volume value from the obtained mass flow rate integrated value, and a comparing section that compares the diagnostic volume value obtained at the diagnostic parameter calculating section with a specified volume value.

Abstract: A mass flow controller includes a thermal mass flow sensor in combination with a pressure sensor to provide a mass flow controller that is relatively insensitive to fluctuations in input pressure. The pressure sensor and thermal sensor respectively provide signals to an electronic controller indicating the measured inlet flow rate and the pressure within the dead volume. The electronic controller employs the measured pressure to compensate the measured inlet flow rate and to thereby produce a compensated measure of the outlet flow rate, which may be used to operate a mass flow controller control valve.

Abstract: A method of detecting a decrease in tire air pressure includes calculating tire rotation information obtained from the wheel tires; computing a first determination value showing a difference between the sums of the wheel rotation information of pairs of wheel tires on two diagonal lines and a second determination value showing a difference between the sum of the wheel rotation information of right wheel tires and the sum of the wheel rotation information of left wheel tires; assuming the computed first and second determination values as points on orthogonal coordinates; determining position of tire(s) having a decreased pressure based on the argument of the points on the polar coordinates; and comparing the moving radii of the points on the polar coordinates with a predetermined threshold value to thereby determine a decrease in tire air pressure.

Abstract: A method for detecting blockage of a measuring tube of a Coriolis flow measuring device, which has at least two measuring tubes. For this, the at least two measuring tubes are excited by at least one exciter to execute mechanical oscillations, mechanical oscillations of the measuring tubes are registered by at least one sensor and at least one measurement signal representing the mechanical oscillations is produced. At least one produced measurement signal is analyzed for the occurrence of a deviation of a resonance frequency of one measuring tube relative to a resonance frequency of the at least one other measuring tube. In case such a deviation occurs, blockage of a measuring tube is established.

Abstract: A method is provided for determining the viscosity of thin films which exhibit a viscous behavior at a measurement temperature, notably for polymer resins above their glass transition temperature. A thin layer of material is formed on a substrate, a known geometrical pattern is impressed in the thin layer by molding or etching, the thin layer being in the solid state at the end of the impression step. The initial topography of the impressed pattern is measured over the entire length of the pattern along a determined direction, the film is baked at the measurement temperature Tm for a determined creep time tflu, and the resulting topography of the crept pattern is measured. Mathematical processing of the topography measurements is carried out in order to deduce a value of viscosity at the measurement temperature therefrom. The impressed pattern at the start is aperiodic.

Abstract: Various embodiments include apparatus and methods to monitor flow of single and multiple phase fluids. Sensors of a tool can be dispersed along the tool to collect measurements to be processed using an autocorrelation operation on the collected measurements to provide information relative to the phases of the fluid. Additional apparatus, systems, and methods are disclosed.

Abstract: A system detects deflated tires based on a resonance frequency of tires with a vehicle and a relative comparison value of rotation speeds of the tires. The system includes: a rotation information detection means for detecting rotation information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; a resonance frequency assumption means for assuming a resonance frequency of the tires; and a determination means for detection of deflated tires using a decreased pressure determination index calculated by a relative comparison of the rotation speeds of the tires and the resonance frequency. The determination means is so configured as to reduce the second threshold to be compared with the decreased pressure determination index to a value equal to or higher than 1% and equal to or lower than 90% and to detect deflated tires when the decreased pressure determination index exceeds the reduced threshold.

Abstract: A hydrostatic pressure testing system for hydrostatic pressure testing of pipe or other vessels. A control center may include a computer program that monitors, records, and controls the system during testing. A test fluid assembly may include a fill conduit capable of providing a test fluid to an inlet section of a vessel to be tested in response to a command from the computer program. A pressure-release safety assembly may have a vent conduit in fluid communication between an outlet section of the vessel and a safety valve. The safety valve may be in fluid communication with a bleed tank for storing an outlet flow of test fluid from the vessel. The safety valve is actuated to relieve fluid pressure in the vessel in response to a selective condition. A method of using the system to conduct hydrostatic pressure testing is also described.

Abstract: A method for diagnostics of a high integrity protection system (HIPS) for protection of a pipeline downstream of a wellhead includes: monitoring for initiation of an automatic trip or manual safety shutdown or full shut-off test; determining the process safety time (PST) that elapses between the time at which the upstream pressure reached the trip setpoint and the time at which the upstream pressure reaches the maximum allowable piping pressure (MAPP) of the downstream pipeline; and verifying that the safety critical isolation valves stroked to the fully closed position within ½ PST and that the downstream pressure did not exceed the MAPP. If the verification shows that either of those parameters are not met, then the HIPS signals an alarm to operators, and in the case of a manual safety shutdown or full shut-off test, resets the pressure trip setpoint to a lower level.

Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion to combine an oscillation frequency to each of two flow rate signals obtained by A/D conversion on input signals of the phase difference and/or the vibration frequency proportional to the Coriolis force acting on the at least one flow tube; measuring a frequency of a composite waveform associated with at least one of the vibration detection sensors; transmitting a control signal based on the measured frequency; controlling so that a sum frequency component or a difference frequency component of a composite component of a composite frequency signal is constant; and measuring phases from a sum signal or a difference signal of each of controlled converted composite frequencies, to thereby obtain a phase difference signal component.

Abstract: A method to model a complex system of pipes. The model takes into account the physical processes in a tree-type piping system and provides for an accurate modeling of a real world tree-type piping system. In a preferred embodiment, a computer program is provided for analyzing models of dry pipe systems. The computer program includes a user interface and a computational engine. The user interface allows a model of a dry pipe system to be defined and the computational engine determines a liquid flow time through the model of the dry pipe system. The computational engine provides a verification of the liquid flow time in a model of a referential dry pipe system within 20% of an actual liquid flow time in the referential dry pipe system.

Abstract: Generally described herein are devices, methods and systems related to detecting a leak present in a gastric banding system for the treatment of obesity. For example, a leak detector may include a syringe, a leak sensing unit and a needle, and may measure a pressure decay within a gastric banding system after the needle penetrates the patient's skin and is inserted into an access port connected to the gastric band of the gastric banding system. The pressure decay may be interpreted to determine if a leak is present in the gastric banding system.

Abstract: The present invention is directed to an analysis system intended to be able to perform a unit setting of values over multi-pieces of analysis-associated data easily and systematically every analysis device, and the analysis system is provided with an analysis device and an information processing device, wherein the information processing device includes: a unit series data storage part adapted to store multi-pieces of unit series data composed by specifying units to be respectively used for values of the multi-pieces of analysis-associated data given and received between the analysis device and the information processing device; a selection input receiving part adapted to receive a selection input of any of the multi-pieces of the unit series data stored in the unit series data storage part; and a data output part adapted to output each of the values of the analysis-associated data in the unit specified to the selected unit series data.

Abstract: A method is described in which the wheel pressure in an electronically controlled motor vehicle brake system is determined. The brake system includes inlet valves and outlet valves in the wheel circuits. At least one of the valves allows adjusting the valve current. The basis for this are previously determined calibration values which describe the opening current behavior of the outlet valve. A verification of the wheel pressure is performed during a wheel pressure control operation by briefly opening the outlet valve of one brake circuit. The current prevailing in this case can be taken into account as an indicator for determining the wheel pressure.

Abstract: Described is an apparatus for measuring mass change under high pressure, comprising: a high pressure cell comprising a reference quartz crystal microbalance sensor and a sample quartz crystal microbalance sensor, wherein the sample quartz crystal microbalance sensor is coated with a test sample selected from the group consisting of nanoporous materials and metal-organic frameworks; a pressure sensor operatively connected to the high pressure cell; a thermocouple operatively connected to the high pressure cell, wherein the high pressure cell is maintained at a pre-selected temperature; a gas inlet fluidly connected to the high pressure cell; and a gas outlet fluidly connected to the high pressure cell. Also described are methods of making and using the apparatus.

Abstract: An avionics system and process for detecting pneumatic blockages having an air pressure measurement system including a first sensor positioned in association with the air inlet of an air probe component. The air pressure measurement system having a second sensor positioned in association with the air inlet for detecting air pressure in which the second sensor has a frequency response higher than that of the first sensor. An air data computer is coupled to each of the first and second sensors being configured and operable to calculate a first aircraft movement measurement using detected air pressure from the first sensor and is further operative to determine if the first sensor is faulty or if the air inlet is blocked in dependence upon the frequency content and amplitude of the output from the second sensor.

Abstract: Systems and methods for avoidance and correction of potentially adverse combustion states such as flame holding and flashback are disclosed. According to one embodiment of the disclosure, one or more sensors acquire sensor data from one or more sensors associated with combustion. An operational limit margin (OLM) is calculated using an OLM model and based at least in part on the sensor data. A determination is made as to the presence of a potentially adverse combustion state based at least in part on the OLM and the model. Once determined, corrective action may be taken to avoid an adverse combustion event prior to occurrence of the event.

Abstract: A reduction in excitation amplitudes affecting turbine blade durability in a turbine nozzle assembly having a plurality of vanes and turbine blades, includes: identifying a turbine blade design of the turbine nozzle assembly; performing a modal model analysis of at least one of the turbine blades in the turbine blade design; reducing aerodynamic impact by ensuring that each of the turbine blades is free of aero-excitation from an upstream flow at the vanes in an operating speed range; identifying blade natural frequencies with respect to the nozzle vanes; and modifying a trailing edge of at least one of the vanes to reduce the excitation amplitudes.

Abstract: A method and apparatus for determining the fluidization quality of a fluidized bed reactor is disclosed. The method includes measuring pressure within the fluidized bed reactor to obtain a pressure signal. The pressure signal is then transformed using wavelet decomposition into higher-frequency details and lower-frequency approximations. The dominance of the various features is then calculated based on the energy of each feature in relation to the normalized wavelet energies. The fluidization quality of the fluidized bed reactor is then determined from a comparison over time of the calculated energies.

Abstract: Disclosed are systems and methods for monitoring a multiphase fluid and determining a characteristic of the multiphase fluid. One system includes a flow path containing a fluid, at least one integrated computational element configured to optically interact with the fluid and thereby generate optically interacted light, at least one detector arranged to receive the optically interacted light from the at least one integrated computational element and generate an output signal corresponding to at least one characteristic of a phase of the fluid, and a signal processor communicably coupled to the at least one detector and configured to determine the at least one characteristic of the phase of the fluid.

Abstract: The invention relates to a method to determine the wavelength dependent absorption coefficient of a turbid medium using overlapping illumination-detection areas comprising the steps of a) retrieving a calibration spectrum (CA) from a reference measurement using a reference sample; b) carrying out a measurement on an actual sample for determining the absolute reflection spectrum (Rabs) using a raw spectrum measured on the sample (Smedium) and the calibration spectrum (C?); C) using the absolute reflection spectrum (Rabs) for determining the wavelength dependent absorption coefficient by minimizing the difference between the measured absolute reflection spectrum (Rabs) and a model function (Rabsmodel).

Abstract: A downstream side fluid pressure is a fluid pressure of a fluid stagnation portion within a flow path that is internal to a regulator valve. A pressure ratio that is internal to the regulator valve is calculated from an upstream side fluid pressure, the downstream side fluid pressure, and a saturated vapor pressure for the fluid, calculated from a fluid temperature. A pressure ratio table that establishes relationships between a threshold value and a relative flow coefficient of the regulator valve, where the pressure ratio that is internal to the regulator valve, at the time at which the occurrence of cavitation within the regulator valve begins, is defined as the threshold value, is created and stored in a storing portion. The pressure ratio table is used to evaluate whether or not there is cavitation.

Abstract: An automatic analyzer, capable of obtaining analysis results using reaction liquids with absorbance appropriate for analysis processing, is provided.

Abstract: A system and method for controlling an advancing water front in a reservoir toward a wellbore is provided. The system has a production control unit. The production control unit has a reservoir unit for producing a reservoir model and a production path unit for producing a production path model that determines at least one pressure parameter about the wellbore during a life of the wellbore. The production control unit has a production optimizer unit for producing a well plan that optimizes a function of the wellsite. The production control unit may be for controlling an advancing fluid front in the reservoir with at least one control device, and wherein a production path is constructed based on the well plan.

Abstract: A device and a method for aiding inflation for a vehicle involves obtaining access to vehicle tire pressure and temperature data, and utilizing an under-inflation detection module and an inflation condition testing module, thus making it possible to carry out a test for detecting a possible optimal inflation condition if the following criteria are met:—there is a non-critical under-inflation state for at least one of the vehicle tires;—the tires are not in an overheated state;—and the tire state is unchanged by sunlight. When the test module determines the optimal inflation condition, a signal is outputted. Such a method causes tire inflation to be carried out under favorable conditions actually corresponding to the reference value provided by the manufacturers.

Abstract: A method, device and system are provided for measuring multiple pressures under severe conditions. In one embodiment, a method comprises receiving, by a processor, from a first sensor, a first pressure signal; receiving, by the processor, from a second sensor, a second pressure signal; receiving, by the processor, from a first memory, a first correction coefficient for the first sensor; receiving, by the processor, from a second memory, a second correction coefficient for the second sensor; modifying, by the processor, the first pressure signal using the first correction coefficient to generate a first corrected pressure signal; modifying, by the processor, the second pressure signal using the second correction coefficient to generate a second corrected pressure signal; and outputting, by the processor, the first corrected pressure signal and the second corrected pressure signal.

Abstract: A control method for controlling a wastewater network, said network including actuators suitable for influencing the flow rates of water in the network, with the behavior of the actuator depending on setpoints, the method comprising: a step of selecting a rain type from a list of predetermined rain types, as a function of forecast or measured rain; a step of selecting a set of setpoints from a list of predetermined setpoints, as a function of the selected rain type; and a step of sending the setpoints of the selected set of setpoints to said actuators. The method further comprises a step of obtaining first state information representative of the current state of the network, said set of setpoints being selected from the list of predetermined sets of setpoints as a function of the selected rain type and as a function of the first state information.

Abstract: An RS-485 bus is directly connected to transportation refrigeration unit sensors for transmitting information from the sensors to a remote location and for controlling sensor parameters from the remote location. The GENSET associated with the transportation refrigeration unit also utilizes the RS-485 bus, in which the bus is directly connected to the GENSET sensors for bi-directional communication therewith.

Abstract: The present invention includes systems, methods and apparatus for detecting whether an acceptable mixture of fluid and water has been delivered by a vending machine. Embodiments of the invention utilize one or more second flow meters located downstream of a mix manifold. The additional flow meter allows the controller of the delivery system or vending machine to monitor and compare the volume of water to the volume of the final mix in order to determine whether an appropriate volume of syrup has or has not been mixed in the dispensed beverage.

Abstract: A fluid regulator characterization system can characterize the flow of a fluid regulator that results in response to a received control signal. The fluid regulator characterization system can use the characterization to achieve a linear fluid regulator flow gain over a full operating range (e.g., zero percent travel to one hundred percent travel) for the fluid regulator relative to the received control signal. A linear fluid regulator flow gain can improve process control and reduce process variability.

Abstract: The present invention relates to an automatic seepage meter for measuring groundwater-surface water exchange in a mixed zone of stream. The present invention includes: the chamber installed in streambed sediment; the device for measuring amount of groundwater recharge through a change in water level accompanied by discharging water in the water in case of losing stream; and the device for measuring amount of groundwater discharge through a change in water level according to an increased water from the chamber to the water bath for measuring discharge in case of gaining stream.

Abstract: A method and associated systems for estimating losses in a fluid-distribution system, in which the fluid-distribution system may represented as a binary tree from which is generated a set of linear or nonlinear equations that express fluid losses as functions of measurements of characteristics of fluid flowing through the fluid-distribution system. Operations performed upon these equations to minimize measurement errors yield solutions that, when bounded by conditions derived from known physical and historical characteristics of the fluid-distribution system, allow inference of accurate loss locations and rates in the fluid-distribution system, even when the losses have not been measured directly or when measurements related to these leak losses contain measurement errors.

Abstract: Certain embodiments of the invention may include systems and methods for evaluating pipeline using GIS data. According to an example embodiment of the invention, a method is provided for evaluating pipeline using geographical information system (GIS) data. The method can include receiving component information from a GIS database for one or more components in a pipeline; determining a modified maximum allowable operating pressure (MAOPm) for the one or more components; determining an uprating pressure (MAOPm*) that the one or more components can withstand; and outputting a upgrade recommendation or an uprate recommendation based at least in part on the MAOPm and the MAOPm*.

Abstract: A method of storage tank monitoring including calculating liquid inventory within the storage tank. Real-time parameters associated with evaporative loss of a liquid stored within the storage tank are determined to produce input data. The real-time parameters include at least one condition within the storage tank and at least one environmental condition. Evaporative loss is automatically calculated with an inventory calculation algorithm using the input data and at least one known physical property of the liquid in the storage tank.

Abstract: Fluid flow properties often dictate the performance of processing operations. The present invention relates to a system for evaluating properties of a fluid flowing in a pipe. A test cell (20) which includes two parallel surfaces (5, 6) which are positioned in the flow. One of the surfaces is moveable relative to the other, to a position in close proximity to the other, to create a stagnant flow region between the surfaces. The system further includes a test input device (10) to apply input motion to one of the surfaces, and a test output device (13) to measure output motions from the cell in response to input motions. Furthermore, the system includes a processing device (9) to calculate rheological parameters of the fluid from signals produced from the test input and test output device. There is also a process for evaluating properties of a flowing fluid.