613results about "Volume/mass flow by electric/magnetic effects" patented technology

Sensors that are capable measuring the rate of flow of a fluid that passes over the electrodes of the sensor. In these sensors, an electrode, designated the flow rate-determining electrode, is used in conjunction with the conventional electrodes, e.g., the working electrode, the reference electrode, and the counter electrode, to determine the rate of flow of the fluid. In one aspect, this invention provides a sensor for measuring the concentration of an analyte in a sample of fluid when the sample flows continuously over the electrodes of the sensor, especially when the rate of flow of the sample is relatively low. In another aspect, this invention provides a method for measuring the concentration of an analyte in a sample of fluid, wherein the rate of flow of the sample varies during the period of time that the sensor is in place. In a preferred embodiment, the sensor employs four electrodes, namely, a working electrode, a reference electrode, a counter electrode, and a flow rate-determining electrode. Alternatively, a single electrode that performs both the function of the reference electrode and the function of the counter electrode can replace the reference electrode and the counter electrode. In addition, a dummy electrode or a blank electrode can be used to compensate for interference from electrochemically active species. The reagent(s) specific to the analyte of interest is required to be deposited on the working electrode.

A medical device accessory comprising an interface configured to connect the medical device accessory with a medical device for administration of a medical treatment using the medical device and the medical device accessory, a plurality of electrical contacts proximate the interface, the electrical contacts comprising a lead electrical contact adapted to receive an voltage from a power source associated with the medical device and one or more identifying electrical contacts, and at least one conductor providing an electrical connection between the lead electrical contact and the one or more identifying electrical contacts. An arrangement of the one or more identifying electrical contacts connected to the lead electrical contact identifies a characteristic of the medical device accessory.

A flow sensor includes a fluid chamber configured to receive a fluid. A diaphragm assembly is configured to be displaced whenever the fluid within the fluid chamber is displaced. A transducer assembly is configured to monitor the displacement of the diaphragm assembly and generate a signal based, at least in part, upon the quantity of fluid displaced within the fluid chamber.

Tilting of a drip chamber from its vertical axis during fluid administration can have negative effects upon the accuracy of systems configured for drop counting and / or for volumetric measurement of individual drops passing through the drip chamber. To address these negative effects, in accordance with one embodiment of the present disclosure, a fluid delivery system that measures the flow volume of a fluid delivery system is disclosed, which includes an imaging apparatus that captures a first image of a drip chamber while a drop is falling therein and a second image of the drip chamber with no drop. Portions of each image that are in substantially the same position in each image are subtracted.

Tilting of a drip chamber from its vertical axis during fluid administration can have negative effects upon the accuracy of systems configured for drop counting and / or for volumetric measurement of individual drops passing through the drip chamber. To address these negative effects, in accordance with one embodiment of the present disclosure, a fluid delivery system engages in a fluid control process that comprises determining an error parameter, based at least in part on a tilt signal, generating an error condition, and either holding the fluid flow at the present rate or stopping the flow.

A system of one or more configurable flowmeters allows an individual, locally or remotely, to selectively activate one or more functions of the flowmeters. The individual is capable of selecting which parameter of the process flow that the flowmeter is to measure, thereby effectively providing latent functions that may be selectively brought on line or shut off. The system may also allow an individual, locally or remotely, to selectively activate one or more latent flowmeters in the system. The system may be a distributed control system (DCS), which receives input signals from conventional meters and devices in the process flow and provides control signals to one or more devices in the flow process. The system may also provide a method of flowmeter selection and billing.

A method for determining a fluid flow rate with a fluid control valve utilizes inherent characteristics of a particular valve in conjunction with easily measured parameters in order to determine a flow rate through the valve. A valve flow characteristic equation, a flow coefficient, and a rangeability for the valve are known and hardcoded into a chipset that controls the valve. A differential pressure transducer measures the pressure drop across the valve. A valve actuator controls the valve opening fraction. The differential pressure transducer and the valve actuator provide feedback signals to the chipset. The known and measured parameters are used to calculate an instantaneous valve characteristic and a fully-open flow rate for the valve. The instantaneous flow rate through the valve is then calculated from the instantaneous valve characteristic and the fully-open flow rate.

A system for monitoring water quality in a water meter data collection system having a plurality of metering end points (E) for measuring consumption includes a plurality of chemical biological and environmental sensors (S1, S2) disposed in a distribution system near or within the distribution end points (A, B), with the sensors (S1, S2) generating electrical signals through a network (G) that can be processed and communicated with the water meter data to a collection station (D) from the metering end points (E).

Fuel gauges for fuel supplies for fuel cells are disclosed. Each fuel gauge has a property that is readable by an electrical circuit. These properties are related to the remaining fuel in the fuel supplies. These properties include, but are not limited to, electrical capacitance, magnetic, semi-conducting resistance, bi-metal resistance, and oscillating magnetic field. These fuel gauges are functional at any fuel supply orientation.

Methods and apparatuses for determining a fluid parameter in a vessel by altering a property of the fluid, sensing the difference in the property after the fluid is altered, particularly as related to the property in an unaltered portion of the fluid.