Abstract:
A vacuum container having a vacuum producing means, mounted on a vehicle, a trailer, or skid mounted, with options chosen from an articulating boom, a water jetter system, a liquid pressure dissipating means, a valve actuator, and a drive motor for the valve actuator being either hydraulic, air, or electric powered, a global positioning system to determine and log the position of work, service or hardware, controls and measuring devices and de-chlorinator.
Abstract:
A self-diagnostic measurement method to detect microbridge null drift and performance. An ASIC can be designed to include a self-diagnostic feature that automatically occurs at start up or upon command in Normal Operation whereby the temperature compensated microbridge null can be measured in a state of very low thermal energy and allows for the tracking of microbridge null stability versus time. An Airflow Combi-Sensor ASIC (Heimdal) with its strategic partner ZMD can be developed and can be implemented in the form of a self-diagnostic feature that occurs when power is first applied to the ASIC or upon command. When the self-diagnostic is initiated, power is removed and after the electronics have settled, a small power can be applied to the microbridge to measure the bridge null with reduced sensitivity to flow due to self-heating.
Abstract:
A ventilation-mast monitoring system for filling stations contains a thermal through-flow measuring device (30) and a hydrocarbon-measuring device (30). The thermal through-flow-measuring device (30) has a heating device and a temperature sensor which is located in the flow path and reacts to the temperature of the heating device, and is configured to sense the gas volume flow escaping from a reservoir tank (1) via a ventilation mast (4) of the reservoir tank (1) of a filling station or entering the reservoir tank (1). The hydrocarbon-measuring device (30) is configured to sense the direction of the gas volume flow escaping from or entering the reservoir tank (1) via the ventilation mast (4). A control device which is configured to receive and to process measuring signals emitted by measuring devices of the system is preferably provided as a further system component.
Abstract:
A flow responsive valve for a flow metering system comprising a fluid meter having a minimum measuring flow threshold. The valve is shiftable between an open position at flow rates above the minimum measuring flow threshold, and a pressure pulsating position depending on pressure differential over an inlet port and an outlet port of the valve. The pressure pulsating position alters between a closed position essentially prohibiting fluid flow therethrough at flow rates below the minimum measuring flow threshold, and an open position admitting fluid flow into the supply line at a measurable flow rate above the minimum measuring flow threshold.
Abstract:
A magnetoinductive flow measuring method serves to measure the flow rate of a medium traveling through a measuring tube, while with the aid of at least one field coil a magnetic field is generated with a magnetic field component that extends in a direction perpendicular to the axis of the measuring tube. The electrical resistance of the field coil is measured and the temperature of the field coil, constituting a first temperature, is calculated based on the measured resistance of the field coil. A temperature measurement, constituting the second temperature, is taken at a location other than that of the field coil and the temperature of the flowing medium is calculated on the basis of the first and second temperatures. This provides the user of the flow measuring method an added benefit in that it gives the possibility, in simple fashion, to determine the temperature of the flowing medium. A flowmeter for measuring flow according to the method is also disclosed.
Abstract:
A multivariable transmitter has a microprocessor for executing a computation processing task with using a plurality of physical quantity signals. The microprocessor executes a processing for obtaining data from a sensor every computation processing task and executes the computation processing task in a time-division manner.
Abstract:
A flow sensor includes sensors connected to a flexible membrane. The sensors detect ambient temperature, pressure, and flow rate of a medium. A method of sensing flow rate includes providing the flexible membrane; coupling the plurality of sensors to the flexible membrane; and detecting ambient temperature, pressure, and flow rate of the medium by the sensors. A flow sensing system includes the flow sensor, an operational amplifier, and a closed loop controller. The sensors are connected in a Wheatstone bridge configuration. The operational amplifier is connected to the Wheatstone bridge and outputs a pressure signal representative of the pressure of the medium. The closed loop controller is connected to the operational amplifier and controls a current through a heating element for a resistor in the bridge such that a voltage across the operational amplifier is substantially zero. The output of the closed loop controller represents the flow rate.
Abstract:
An apparatus for monitoring a measurement transmitter of a field device determining and/or monitoring a physical and/or chemical process parameter, wherein at least one sensor is provided inside a housing, in which the transmitter is arranged. The sensor determines the temperature and relative humidity in the housing over a period of time in predetermined intervals, and a control-/evaluation-unit is provided, which, on the basis of the measured temperature and relative humidity, determines the absolute humidity and/or the dewpoint in the housing of the transmitter, and issues and alarm when the absolute humidity and/or the dewpoint in the housing of the transmitter reaches a critical value.
Abstract:
An improved rotary fluid meter is provided having expansion chambers for conditioning pressure pulses that may occur in the flow of fluids. The pressure pulses, which inhibit the meter's ability to accurately measure, may originate from within a metering device or from without it. The pressure pulses may be generated upstream of the meter. Fluid flows into the meter through a fluid flow conduit. At least one flow conditioning chamber which is of such a volume and a shape as to enable it to substantially dampen pressure pulses so as to improve the accuracy of the rotary meter is provided along the fluid flow conduit.
Abstract:
A device is described, for the adjustment of the flow rate of a liquid which circulates within thermal convectors or heat exchangers making up part of heating, conditioning or ventilation plants, or apparatus for the thermal treatment of products. The device comprises a body within which a movable shutter is provided, the position of which allows for adjusting the quantity of liquid flowing between at least an inlet duct and an outlet duct, the positioning of the shutter being obtained by way of a suitable actuator.The device comprises a control circuit and an instant flow rate and/or quantity meter of the liquid flowing in one of said ducts, for the automatic and continuous adjustment of the flow, by way of the appropriate positioning of the shutter.