摘要:
Die Messeinrichtung (3) ist zur Ermittlung des aus einem Hydranten (9) ausfliessenden Wasservolumens (V) konzipiert, wobei der Hydrant (9) an ein unter Druck stehendes Leitungsnetz angeschlossen ist. Die Messeinrichtung (3) ist fest im Hydranten (9) installiert und hat einen Strömungskörper (30), an dem zwei zueinander beabstandete Druckmessstellen (31,32) vorhanden sind, deren erfasste Werte zur Beaufschlagung eines Differenzdruckmessmoduls (34) bestimmt sind. Der vom Differenzdruckmessmodul (34) zum Zeitpunkt (t1) erfasste Differenzdruck (Δp) bildet ein Mass für den zu diesem Zeitpunkt (t1) aus dem Hydranten (9) ausfliessenden Volumenstrom (Q). Die vom Differenzdruckmessmodul (34) über die Zeitspanne (t) inkremental laufend erfassten Differenzdrücke (Δp) werden an einen Rechner übermittelt, mit dem das während der Zeitspanne (t) aus dem Hydranten (9) ausfliessende Wasservolumen (V) berechnet und protokolliert wird.
摘要:
A system and methods of estimating and controlling fuel flow in a gas turbine engine (20) are disclosed. The system and methods include providing a metering valve (112) and a pressure regulating valve (122). The system and methods further include determining a differential pressure error (216) of the pressure regulating valve (122) based on a metering valve inlet pressure (220), a discharge pressure (222), and a bypass fuel flow (218) and determining a metering valve fuel flow (230) based on a metering valve position (212) and the differential pressure error (216).
摘要:
In order to make highly accurate flow rate measurements over a broad range, the present invention provides a differential pressure flow meter 2 that detects differential pressures in a fluid body flowing along a flow path, and calculates a flow rate of the fluid body from those differential pressures, and that includes at least two differential pressure detecting portions 22 and 23 that have mutually different measurement ranges.
摘要:
Provided is a gas meter system capable of deriving a heating value of a gas with high accuracy. A gas meter system (100) includes a gas meter (110), a gas production plant (114), and a center device (116). The gas meter (110) includes a sound velocity derivation unit configured to derive a sound velocity of a gas supplied to a demand place. The gas production plant (114) includes: a gas production unit configured to produce the gas; and a gas characteristic identification unit configured to identify a gas characteristic representing a relationship between the sound velocity and a heating value of the gas based on an analysis result of a component of the gas produced by the gas production unit. The center device (116) includes a gas heating value derivation unit configured to derive the heating value of the gas passing through the gas meter based on the sound velocity of the gas, which is derived by the sound velocity derivation unit of the gas meter, and on the gas characteristic identified by the gas characteristic identification unit of the gas production plant.
摘要:
A method of determining a flow resistance across a particulate filter located downstream of an internal combustion engine in an exhaust system. The method comprises measuring a first differential pressure across the particulate filter, measuring a second differential pressure downstream of the particulate filter, determining a pressure ratio of the first differential pressure and the second differential pressure, and from said pressure ratio, determining a flow resistance across the particulate filter. The second differential pressure is measured across a selective catalytic reduction system.
摘要:
The invention relates in particular to a device (20) for measuring the flow rate and the viscosity of ink sent to a print head (50) of an ink jet printer, comprising: - a conduit (200), for supplying said print head (50), this conduit being provided with a 1 st pressure (Pin) sensor (26) at a first end and a 2 nd pressure (PHead) sensor (56) at a 2 nd end, - means (26, 56) for measuring at least the pressure (PHead) of the 2 nd pressure sensor (56) and the pressure difference (Pin - PHead) between the 1 st pressure sensor (26) and the 2 nd pressure sensor (56).
摘要:
The disclosure relates to a method for estimating a flow out of at least one fluid pump for injecting fluid in a well, comprising : - determining a calculation model for the flow rate of a pump exiting the at least one pump, said calculation model permitting the calculation of the flow rate in function of at least one calculation parameter ( p, SPM ) related to the at least one fluid pump ; then - providing at a plurality of measuring times (t m ), a set of measurement values ( p DH,m , p B,m , SPM DH,m , SPM B,m ) representative of said at least one calculation parameter ; then - estimating (86) the flow rate exiting the pump in function of the model and of said at least one calculation parameter.
摘要:
A method includes collecting (804) a set of process variable (PV) measurements generated using a sensor (108, 204, 306, 402, 500). The sensor is fluidly coupled to one or more impulse lines (110-112, 206, 310). The method also includes determining (806) a median fluctuation in the set of PV measurements and determining (1002) a ratio using the median fluctuation and a reference median fluctuation. The method further includes determining (808) whether at least one of the one or more impulse lines is plugged using the ratio. Determining whether at least one impulse line is plugged could include determining (1004) whether the ratio is below a threshold and, if so, determining (1006) that multiple impulse lines are plugged. Determining whether at least one impulse line is plugged could also include determining (1008-1010) whether the ratio is above a first threshold or between second and third thresholds and, if so, determining (1012) that a single impulse line is plugged.