Apparatus and method for measuring fluid density
A liquid density and instrument technology, applied in specific gravity measurement, measurement device, measurement flow/mass flow, etc., can solve the measurement error and other problems, and achieve the effect of wide application, simple operation and small measurement error
Inactive Publication Date: 2007-01-17
CALIBRON SYST
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However, the resonant frequency also depends on the pressure-induced stress on the pipe, which can lead to errors in the measurement
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[0013] exist figure 1 Among them, the actuator 10 and the sensor 12 are installed on the outer wall of the vibrating tube 14 . The vibrating tube 14 is installed in a flowing liquid system (not shown) such as a chemical plant, refinery or food processing plant, it can be directly installed on the liquid system so that all liquids flow through it, or as a The detector, mounted in the manner shown in US Pat. No. 5,974,858 (issued Nov. 2, 1999, the publication of which is incorporated herein by reference). The output of sensor 12 is coupled via amplifier 11 to actuator 10 which also includes a feedback loop with delay 16 . The actuator 10 and sensor 12 are typically piezoelectric or magnetic devices, and by means of a feedback loop from the sensor 12 to the actuator 10 the vibrating tube 14 vibrates at its resonant frequency or a harmonic thereof. Amplifier 11 powers this vibration, and the phase shift of the output of sensor 12 to the input of actuator 10 depends in part on th...
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Apparatus for measuring fluid density in a fluid system has a sheath that surrounds a vibrating tube. The sheath and the tube form a cavity filled with a fixed amount of fluid. A pressure compensating element has a housing in which first and second pressure responsive surfaces are disposed. The first surface is in fluid communication with the cavity and the second surface is in fluid communication with the housing. A passage extends between the interior of the tube and the interior of the housing to exert the tube pressure on the second surface. The pressure on the second surface is transmitted to the cavity by the element to compensate for changes in the tube pressure. A method of compensating for line pressure changes in a densimeter that has a vibrating tube to sense density. A fixed amount of fluid fills a cavity formed around the tube. A first pressure responsive surface is in fluid communication with the cavity and a second fluid responsive surface is in fluid communication with the tube. The pressure on the second surface is transmitted to the cavity to compensate for changes in the tube pressure.
Description
technical field [0001] The invention relates to an instrument and method for measuring liquid density. technical background [0002] Instruments that measure the density of liquids are called densitometers. Density meters are used in chemical processes, pipelines, food processing, and other similar applications. [0003] A density meter measures the resonant frequency of a vibrating, liquid-laden pipe, which depends on the density of the liquid flowing through the pipe. However, the resonant frequency also depends on the pressure-induced stress on the pipe, which can lead to errors in the measurement. Contents of the invention [0004] The object of the present invention is to provide an instrument and method for measuring liquid density, which can be used to measure the density of flowing liquid and also can be used to measure the density of static liquid, with simple operation, small measurement error, high accuracy and wide application. [0005] To achieve the above ...
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IPC IPC(8): G01N9/24G01N9/00
CPCG01N9/002G01F1/8418G01F1/849G01F1/8409G01F1/8413
Inventor 爱德华E·弗朗西斯科·JR提姆A·马克格莱恩
Owner CALIBRON SYST