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公开(公告)号：US4248088A
公开(公告)日：1981-02-03
申请号：US42162
申请日：1979-05-24
申请人： James B. McGown , Ernest F. Root
发明人： James B. McGown , Ernest F. Root
摘要： A float is disclosed for use in tank gauging systems of the type having a vertically supported guide. The float includes a donut-shaped body member adapted to be positioned about the guide to ride freely with the liquid surface. A discharged tube is positioned concentrically with the body member by a number of support members. The discharge tube is positioned below the liquid surface and acts as a discharge electrode to maintain the path of least resistance for an electrostatic discharge of the float below the liquid surface.
摘要翻译： 公开了一种用于具有垂直支撑的导向件的罐式测量系统中的浮子。 浮子包括适于围绕引导件定位以与液体表面自由骑乘的环形本体构件。 排出的管与身体构件与多个支撑构件同心地定位。 放电管位于液体表面下方，用作放电电极，以保持液体表面下方的浮子的静电放电的电阻最小的路径。
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公开(公告)号：US4909090A
公开(公告)日：1990-03-20
申请号：US341883
申请日：1989-04-24
CPC分类号： G01N1/2214 , G01N1/24 , G01N2001/022 , G01N2001/028
摘要： Disclosed is a portable, hand-held vapor sampling probe for collecting vapors of compounds such as cocaine, heroin, and explosives prior to their desorption and analysis in a vapor detector. Rechargable batteries power a lamp in the front face of the probe for heating target portions of a sampling surface, a puffer assembly for directing air jets at the target, and a motor for drawing air samples through a collector coil on whose surfaces vapors are trapped. A flexible U-shaped shroud on the front face partially encloses the lamp and collector and helps to regulate air flow over the target and to protect the probe from damage. Upon contact with a surface, the shroud may activate a switch which, together with a second switch on the probe handle and a lamp pyrometer, regulates heating of the target.
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公开(公告)号：US4158964A
公开(公告)日：1979-06-26
申请号：US904692
申请日：1978-05-10
申请人： Peter F. McCrea , James B. McGown
发明人： Peter F. McCrea , James B. McGown
IPC分类号： G01F23/60 , G01F23/296 , G01F23/68 , G01F23/00
CPC分类号： G01F23/2963 , G01F23/68
摘要： An ultrasonic level measuring system is disclosed for determining by a time-ratioing technique the level of a liquid within a storage tank. An instrument sensor assembly, including a waveguide formed of a tensioned, ferromagnetic wire having a low thermoelastic coefficient is vertically supported within a storage tank containing a liquid. The waveguide is positioned to span both the tank liquid and vapor spaces. Two permanent magnets are positioned in close proximity to the waveguide at a known dimensional separation which defines the calibration span of the system. The waveguide and magnets are housed in a protective shield which acts as a process barrier and which is convoluted over a substantial portion of its length allowing the instrument sensor assembly to be easily transported and installed. A float, housing a permanent magnet, is positioned concentrically about the instrument sensor assembly to rise and fall with the liquid level.An ultrasonic transducer is formed of a field coil wrapped about a section of permanently magnetized, magnetostrictive wire. The magnetostrictive wire is butt welded to the top end of the waveguide.The field coil is excited by a current pulse introducing a torsional ultrasonic pulse into the waveguide. As the ultrasonic pulse passes each of the three magnets (i.e., the top, float and bottom magnets), a low level voltage pulse is generated across the waveguide. The voltage pulses are detected and amplified by sensing circuitry and coupled to a signal processing unit. The processing unit produces an output signal indicative of the liquid level by ratioing the time interval between the float and bottom magnets to the time interval between the top and bottom magnets. The resulting ratio is scaled by being multiplied by the known distance between the top and bottom magnets, (i.e., the calibration span) to produce a measure of the liquid level in the tank.
摘要翻译： 公开了一种超声波液位测量系统，用于通过时间比技术确定储罐内液体的水平。 包括由具有低热弹性系数的张紧的铁磁线形成的波导的仪器传感器组件垂直地支撑在容纳液体的储存罐中。 波导被定位成跨越罐液体和蒸气空间。 两个永久磁铁定位在靠近波导的一个已知的尺寸分离处，定义了系统的校准范围。 波导和磁体容纳在保护屏蔽中，该保护屏蔽件用作过程屏障，并在其长度的大部分上被卷绕，从而允许仪器传感器组件易于传输和安装。 容纳永磁体的浮子被定位在仪器传感器组件周围同心地与液面上升和下降。
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公开(公告)号：USD319796S
公开(公告)日：1991-09-10
申请号：US293142
申请日：1989-01-03
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