公开(公告)号：US5392349A

公开(公告)日：1995-02-21

申请号：US885098

申请日：1992-05-18

Applicant: Joseph M. Elder, Jr.

Inventor： Joseph M. Elder, Jr.

IPC: H02H3/20 ,  H04M3/18 ,  H04Q3/42 ,  H04M7/00

CPC classification number: H04M3/18 ,  H04M2201/80

Abstract: By opening switches coupling a subscriber loop to circuits in a SLIC when an overvoltage condition occurs, the SLIC is protected from damage. The overvoltage is detected by a overvoltage protector behind the switches. The overvoltage condition is latched and the common control is notified of the condition. The common control may then clear the latch, reclosing the switches. If the overvoltage still exists, the switches are re-opened and maintenance personnel is notified of the fault.

Abstract translation: 当发生过电压状态时，通过打开将用户环路耦合到SLIC中的电路的开关，可以保护SLIC免受损坏。 过压由开关后面的过电压保护器检测。 锁存过压状态，通知通用控制条件。 然后，公共控制可以清除闩锁，重新闭合开关。 如果过电压仍然存在，则重新打开开关，并通知维护人员故障。

公开(公告)号：US4804944A

公开(公告)日：1989-02-14

申请号：US91848

申请日：1987-09-01

Applicant: James D. Golladay ,  Joseph M. Elder, Jr.

Inventor： James D. Golladay ,  Joseph M. Elder, Jr.

IPC: G01F23/00 ,  G01F23/68 ,  G01F23/72 ,  G08B21/18 ,  G08B21/00

CPC classification number: G01F23/68 ,  G01F23/0023 ,  G01F23/686 ,  G01F23/72 ,  G08B21/182 ,  Y10S250/90

Abstract: Disclosed herein is a Hall-effect liquid level sensing apparatus and method. The device may be mounted on a liquid storage tank and includes at least one float suspended within the tank and floating upon a hollow tube for guidance. The float carries a permanent magnet and a Hall-effect sensor may be reciprocated within the hollow tube to sense the location of the permanent magnet and thereby the location of the float. The device further includes a control device including an optical encoder which enables the device to sense the depth in the hollow tube to which the Hall-effect device has travelled when it senses the height of the permanent magnet. The invention may be used in conjunction with a plurality of floats to determine not only the liquid level but also the level between the liquid and a diverse liquid contained within the same container. In this embodiment, the invention may also be used in conjunction with a specific gravity measuring device so as to ensure that the pressure sensing orifice of the specific gravity measuring device is suspended within the liquid the specific gravity of which is desired to be measured.

Abstract translation: 这里公开了一种霍尔效应液面检测装置和方法。 该装置可以安装在液体储罐上，并且包括悬浮在罐内的至少一个浮子并浮在中空管上用于引导。 浮子携带永磁体，并且霍尔效应传感器可在中空管内往复运动以感测永磁体的位置，从而感测浮子的位置。 该装置还包括一个控制装置，该控制装置包括光学编码器，当该装置感测到永久磁铁的高度时，能使该装置感测霍尔效应装置所行进的中空管的深度。 本发明可以与多个浮子一起使用，以不仅确定液位，而且确定液体和容纳在同一容器内的不同液体之间的水平。 在本实施例中，本发明还可以与比重测量装置结合使用，以确保比重测量装置的压力感测孔悬挂​​在其比重被期望测量的液体内。