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Magnetic field sensor feedback for diagnostics

A magnetic field sensor and sensor technology, which is applied in the direction of converting sensor output, instruments, buoy level indicators, etc., can solve problems such as difficult to determine or diagnose performance degradation or positive failure

Active Publication Date: 2021-01-19
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, without inspection and disassembly of the digital level controller and / or removal of the entire digital level controller, it is often difficult to determine or diagnose whether the Hall effect sensors, magnets, or other components of such a level controller are functioning degradation or positive failure

Method used

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  • Magnetic field sensor feedback for diagnostics
  • Magnetic field sensor feedback for diagnostics
  • Magnetic field sensor feedback for diagnostics

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Embodiment Construction

[0015] The present invention discloses magnetic field sensor feedback for diagnostics. Examples of the present disclosure enable a sensor system to generate diagnostic information of sensor system operating conditions. Examples of the present disclosure utilize multiple magnetic field sensors (e.g., Hall Effect sensors) to measure magnetic fields provided by and / or influenced by a magnetic field source, such as on a moving part of a process control device. the magnet. The magnetic field sensors of the disclosed examples provide an output signal (eg, a voltage signal) that is used to generate diagnostic information associated with feedback to a process control device.

[0016] Many known sensor systems (eg, digital level gauges) have a set of magnets on the movable part and a single Hall Effect sensor to determine magnet displacement through changes in the magnetic field as the magnets move. However, specific causal determination of failures is difficult in these systems beca...

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Abstract

The present invention discloses magnetic field sensor feedback for diagnostics. A disclosed exemplary apparatus includes a first magnetic field sensor to provide a first output signal in response to a magnetic field generated by a magnet coupled to a movable portion of a process control device, and a second magnetic field sensor to provide a second output signal in response to the magnetic field . The disclosed example apparatus also includes a processor to generate diagnostic information associated with feedback from the process control device using the first and second output signals.

Description

technical field [0001] This patent relates generally to magnetic field sensors, and more particularly to magnetic field sensor feedback for diagnostics. Background technique [0002] Digital level controllers typically include a displacer (eg, float) that moves linearly in response to liquid level and / or density. The linear motion of the float is transferred to the rotational motion of the torque tube which displaces a lever assembly with attached magnets or sets of magnets (eg, two to forty magnets, etc.). Movement of one or more magnets changes the magnetic field measured at the Hall effect sensor, causing the Hall effect sensor to provide an output signal that can be used to determine a process control value (eg, displacement measurement of a fluid). Typically, a single Hall effect sensor is placed in a digital level controller to detect the movement of the magnet. In practice, without inspection and disassembly of the digital level controller and / or removal of the enti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D9/12
CPCG01D3/08G01D5/145G01F25/20G01F23/38
Inventor M·陶C·W·戈
Owner FISHER CONTROLS INT LLC