Differential pressure gauge for filter
First Claim
Patent Images
1. An apparatus for measuring the differential pressure of fluid in filter, the apparatus comprising:
- a housing defining a pressure chamber;
a magnet positioned within the chamber;
a circuit board;
a circuit mounted on the circuit board, the circuit having a hall-effect sensor responsive to the magnet and a first set of electrical components, the hall-effect sensor being mounted on one side of the circuit board and the first set of electrical components being mounted on an opposite side of the circuit board.
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Abstract
An apparatus for measuring the differential pressure of fluid in filter. The apparatus comprises a housing defining a pressure chamber. A differential pressure gauge divides the pressure chamber into first and second fluid chambers. The differential pressure gauge is arranged to measure a differential pressure between fluid in the first chamber and fluid in the second chamber. The differential pressure gauge has a variable output.
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Citations
26 Claims
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1. An apparatus for measuring the differential pressure of fluid in filter, the apparatus comprising:
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a housing defining a pressure chamber;
a magnet positioned within the chamber;
a circuit board;
a circuit mounted on the circuit board, the circuit having a hall-effect sensor responsive to the magnet and a first set of electrical components, the hall-effect sensor being mounted on one side of the circuit board and the first set of electrical components being mounted on an opposite side of the circuit board. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for measuring the differential pressure of fluid in filter, the apparatus comprising:
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a housing defining a pressure chamber;
a magnet positioned within the chamber;
a hall-effect sensor responsive to the magnet; and
a circular circuit board mounting the hall-effect sensor. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus for measuring the differential pressure of fluid in filter, the apparatus comprising:
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a sensor assembly including a housing and a sensor positioned within the housing, the sensor being responsive to magnetic fields;
a fluid assembly including a sleeve and a magnetic piston, the sleeve defining at least a portion of a pressure chamber, the magnetic piston positioned within the pressure chamber, the magnetic piston dividing the pressure chamber into a high-pressure portion and a low-pressure portion, the sleeve being formed with plastic. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of measuring differential pressure in a filter head, the filter head including a differential pressure gauge, the differential pressure gauge including a magnetic piston and a hall-effect sensor and a circuit, the hall-effect sensor output a sensor voltage in response to the magnetic piston, the circuit outputting an output voltage in response to the senor voltage, the method comprising:
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moving a magnetic piston in one direction while the differential pressure is increasing and in an opposite direction when the differential pressure is decreasing;
generating a sensor voltage, the amplitude of the sensor voltage corresponding to the position of the magnetic piston;
generating an output voltage in response to the sensor voltage; and
adjusting the output voltage to compensate for hysteresis in movement of the magnetic piston. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification