Differential pressure gauge for filter
First Claim
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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; and
a circuit mounted on the circuit board, the circuit having a hall-effect sensor responsive to the magnet, a first set of electrical components, and a second 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, the second set of electrical components mounted on the same side of the circuit board as the hall-effect sensor, wherein the depth of the hall-effect sensor is greater than or equal to the depth of each electrical component in the second set of electrical components.
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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.
16 Citations
20 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; and a circuit mounted on the circuit board, the circuit having a hall-effect sensor responsive to the magnet, a first set of electrical components, and a second 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, the second set of electrical components mounted on the same side of the circuit board as the hall-effect sensor, wherein the depth of the hall-effect sensor is greater than or equal to the depth of each electrical component in the second set of electrical components. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 (8, 9, 10, 11, 12)
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13. 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 (14, 15, 16, 17, 18, 19, 20)
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Specification