Apparatus to measure differential pressure with settable pressure reference
AssigneeHoneywell International Inc.
InventorsEdgar Robert Mallison, Thomas George Stration
Life of this patent
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Abstract
A differential pressure sensor for sensing changes in pressure at a desired location, which sensor includes a sensing portion and a reference portion to produce an output indicative of the difference therebetween, both the sensing portion and the reference portion being open to the pressure around the sensor until the sensor is located in the desired sensing location and then the reference portion is closed to capture the pressure then existing at the desired location and any pressure changes thereafter producing signals indicative of the pressure differences.
Claims24
A pressure sensor for determining the changes of pressure occurring at a desired location comprising:
- a sensing portion exposed to the pressure at the desired location;
- a reference portion having a conduit to temporarily expose the reference portion to the pressure at the desired location;
- and
- a closer operable to close the conduit after the pressure sensor is positioned at the desired location so as to capture the then existing pressure in the reference portion and thereafter, changes in pressure at the desired location affecting the sensing portion but not the reference portion so that the pressure sensor produces an output indicative of the pressure difference between the sensing portion and the reference portion.
The method of determining the differential pressure changes of a fluid in a remote source comprising the steps:
- A. positioning a first pressure sensor having sensing and reference portions at a first location in the remote source;
- B. allowing the pressure at the first location to fill the sensing and the reference portions;
- and,
- C. closing the reference portion to the pressure at the first location so that thereafter, the first pressure sensor produces signals indicative of the difference in pressure between the sensing and reference portions.
Apparatus for determining the flow of liquid from a remote pool wherein a plurality of pressure sensors are positioned at a plurality of desired locations in the pool comprising:
- sensing portions for each sensor exposed to the pressure at the desired locations;
- reference portions for each sensor having a conduit to temporarily expose the reference portion to the pressure at the desired locations;
- and
- a closer for each sensor operable to close the conduit after the pressure sensors are positioned at the desired location so as to capture the then existing pressure in the reference portion so that thereafter, changes in pressure at the desired locations affect the sensing portions but not the reference portions and the pressure sensors produce outputs indicative of the pressure differences at the desired locations.
Dependencies are inferred from the claim text.