# US 11,906,990 B2 · Water level detection via pressure sensing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,990 B2 - Document ID: US11906990B2 - Status: Granted - Kind: B2 - Application number: 17/498,095 - Filed: 2021-10-11 - Published: 2022-01-27 - Granted: 2024-02-20 - Earliest claimed: 2018-07-25 - Assignees: Kohler Co. - Applicants: Kohler Co. - Inventors: Nameer Shaaban; Jason M. Kwacz - Web page: https://patentgrep.com/patent/US11906990B2 ## CPC - G01K 13/02: for measuring temperature of moving fluids or granular materials capable of flow - G05D 9/12: characterised by the use of electric means - G01F 23/18: Indicating, recording or alarm devices actuated electrically - G01K 13/00: Thermometers specially adapted for specific purposes - G01K 13/026: {of moving liquids} - G05D 23/19: characterised by the use of electric means {(G05D23/1393 takes precedence)} - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME ## Abstract A water level detection system includes a water containing vessel, an airtight tube fluidly coupled to the water containing vessel, a pressure sensor fluidly coupled to the airtight tube, and a water level control unit communicably coupled to the pressure sensor. The water level control unit is configured to control at least one of a height of water within the water containing vessel or a temperature of the water based on pressure data from the pressure sensor. ## Claims ### Claim 1 A water level detection system, comprising: a bathtub comprising a lower wall, a forward wall, a rear wall, and a pair of side walls, each of the forward wall, the rear wall, and the pair of side walls extending upwardly from the lower wall to define an interior volume, the bathtub further comprising a drain disposed in the lower wall and a drain conduit fluidly coupled to the drain; an airtight tube fluidly coupled to the drain conduit downstream from the drain and extending upwardly from the lower wall; a connector fluidly coupling the airtight tube to the drain conduit, the airtight tube disposed at a first axial end of the connector and a drain discharge disposed at a second axial end of the connector opposite the first axial end; a drain valve coupled to the drain conduit downstream of the airtight tube; a pressure sensor fluidly coupled to the airtight tube; and a water level control unit communicably coupled to the pressure sensor, the water level control unit configured to control at least one of a height of the water within the bathtub or a temperature of the water based on pressure data from the pressure sensor. ### Claim 2 (depends on 1) The water level detection system of claim 1, wherein the water level control unit is configured to determine the height of the water based on predetermined values of at least one of a volume of an interior of the bathtub, dimensions of the bathtub, or a weight of water corresponding to different water levels within the bathtub. ### Claim 3 (depends on 1) The water level detection system of claim 1, wherein the drain valve is operably coupled to the water level control unit and configured to drain the water from the bathtub, wherein the water level control unit is configured to control the drain valve to maintain the height of the water in the bathtub to be approximately equal to a predetermined water level threshold. ### Claim 4 (depends on 1) The water level detection system of claim 1, further comprising a faucet operably coupled to the water level control unit and configured to provide water to the bathtub, wherein the water level control unit is configured to control the faucet to maintain the height of the water within the bathtub to be approximately equal to a predetermined water level threshold. ### Claim 5 (depends on 1) The water level detection system of claim 1, further comprising a faucet and a temperature sensor, wherein the faucet and the temperature sensor are operably coupled to the water level control unit, wherein the faucet is configured to provide water to the bathtub, wherein the temperature sensor is configured to determine the temperature of the water, and wherein the water level control unit is configured to control the faucet to maintain the temperature of the water within the bathtub to be approximately equal to a predefined water temperature. ### Claim 6 (depends on 1) The water level detection system of claim 1, wherein the airtight tube extends in an upright direction that is oriented substantially perpendicular to the lower wall. ### Claim 7 (depends on 1) The water level detection system of claim 1, further comprising an orifice plate disposed along the airtight tube. ### Claim 8 (depends on 1) The water level detection system of claim 1, wherein the drain valve is coupled to the second axial end of the connector. ### Claim 9 (depends on 8) The water level detection system of claim 8, wherein the airtight tube extends away from the drain conduit in a first direction, wherein the drain valve extends away from the drain conduit in a second direction that is opposite the first direction. ### Claim 10 A water level detection system, comprising: a bathtub comprising a lower wall, a forward wall, a rear wall, and a pair of side walls, each of the forward wall, the rear wall, and the pair of side walls extending upwardly from the lower wall to define an interior volume, the bathtub further comprising a drain disposed in the lower wall and a drain conduit fluidly coupled to the drain; an airtight tube fluidly coupled to the drain conduit downstream from the drain and extending upwardly from the lower wall; a drain valve coupled to the drain conduit downstream of the airtight tube; a pressure sensor fluidly coupled to the airtight tube at a distal end of the airtight tube; an orifice plate disposed at a proximal end of the airtight tube; and a water level control unit communicably coupled to the pressure sensor, the water level control unit configured to control at least one of a height of the water within the bathtub or a temperature of the water based on pressure data from the pressure sensor. ### Claim 11 A method, comprising: receiving, by a controller, a first pressure of air from a pressure sensor that is fluidly coupled to an airtight tube, the airtight tube fluidly coupled to a drain conduit by a connector, the airtight tube disposed at a first axial end of the connector and a drain discharge disposed at a second axial end of the connector opposite from the first axial end, the drain conduit fluidly coupled to a drain disposed in a lower wall of a water containing vessel, the airtight tube coupled to the drain conduit upstream of a drain valve, the airtight tube extending upwardly from the drain of the water containing vessel, the water containing vessel configured to receive a volume of water; receiving, by the controller, a second pressure of air from the pressure sensor; and controlling, by the controller, at least one of a height of the water in the water containing vessel or a temperature of the water in the water containing vessel based on the first pressure of air and the second pressure of air. ### Claim 12 (depends on 11) The method of claim 11, further comprising determining, by the controller, a first height of the water by comparing the second pressure of air with the first pressure of air. ### Claim 13 (depends on 11) The method of claim 11, further comprising controlling, by the controller, a faucet based on the second pressure of air to maintain the height of the water in the water containing vessel to be approximately equal to a predetermined water level threshold. ### Claim 14 (depends on 11) The method of claim 11, further comprising: receiving, by the controller, temperature data from a temperature sensor, wherein the temperature sensor is configured to determine the temperature of the water within the water containing vessel; and controlling, by the controller, a faucet based on the temperature data to maintain the temperature of the water in the water containing vessel to be approximately equal to a predefined water temperature. ### Claim 15 (depends on 11) The method of claim 11, further comprising: receiving, by the controller, a third pressure of air from the pressure sensor; and determining a second height of the water based on the third pressure of air and at least one of the first pressure of air or the second pressure of air. ### Claim 16 (depends on 15) The method of claim 15, further comprising controlling, by the controller, the drain valve based on at least one of the second pressure of air or the third pressure of air to maintain the height of the water in the water containing vessel to be approximately equal to a predetermined water level threshold.