US 11,898,894 B2
Quality and quantity sensor with redundant low quantity measurement
Gregory P. Murphy, Janesville, WI (US)
Assigned to SSI TECHNOLOGIES, LLC, Janesville, WI (US)
Filed by SSI Technologies, LLC, Janesville, WI (US)
Filed on Aug. 25, 2021, as Appl. No. 17/411,375.
Prior Publication US 2023/0061414 A1, Mar. 2, 2023
Int. Cl. G01F 23/296 (2022.01); G01F 23/2962 (2022.01); G01F 23/80 (2022.01)
CPC G01F 23/2968 (2013.01) [G01F 23/2962 (2013.01); G01F 23/802 (2022.01)] 11 Claims
OG exemplary drawing
 
1. A fluid sensing system comprising:
a target positioned at a target level;
a first transducer configured to generate a first sound wave in a vertical direction and to detect a first echo of the first sound wave;
a second transducer configured to generate a second sound wave in the vertical direction and to detect a second echo of the second sound wave; and
an electronic processor configured to:
produce a first signal to drive the first transducer to produce the first sound wave,
receive a first indication of the first echo from the first transducer,
determine a first level of the fluid based on the first indication,
determine the first level of the fluid is less than or equal to the target level,
produce, in response to determining the first level of the fluid is less than or equal to the target level, a second signal to drive the second transducer to produce the second sound wave,
receive a second indication of the second echo from the second transducer, and
determine a second level of the fluid based on the second indication.