| US 7,490,513 B2 | ||
| Method for sensing levels of conductive liquids | ||
| Philip E. Salzmann, Cardiff, Calif. (US); Alec T. Harootunian, San Diego, Calif. (US); Michael P. Emery, Santee, Calif. (US); Javier H. Flores, San Diego, Calif. (US); Todd N. Bennett, San Diego, Calif. (US); and Minh Vuong, San Diego, Calif. (US) | ||
| Assigned to Vertex Pharmaceuticals, Inc., Cambridge, Mass. (US) | ||
| Filed on May 10, 2007, as Appl. No. 11/747,142. | ||
| Application 11/747142 is a division of application No. 10/900996, filed on Jul. 28, 2004, granted, now 7,219,545. | ||
| Prior Publication US 2007/0204690 A1, Sep. 06, 2007 | ||
| Int. Cl. G01F 23/00 (2006.01) | ||
| U.S. Cl. 73—304R [73/304 C; 73/290 R] | 7 Claims |
| 1. A method of sensing a liquid level of a conductive liquid, comprising:
energizing a first electrode of a plurality of electrodes with an applied electrical signal for a period of less than one
second; and
sensing said applied electrical signal with a detection circuit, wherein the detection circuit comprises two comparator circuits
with different reference inputs, and wherein the detection circuit is coupled to a second electrode and configured to discriminate
between partial and total submergence of the first or the second electrode.
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