Sensor with electrical contact protection for use in fluid collection canister and negative pressure wound therapy systems including same

A negative pressure wound therapy system, comprising:

• a collection canister comprising a chamber configured to collect wound fluids;
• a sensor configured to detect a volume of fluid collected with the collection canister, the sensor comprising:
• a first electrode including a first portion and a second portion, wherein the first portion of the first electrode is supported by a surface of the collection canister, and the second portion of the first electrode extends into the chamber;
• a second electrode including a first portion and a second portion, wherein the first portion of the second electrode is supported by the surface of the collection canister, and the second portion of the second electrode extends into the chamber;
• wherein a change in an electrical property associated with the first and second electrodes indicates that a particular volume of fluid has been collected in the collection canister;
• and
• an inner wall disposed within the chamber, wherein the second portions of the first and second electrodes are disposed within an area between the surface of the collection canister and the inner wall.