A fluid collection canister comprising a fluid level sensor assembly for monitoring a fluid level in the fluid collection canister of a medical waste fluid collection system, the fluid level sensor assembly comprising: a fluid level sensor configured for monitoring the fluid level in the fluid collection canister, the fluid level sensor including: a sensor body having electrical components therein; an elongate sensor probe extending from the sensor body; and a float assembly movable relative to the elongate sensor probe along a longitudinal axis of the elongate sensor probe with a change in the fluid level in the fluid collection canister such that as the fluid level in the canister rises, the float assembly travels longitudinally along the sensor probe, away from the sensor; a fluid level sensor cover configured for preventing direct contact between the fluid level sensor and a fluid in the fluid collection canister, wherein the fluid level sensor cover includes: a cap formed of a polymeric material, the cap having a lower end, an upper end and a passage extending therethrough from the lower end to the upper end; and an elongate tubular sheath formed of a polymeric material, the elongate tubular sheath having a first end, a second end, and a lumen extending from the first end toward the second end, wherein the first end is attached to the cap such that the passage of the cap is in communication with the lumen of the elongate tubular sheath and the second end of the elongate tubular sheath is closed; wherein the elongate sensor probe is extendable into the lumen of the elongate tubular sheath through the passage of the cap such that the elongate tubular sheath surrounds the elongate sensor probe; wherein the fluid level sensor cover includes a first o-ring seal disposed on the lower end of the cap configured to seal against an upper surface of the sensor body and wherein the fluid level sensor cover includes a second o-ring seal disposed on the lower end of the cap, the second o-ring seal coaxially surrounding the first o-ring seal, the second o-ring seal configured to seal against a surface of the fluid collection canister. a fluid level sensor configured for monitoring the fluid level in the fluid collection canister, the fluid level sensor including: a sensor body having electrical components therein; an elongate sensor probe extending from the sensor body; and a float assembly movable relative to the elongate sensor probe along a longitudinal axis of the elongate sensor probe with a change in the fluid level in the fluid collection canister such that as the fluid level in the canister rises, the float assembly travels longitudinally along the sensor probe, away from the sensor; a sensor body having electrical components therein; an elongate sensor probe extending from the sensor body; and a float assembly movable relative to the elongate sensor probe along a longitudinal axis of the elongate sensor probe with a change in the fluid level in the fluid collection canister such that as the fluid level in the canister rises, the float assembly travels longitudinally along the sensor probe, away from the sensor; a fluid level sensor cover configured for preventing direct contact between the fluid level sensor and a fluid in the fluid collection canister, wherein the fluid level sensor cover includes: a cap formed of a polymeric material, the cap having a lower end, an upper end and a passage extending therethrough from the lower end to the upper end; and an elongate tubular sheath formed of a polymeric material, the elongate tubular sheath having a first end, a second end, and a lumen extending from the first end toward the second end, wherein the first end is attached to the cap such that the passage of the cap is in communication with the lumen of the elongate tubular sheath and the second end of the elongate tubular sheath is closed; a cap formed of a polymeric material, the cap having a lower end, an upper end and a passage extending therethrough from the lower end to the upper end; and an elongate tubular sheath formed of a polymeric material, the elongate tubular sheath having a first end, a second end, and a lumen extending from the first end toward the second end, wherein the first end is attached to the cap such that the passage of the cap is in communication with the lumen of the elongate tubular sheath and the second end of the elongate tubular sheath is closed; wherein the elongate sensor probe is extendable into the lumen of the elongate tubular sheath through the passage of the cap such that the elongate tubular sheath surrounds the elongate sensor probe; wherein the fluid level sensor cover includes a first o-ring seal disposed on the lower end of the cap configured to seal against an upper surface of the sensor body and wherein the fluid level sensor cover includes a second o-ring seal disposed on the lower end of the cap, the second o-ring seal coaxially surrounding the first o-ring seal, the second o-ring seal configured to seal against a surface of the fluid collection canister.