A liquid distribution system is configured to deliver a disinfectant solution to a medical device within an enclosure. A disinfectant concentration measuring subsystem includes a mixing chamber, a reservoir, a reservoir cap, a pump, and a concentration analysis assembly. The first mixing chamber is in fluid communication with an outlet of the liquid distribution system. The reservoir is configured to contain a reagent solution and is in fluid communication with the mixing chamber. The reservoir cap includes a static member, which is configured to couple with a supply conduit and a return conduit； and a rotating member, which is configured to rotate relative to the static member to couple the reservoir cap with the reservoir. The pump is configured to simultaneously pump the disinfectant solution and the reagent solution into the mixing chamber. The concentration analysis assembly is operable to determine a concentration of disinfectant output from the mixing chamber.一種液體分配系統經組態以遞送一消毒劑溶液至在一罩殼內之一醫療裝置。一種消毒劑濃度測量子系統包括一混合室、一貯器、一貯器蓋體、一泵、及一濃度分析總成。該第一混合室與該液體分配系統的一出口流體連通。該貯器經組態以納含一試劑溶液，並與該混合室流體連通。該貯器蓋體包括一靜態構件，其經組態以與一供應導管及一回流導管耦接；及一旋轉構件，其經組態以相對於該靜態構件旋轉，以耦接該貯器蓋體與該貯器。該泵經組態以同時泵送該消毒劑溶液及該試劑溶液至該混合室中。該濃度分析總成可操作以判定自該混合室輸出之消毒劑的濃度。
