Fluid monitor system

A kit for performing a series of fluid flow monitoring operations comprising:

• (a) a monitor having a housing and fluid condition sensing and control means mounted to said housing in a predetermined pattern;
• (b) a cassette adapted to be removably mounted on said housing at a preselected location, the cassette including permanently connected walls defining a fluid flow path of predetermined configuration and cassette coupling means disposed in a pattern corresponding to said predetermined pattern of said sensing and control means for coupling said fluid condition sensing and control means to said fluid flow path of said cassette when said cassette is mounted at said preselected location on said housing;
• and
• (c) an adaptor adapted to be removably mounted on said housing at said preselected location, the adaptor including mounting means for mounting on said adaptor a tube system formed separately from the adaptor and definding a fluid flow path, the adaptor also including adaptor coupling means disposed in a pattern corresponding to said predetermined pattern of said sensing and control means for coupling said fluid sensing and control means to the fluid path of said tube system when said adaptor is mounted at said preselected location on said housing and said tube system is mounted on said adaptor,
• said monitor having engagement means for mounting either said cassette or said adaptor on said housing at said preselected location so that said monitor can be used sequentially with said cassette and with said adaptor to perform said series of monitoring operations and so that said fluid condition sensing and control means of said monitor may be coupled either to said fluid flow path defined by said cassette when said cassette is mounted on said housing or to the fluid flow path defined by said tube set when said adaptor is mounted on said housing;
• said fluid condition sensing and control means including a pressure transducer, said cassette coupling means including a pressure transmitting cavity communicating with said fluid flow path of said cassette and having a pressure transmitting wall bearing directly on said pressure transducer when said cassette is mounted on said housing, and said adaptor coupling means including a pressure transmitting cavity communicating with said fluid flow path of said tube system when said tube system is mounted on said adaptor and having a pressure transmitting wall bearing directly on said pressure transducer when said adaptor is mounted on said housing,
• said monitor including suction means for applying suction around said pressure transducer to maintain said pressure transmitting wall of said cassette coupling means or said adaptor coupling means in contact with said pressure transducer.