Abstract: An integrated pump and sample vessel which eliminates dead volume between the point of collection of the sample and the sample vessel. The pump has a body with a longitudinal bore therethrough, a fluid flow passage in the body which allows fluid to enter and exit the pump, a resilient member located in the bore which has a face with a cavity therein exposed to the fluid flow passage and a sleeve which confines the resilient member. A sample vessel is adapted to be detachably mounted to the pump body with a face exposed to the fluid flow passage. A check valve is located in the sample vessel to selectively enable the entry of fluid from the flow passage of the pump. In the preferred embodiment, the check valve is located in an easily removable pod to facilitate service or adjustment. A diaphragm motor or other moving apparatus drives the face of the resilient member into contact with the face of an adapter or the face of the sample vessel which traps a sample of fluid in the cavity.

Abstract: In the preferred and illustrated embodiment of the disclosed apparatus, a constant pressure cylinder is set forth. Improvements included therewith are a vortex mixer for mixing the accumulated sample or specimen therein. The mixer is slidably mounted on a stainless steel centered rod to avoid damage to the cylinder wall surrounding said vortex mixer. The vortex mixer is slidably mounted on an elongate rod centered and aligned in the cylinder. Moreover, the device additionally incorporates a clear acrylic tracker tube receiving a piston tracker magnetically attracted to the piston for indicating to an observer the elevation of the piston in the constant pressure cylinder.