The RAS is a time-series water sampler for use in aquatic environments. The RAS can be deployed for a short time period (hours), or continuously up to 18 months. Sample capacity of the RAS 3-48-100 is 48 collection events at 100 ml each.

A series of features and options are employed in the RAS to ensure that the samples collected are unbiased. Acid cleaning cycles can be used throughout the deployment to remove bio-fouling and other contaminants. These cleaning cycles occur prior to every event and/or at intervals throughout the deployment. Additionally, the pump is placed downstream from the sample so that the sample water does not pass through the pump. Finally, the user is able to add fixative into the sample containers before each deployment.

The RAS uses an internal computer that operates both the patented multi-port valve and the positive displacement pump. The internal computer directs the flow of the acid wash, cleaning cycles and sampling through the multi-port valve. This valve safely seals the samples from each other and the ambient water. The internal computer also controls the flow and volume through the gear pump.

The menu-driven, user friendly, software is designed for maximum deployment flexibility. An external computer can access the internal computer via serial communications (RS-232). The RAS internal computer records a self diagnostic report along with each event record.

*U.S. Patent #5,341,834 & 5,441,071; Japan #248282

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