Segmented online sampling apparatus and method of use
A segmented sampling apparatus is designed to extract a sample from a source and deliver the sample to a collector for storage or analysis. The sample is extracted from the source at a sample withdrawal or extraction rate but is delivered to the collector at a faster rate. Air is injected into or drawn into the apparatus which allows for an expedited sample delivery rate.
1. A method of capturing a sample from a source and delivering the sample to a collector, comprising:
drawing a sample from the source into a conduit;
advancing the sample within the conduit in a downstream direction toward a sample indicator, wherein the sample defines a leading end that approaches the sample indicator as the sample is advanced in the downstream direction;
indicating the presence of the sample within the conduit using the sample indicator when the sample attains a predetermined position within the conduit relative to the sample indicator;
injecting a gas into the conduit in response to the indication of the presence of the sample within the conduit, wherein the injection of the gas into the conduit forms a sample bolus between the downstream end of the sample and an upstream end of the sample formed by the injection of the gas into the conduit;
advancing the sample bolus together with the injected gas in the downstream direction past the sample indicator; and
delivering the sample bolus and the injected gas to the collector.
2. The method of claim 1 wherein the sample bolus is drawn from the source at a first flow rate and the sample bolus and injected gas are advanced past the sample indicator at a second flow rate faster than the first flow rate.
3. The method of claim 1 further comprising passing cleansing and/or sterilization fluid through the conduit after the sample bolus has been delivered to the collector.
4. The method of claim 1 wherein the step of injecting a gas into the conduit comprises injecting air into the conduit.