Online sampling system

Abstract

It is an object to enable a sample of a sample source to be injected into a LC while a pressure state of the sample source is maintained. There are provided an injector () including a first sample loop () and an injection valve (), a sample supply channel (), a pump part (), a second sample loop (), a sample source channel (), and a path construction part. The path construction part is configured to be capable of selectively constructing a sampling path and a sample supply path. The sampling path is configured so that the sample source channel () and the pump part () are fluidly connected to each other in a closed system with the second sample loop () interposed therebetween and the sample is drawn from the sample source to the second sample loop () using the pump part (), and the sample supply path is configured so that the second sample loop () is separated from the sample source channel () while maintaining a closed system state of the sample source channel () and the pump part () or another pump () different from the pump part and the sample supply channel () are fluidly connected to each other with the second sample loop () interposed therebetween and the sample held in the second sample loop () is supplied to the injector () through the sample supply channel () using the pump part () or the other pump ().