Analysis system

An analysis system comprising:

• a mobile phase supply section configured to supply a mobile phase;
• a sample injection device configured to inject a sample into the mobile phase supplied from the mobile phase supply section to produce a liquid sample;
• a field flow fractionator configured to classify particles in the liquid sample by applying a field to the liquid sample supplied from the sample injection device;
• a detector configured to detect the particles in the liquid sample classified by the field flow fractionator;
• a bypass flow path configured to directly fluidically connect the sample injection device and the detector;
• and
• a flow path switching unit configured to switch a flow path to guide the liquid sample from the sample injection device to the field flow fractionator or the bypass flow path,
• wherein the sample injection device is provided upstream of the flow path switching unit,
• wherein the bypass flow path is provided with a concentration adjusting device for adjusting a concentration of the liquid sample supplied from the sample injection device,
• wherein a quantity of the sample included in the liquid sample supplied to the field flow fractionator is the same as a quantity of the sample included in the liquid sample supplied to the bypass flow path, and
• wherein, prior to supplying the liquid sample to the detector by the bypass flow path, the concentration adjusting device dilutes the quantity of the sample included in the liquid sample supplied to the bypass flow path such that a first detection signal from the detector falls within a dynamic range of the detector.