Supercritical fluid device

A supercritical fluid device comprising:

• an analytical channel;
• a liquid delivery part for delivering a mobile phase constituting a supercritical fluid in the analytical channel;
• a back pressure regulator for controlling a pressure of the analytical channel so as to cause the mobile phase in the analytical channel to reach a supercritical state;
• a sample injecting device that includes a sample holder for holding a sample and a switching valve for switching between a state where the sample holder is arranged on the analytical channel and a state where the sample holder is not arranged on the analytical channel;
• a bypass channel whose one end is connected to a position upstream of the sample injecting device and whose other end is connected to a position downstream of the sample injecting device on the analytical channel;
• an analytical column for separating a sample introduced by the sample injecting device into individual components, the analytical column is provided downstream of the position to which the other end of the bypass channel is connected on the analytical channel;
• and
• a split channel that branches from the analytical channel at a position downstream of a position to which the other end of the bypass channel is connected on the analytical channel and upstream of the analytical column.