Liquid chromatograph

A liquid chromatograph comprising:

• a mobile phase delivery section for sending a mobile phase by a delivery pump, the mobile phase delivery section including, between mobile phase channels connected respectively to a plurality of mobile phase containers and the delivery pump, channel switching valves for selecting one of the mobile phase channels, the channel switching valves having a hierarchical structure where the channel switching valve on a lower stage side is connected optionally to any input port of the channel switching valve on an upper stage side, the channel switching valve on an uppermost stage side being connected to the delivery pump;
• a sample introduction section for introducing a sample into an analysis channel connected on a downstream of the mobile phase delivery section;
• a column arranged on a downstream of the sample introduction section, for separating an introduced sample;
• a detector arranged on a downstream of the column, for detecting a sample component separated by the column;
• a program control section storing an analysis program;
• a delivery control section configured to control an operation of the mobile phase delivery section according to an instruction from the program control section;
• a valve connection state setting section configured to set a connection state of the channel switching valve on a lower side to the channel switching valve on an upper stage side and a connection state of the mobile phase channels to the channel switching valves;
• and
• a per channel total delivery amount calculation section configured to calculate a total delivery amount of mobile phase per mobile phase channel based on a connection state according to the valve connection state setting section, a delivery amount per unit time by the delivery pump, and an operation time of the delivery pump.