Adjusting device for pressure detector

An adjusting device for a pressure detector, the pressure detector including

• a case connectable to a flow route for liquid, and
• a membrane member attached to the case and separating a liquid-phase portion to be supplied with the liquid in the flow route and a gas-phase portion to be supplied with gas from each other, the membrane member being displaceable in accordance with a pressure of the liquid supplied into the liquid-phase portion,
• the pressure detector detecting the pressure of the liquid in the flow route by detecting a pressure in the gas-phase portion,
• the adjusting device comprising:
• piping having one end and an other end, the one end serving as a connecting portion connectable to the gas-phase portion, the other end allowing the gas to be introduced into or discharged from the piping;
• a pump that introduces or discharges the gas into or from a portion of the flow route in the piping and the gas-phase portion through the other end of the piping, the piping and the gas-phase portion being connected to each other through the connecting portion;
• a closing unit capable of closing a predetermined position of the flow route in the piping and separating the flow route in the piping into a first zone nearer to the other end and a second zone nearer to the one end by the closing;
• a control unit capable of controlling the pump and the closing unit and that sequentially executes a first step in which a predetermined adjusting pressure is generated in the first zone by activating the pump with the first zone being closed by the closing of the closing unit, and a second step in which the gas-phase portion, the first zone, and the second zone are combined into a closed space by disabling the closing of the closing unit;
• and
• an adjusting-pressure-acquiring unit that acquires the adjusting pressure to be generated in the first step, the adjusting pressure being acquired in accordance with a relationship between a pressure and a capacity of the first zone in the first step and a pressure and a capacity of the combination of the gas-phase portion, the first zone, and the second zone in the second step,
• wherein the control unit brings the membrane member to a position corresponding to the adjusting pressure by executing the second step after activating the pump in the first step in such a manner as to generate the adjusting pressure acquired by the adjusting-pressure-acquiring unit.