Bellows pump device

A bellows pump device that supplies pressurized air to a hermetic air chamber thereby to cause a bellows disposed within the air chamber to perform contraction operation to discharge a transport fluid, and discharges the pressurized air from the air chamber thereby to cause the bellows to perform expansion operation to suck the transport fluid, the bellows pump device comprising:

• an electropneumatic regulator configured to adjust an air pressure of the pressurized air to be supplied to the air chamber, such that the air pressure is increased so as to correspond to a contraction characteristic of the bellows during the contraction operation of the bellows;
• a temperature detection unit configured to detect a temperature of the transport fluid;
• and
• a control unit configured to control the electropneumatic regulator such that a pressure increase coefficient used in increasing the air pressure increases as a detection value of the temperature detection unit decreases.