Deaeration device, droplet discharge device, deaeration performance deterioration determination method, and storage medium

A deaeration performance deterioration determination method of a deaeration device,

• wherein the deaeration device comprises:
• an external reflux-type deaeration module including a gas permeable membrane capable of removing dissolved gas in liquid,
• wherein the deaeration module includes a first vacuum chamber that communicates with a first end of the gas permeable membrane, a second vacuum chamber that communicates with a second end of the gas permeable membrane, and an atmospheric vent valve that opens or closes an inside of the deaeration module to atmosphere,
• wherein the deaeration performance deterioration determination method comprises:
• measuring a pressure deference between the first vacuum chamber and the second vacuum chamber when the deaeration module is atmospherically closed;
• and
• determining a deterioration in deaeration performance of the deaeration module based on the pressure difference.

A computer-readable storage medium storing a program for a computer of a deaeration device,

• wherein the deaeration device comprises:
• an external reflux-type deaeration module including a gas permeable membrane capable of removing dissolved gas in liquid,
• wherein the deaeration module includes a first vacuum chamber that communicates with a first end of the gas permeable membrane, a second vacuum chamber that communicates with a second end of the gas permeable membrane, and an atmospheric vent valve that opens or closes an inside of the deaeration module to atmosphere,
• wherein the program causes the computer of the deaeration device to function as:
• a controller that determines a deterioration in deaeration performance of the deaeration module based on the pressure difference when the atmospheric vent valve is closed.