Apparatus and method for characterizing performance of pumps and verifying accurate operation of flowmeters

A system comprising:

• a first container arranged inside a second container above a maximum fluid level of the second container;
• and
• one or more non-transitory machine readable media comprising program code that when executed by a computer causes the computer to,
• cause a valve of the first container to be opened to remove fluid from the first container into the second container;
• cause the valve of the first container to be closed based on a fluid sensor indicating that a fluid level in the first container is at a first fluid level;
• cause a pump to start pumping the fluid from the second container to the first container via a flow meter;
• receive an indication after the pump starts pumping the fluid;
• cause the pump to stop pumping the fluid from the second container to the first container based on the indication;
• determine an amount of fluid pumped into the first container based on the first fluid level and a second fluid level indicated by the fluid sensor;
• compare an indication of total fluid volume measured by the flow meter to the amount of fluid pumped;
• and
• output an indication of accuracy of the flow meter based on the comparison.