A perfusion system includes a fluid reservoir configured to hold a portion of fluid, the portion of fluid having a volume, the fluid reservoir having a total capacity that is greater than the volume; an imaging device, the imaging device configured to obtain image data corresponding to the fluid reservoir; and a controller. The controller is configured to receive the image data from the imaging device; determine the volume based on the image data; and facilitate control, in response to at least one of a user input and the determined volume of the portion of fluid, of an operating parameter corresponding to the fluid reservoir to facilitate changing or maintaining the volume of the portion of the fluid.

A method for calibrating a filling system is disclosed. In a first calibration step, a calibration of a calibration variable of a first flow or level measuring device is performed at a first calibration point. In a first deviation determination step, the first control and evaluation unit of the measuring device determines an average deviation of the calibration variable from a desired value. In a first correction step, the first control and evaluation unit corrects a calibration parameter taking into account the determined deviation. In a first transmission step, the first control and evaluation unit transmits the determined deviation and/or the corrected calibration parameter to the second control and evaluation unit. In a first adaptation step, the second control and evaluation unit corrects a calibration parameter at a first calibration point, taking into account the deviation transmitted by the first control and evaluation unit or the transmitted calibration parameter.

Provided are a device and a method for measuring fluid flow and pressure under a hyper-gravity environment. Two liquid reservoirs, a liquid level monitoring system, a flow monitoring system, a pumping system, and a pressure monitoring system are fixed to a base plate and disposed on a geotechnical centrifuge, where a flow pump is connected to an oil outlet of the geotechnical centrifuge; a pneumatic ball valve is provided with a gas source and connected to a gas outlet of the geotechnical centrifuge; and signals from the liquid level monitoring system, the flow monitoring system, the pumping system, and the pressure monitoring system are transmitted to a control center via a cable. The method includes: disposing the device on the geotechnical centrifuge, and acquiring fluid flow and pressure through the liquid level monitoring system and a pressure meter under a hyper-gravity environment.