Provided are systems and methods for line volume calibration, and measurement of fluid samples delivered to an interrogation point. In various embodiments, a known fluid volume comprising a sample line fluid and a secondary fluid is delivered to a fluid boundary sensor. The fluid boundary sensor assists in determining the position of the boundaries between the various fluids, and the positions of these boundaries are used to determine the sample line fluid volume.

The invention relates to a mass flow controller designed for precise and rapid fluid flow management without using a proportional valve and a proportional-integral-derivative (PID) control loop. It features a solenoid control valve and a controller that uses a calibration database, potentially including a lookup table or neural network, to determine the appropriate solenoid coil current for various fluids, ensuring high-speed and accurate flow control.

The invention relates to a mass flow controller designed for precise and rapid fluid flow management without using a proportional valve and a proportional-integral-derivative (PID) control loop. It features a solenoid control valve and a controller that uses a calibration database, potentially including a lookup table or neural network, to determine the appropriate solenoid coil current for various fluids, ensuring high-speed and accurate flow control.