Performing a separation on a field flow fractonator

A system comprising:

• a memory;
• and
• a processor in communication with the memory, the processor configured to perform a method comprising
• executing a set of logical operations measuring a mass flow control valve position of a control valve connected to a mass flow controller coupled to a field flow fractionator and a pressure control valve position of a control valve connected to a pressure controller coupled to the field fold fractionator in an optimal stability state,
• storing the valve positions to a data store as preset values, and
• in response to receiving a switch mode command, executing a set of logical operations retrieving the preset values from the data store and setting initial conditions for the controllers corresponding to the preset values, resulting in a switch mode of the field flow fractionator.

A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform a method comprising:

• executing a set of logical operations measuring a mass flow control valve position of a control valve connected to a mass flow controller coupled to a field flow fractionator and a pressure control valve position of a control valve connected to a pressure controller coupled to the field fold fractionator in an optimal stability state;
• storing the valve positions to a data store as preset values;
• and
• in response to receiving a switch mode command, executing a set of logical operations retrieving the preset values from the data store and setting initial conditions for the controllers corresponding to the preset values, resulting in a switch mode of the field flow fractionator.

A system comprising:

• a memory;
• and
• a processor in communication with the memory, the processor configured to perform a method comprising
• executing a set of logical operations determining a focus flow offset value for the field flow fractionator via at least one experiment run on the field flow fractionator,
• wherein the focus flow offset value is added to a cross flow value of the field flow fractionator and a detector flow value associated with the field flow fractionator, resulting in a pump flow value for a pump connected to a field flow fractionator.