Patent ID: 7402798
Filing Date: 2008-07-22
Classification: H01J

Abstract:
1. A system for controlling an electrostatically induced liquid spray comprising: an electrostatic spray device for generating a liquid spray from a liquid sample; a spray current sensing means placed in relation to the spray device and configured to generate a current output signal that represents a current of the liquid spray; a mechanism that receives the current output signal and compares it to a pre-selected current value, with a difference between the two representing a control signal tat is sent to one of (1) a pump that regulates the flow rate of the liquid sample and (2) a power supply to regulate an electric field associated with the spray device that generates the liquid spray according to a set level of current; and a mass spectrometer having an inlet for receiving the liquid spray, the current sensing means being disposed between an opening of the spray device though which the liquid spray is discharged and having a ring-shaped structure with an orifice through which the liquid spray passes.