GAS FLOW CONTROLLER Russian patent published in 2014 - IPC G05D7/00 G01N30/02 

FIELD: power engineering.

SUBSTANCE: gas flow controller is proposed for a gas chromatograph, comprising a pressure stabiliser, the inlet of which is connected to a gas manifold, a gas flow sensor, a programmer - a gas flow setter. It contains an electronic controller containing a low-frequency filter with proportionate-integral-differential (PID) law of regulation, one of inlets of which "setting action" is connected with the "control" outlet of the programmer-setter of gas flow, and the second "signal" inlet is connected with the signal outlet of the gas flow sensor, which represents a converter of mass gas flow - voltage, at the same time the flow sensor is connected by its gas outlet with the gas inlet of the analytic part of the chromatograph, and the gas inlet is connected with the gas outlet of the pressure stabiliser, which represents an electronic pressure controller "downstream" and including a pneumatic proportionate valve with electronic control, connected pneumatically between the inlet of the gas manifold and the outlet of the pressure stabiliser. The electromagnet of the drive is connected with the outlet of the comparison circuit, one of inlets of which is connected with the control outlet of the controller with the proportionate-integral-differential law of control, and the second inlet with the signal outlet of the converter pressure-voltage, connected pneumatically to the gas outlet of the pressure stabiliser.

EFFECT: increased absolute and relative accuracy to maintain gas flow and analysis accuracy in chromatographs.

4 cl, 1 dwg