Hewlett-packard Company

Terry A Woodruff

Robert P Rhodes

Andrew J Murphy

Apparatus for igniting a flame ionization detector wherein means are provided for gradually reducing the flow of oxygen to the jet in response to a sudden increase in the temperature at a point downstream from the jet and wherein normal oxygen flow is restored after the temperature decreases to an operating value.

Automatic ignition system for a flame ionization detector

Sample and reference fluids are made to alternately fill the volume of a concentration detector and remain there while measurements are made.

Detector with intermittent flow

The continuous flow of sample fluid, e.g., the elution from the column of a chromatograph, is modulated with the aid of a storage volume such that the flow of sample fluid into the fluid input of a detector varies between maximum and minimum values at a given frequency, the flow of reference fluid to the fluid input of the detector is modulated out of phase, and the differences in output of the detector resulting from these modulated flows is derived by a synchronous detector or demodulator.

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Kennett Square, PA, United States of America

Terry A Woodruff