Used with FlexStream or Span Pac I Gas Standards generators to dynamically generate ppb calibration standards of arsine in a matrix of nitrogen, air, or polymerization grade ethylene or propylene, the FPK Gas Permeation Tubes emit a small, steady flow of arsine vapor that is set by the temperature of the tube. Concentrations from below 10ppb to over 500ppb can be produced. That flow is mixed in the standards generator with a controlled flow of clean matrix gas to form the calibration gas mixture. Mixture concentration is adjusted by changing the matrix gas flow rate. Calibration based on the Standard Additions Principle compensates for unknown residual arsine in the matrix gas.
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