INFICON Composer Gas Concentration Controller - Manual (Page 193)

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Composer Operating Manual
Transducer
That portion of the instrument system containing the physical
measuring apparatus; including; the resonant chamber, gas line
connectors, heaters, PRT, sending microphones, receiving
microphone, and mounting enclosure.
Weight Fraction
A term used in the Bulk Flow Control mode that is used to describe the
portion of the total weight of gas flowing that belongs to a specific
component, usually the precursor. The range is 0 to 1.00.