2 positioning, 3 integration with the instrument, 4 maximum pressure considerations – INFICON Composer Gas Concentration Controller User Manual
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Composer Operating Manual
1.10.5.2 Positioning
There is no preferred orientation for the Transducer. It is, however, best to
maintain the correct inlet / outlet convention. However, if the connections to the
inlet and outlet are reversed, there will be no difference in performance until the
flow exceeds about 1000 sccm. The inlet tube is intentionally longer than the
outlet tube so that the incoming gas more closely reaches the Resonant
Chamber’s temperature before entering.
1.10.5.3 Integration With The Instrument
There is a single Interconnection Cable between the Transducer and Controller.
Connect this cable after physical installation of the Transducer and Controller.
This cable has three standard lengths, 5’ (152.4 cm),
10’ (304.8 cm), and 20’ (609.6 cm). Use the shorter length whenever possible.
Cables over 20’ (609.6 cm) are not recommended!
1.10.5.4 Maximum Pressure Considerations
Reliable measurement of concentration to pressures as low as 70 Torr (9.33
kPa) [absolute] requires relatively flexible diagrams to be used so that sufficient
acoustic energy may be transmitted.
There is a possibility that diaphragms may destructively rupture if more that 8.2
atmospheres (gauge) pressure is applied. A secondary containment vessel is
built into all transducers produced after July 1998, See
for proper leak check procedures, and
for performance
verification procedures.