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Principles of Operation Teledyne API – Model T700 Dynamic Dilution Calibrator
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10.2.1.2. Flow Control Assemblies for Optional O
3
Components
Whereas the gas flow rates for the final mixing of gases is controlled directly by the
calibrator’s MFCS, under direction of the CPU, other gas flow rates in the calibrator are
set by various flow control assemblies located in the gas stream(s). These orifices are
not adjusted but maintain precise volumetric control as long as the a critical pressure
ratio is maintained between the upstream and the downstream orifice.
Figure 10-1: Location of Gas Flow Control Assemblies for T700’s with O
3
Options Installed
The flow orifice assemblies consist of:
A critical flow orifice.
Two o-rings: Located just before and after the critical flow orifice, the o-rings seal
the gap between the walls of assembly housing and the critical flow orifice.
A spring: Applies mechanical force needed to form the seal between the o-rings, the
critical flow orifice and the assembly housing.
06873B DCN6388