VICI 500 Dynacalibrator User Manual

Page 6

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Introduction

As indicated in Figure 1, the carrier stream passes through scrubber #1 and
micron line filter LF1 to the differential pressure regulator DPR1. The scrubber
contains specially-activated charcoal designed for broad-based scrubbing action.
This scrubbing medium is particularly effective in removing sulfur dioxide and
other sulfur compounds.

The differential pressure regulator and carrier flow restrictor FR1 together
provide a highly stable carrier stream flow rate to the permeation chamber.
The flow rate through the orifice is a function of the pressure differential across
it; this differential is maintained at 3.2 psi by DPR1.

Figure 1: Model 500 plumbing schematic

The output of the permeation chambers is fed forward to SV1 and SV2, respec-
tively. When the front panel switches are ON for SPAN 1 and/or SPAN 2, then the
respective carrier flows are routed through the valves’ C and NC ports and to the
mixing tee, where the calibrated dilution stream is added and mixed into it to set
the final concentration. When neither SPAN 1 nor SPAN 2 are selected, both SV1
and SV2 are de-energized, and the chamber output passes through its C and NO
ports to the chamber vent. The dilution stream alone then passes through the
mixing tee. The output of the mixing tee is split by another tee and fed to the
overflow vent and solenoid control valve SV3.

The overflow vent is usually left open, but can be plumbed to an external
exhaust port. Any exhaust plumbing must be sized so that it doesn’t cause any
increased pressure into the analyzer under calibration.

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Dynacalibrator 500

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