VICI 500 Dynacalibrator - Manual (Page 14)

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Carrier/Dilution Inlets
All 500 Series Dynacalibrators are configured with either a single inlet (500-0-***)
or a dual inlet (500-1-***) and therefore require an external source of pressur-
ized gas. On dual inlet systems two different types of gas can be used – one for
dilution and one for carrier. The most commonly used gas is dry air; however, dry
nitrogen or any other comparably inert gas including ambient air may also be
used.
CAUTION: Externally supplied pressurized gas sources MUST
be limited to a pressure range of 10 psig minimum to 25 psig
maximum at these inlets.
Span and Zero Outlets
The primary outlet on the Model 500 is labeled SPAN OUTLET. The span outlet
may be either permanently plumbed to the calibrate input port of an analyzer
or temporarily connected to its sample input for calibration, depending on the
capabilities of the analyzer.
NOTE: The span outlet port should be directly connected
to the analyzer input with a minimum length of tubing.
Altering the output stream in any manner may affect the
concentration of calibration gas in the stream.
Overflow Vent
All Dynacalibrators include an overflow vent to dump excess calibration gas,
ensuring that analyzers sensitive to sample feed pressure receive a supply from
the Dynacalibrator at near atmospheric pressure. The overflow vent is therefore
usually left open, or plumbed to an external exhaust point with large diameter
tubing. External devices (filters, etc.) or tubing with too small a diameter on the
overflow vent may cause an undesirable increase of pressure at the analyzer’s
input.
Getting Started