VICI 340 Dynacalibrator - Manual (Page 5)

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Introduction
General Description
VICI Metronics Dynacalibrators ® use Dynacal ® permeation devices to generate
the precise gas concentrations necessary for calibrating air pollution analyzers,
monitors, and other instruments that measure gas concentrations in the parts-
per-million range and lower.
Dynacalibrators are available in three models, each with a large variety of
optional features to fit a wide range of calibration requirements. All critical
factors, such as permeation rates, gas flow rates, and permeation chamber
temperatures are calibrated against standards traceable to the National Institute
of Standards and Technologies.
Model 340 specifications are listed on page 5.
Dynacal Permeation Devices
Metronics Dynacal permeation devices are the simplest and most reliable
method for supplying a source of trace quantities of various gases. They can
accommodate virtually any requirement for generating low concentrations of
gases. Permeation rates from thousands of ng/min down to fractional parts of a
ng/min are possible. The devices can be supplied filled with any one of hundreds
of different compounds, both organic and inorganic.
How to Use This Manual
This manual provides installation, operation, and maintenance information for
all configurations of the Model 340. The identification tag on the rear panel of
every Dynacalibrator is stamped with the unit’s complete model number, which
reflects the exact unit configuration. A chart on the last page of the manual
explains the model numbers.
Basic Design
The Model 340 contains two calibrated gas regulating systems – the carrier system
and the dilution system. The fixed flow carrier gas system includes a permeation
chamber containing the permeation device. The temperature of the chamber,
which controls the permeation rate of the calibration gas from the permeation
device, is set and monitored at the front panel. The carrier stream is pumped
through the chamber to pick up the calibration gas and is then fed on to a mix-
ing tee. The chamber temperature is adjusted from 30°C (or 2°C above ambient,
whichever is higher) to 110°C.
The dilution gas stream flows through an adjustable valve and a flowmeter to
the mixing tee. Front panel access to the valve and flowmeter permits the user
to accurately set the dilution stream flow rate to the mixing tee, thereby setting
the concentration of calibration gas at the outlet port of the calibrator.