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Principle of
Operation
Ozone Generation
Thermo Fisher Scientific
Chapter 1
Introduction
The Model 146i Multi-gas Calibrator dilutes calibration gases to precise
concentrations. The diluted gases are used to perform zero, precision and
Level 1 span checks, audits, and multipoint calibration of analyzers. The
design of the Model 146i meets or exceeds all published U.S.
Environmental Protection Agency requirements for multipoint calibration,
audit, Level 1 span and precision checks.
For details of the calibrator's principle of operation and product
specifications, see the following topics:
"Principle of
●
"
S
pecifications" on page
●
3
All of the components used such as mass flow controllers, ozone generator,
permeation tube oven, power supplies, solenoid valves, and photometer
have been used previously for calibration purposes, and are known for their
accuracy and reliability. In the Model 146i, these components are
integrated into a single microprocessor-controlled unit. The instrument can
be controlled locally via the front-panel interface or remotely, using a
datalogger or computer.
Dilution
The standard Model 146i hardware/plumbing configuration comprises gas
and zero air flow controllers, as shown in
handle three gas standards, controlled by individual solenoids (a six-gas
option is also available). The zero air flow and the gas flow are regulated by
mass flow controllers. The zero air controller is high flow (typically 10 slm
full scale). The gas flow controller is low flow (typically 100 sccm). A
Teflon mixing chamber is used to achieve complete mixing of the two
components at the desired concentration level. This hardware/plumbing
configuration allows precision gas dilution.
The Model 146i can be equipped with an optional internal ozone
generator. The hardware/plumbing configuration of the standard
instrument with the ozone generator is shown in
Operation" on page
1-1
1-7
Figure
1–1. The basic unit can
Figure
1–2. The generator
Model 146i Instruction Manual
1-1
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Troubleshooting
