Thermo Scientific FTIR, Руководство пользователя, Страница: 57 / 83

Operation
Sampling procedure for the Modular Gas
System
Accurate gas-phase analysis requires that the gas samples be delivered reproducibly through the
gas cell of the FTIR. Special care is given to maintain a constant temperature throughout the sample
chain, particularly for hot gases from combustion, as cold spots can cause water vapor or other high
boiling compounds to condense. Combustion samples also are often dirty with partially oxidized
particulates, which can clog the sample lines or coat the gas cell, decreasing energy throughput and
sensitivity. For all gas samples, repeatable pressure and flow through the gas cell are important to
reduce variation in predicted results.
The Modular Gas Sampling System (“ModGas”) draws gas samples from the user’s gas chamber
through the FTIR gas system for analysis. Below is an example procedure for how to collect time-
series data from a sample gas chamber, assuming the entire system has already been installed.
52 Modular Gas System User Guide Thermo Scientific