Thermo Scientific 42iQ, Инструкция по эксплуатации

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Calibration
Equipment Required
Thermo Scientific 42iQ Instruction Manual 4-3
Fixed bed reactors are commonly used in the last step of zero air generation
to remove the remaining contaminants by either further reaction or
absorption.
Table 4–1 lists materials that can be effective in removing
contaminants.
Table 4–1. Scrubbing Materials
To Remove Use
NO Soda-Lime (6-12 mesh), Purafil
Hydrocarbons Molecular Sieve (4A), Activated Charcoal
O
3
and NO
2
Activated Charcoal
A gas phase titrator (GPT), such as is included in the Thermo Scientific
146iQ Multi-gas Calibrator
, is used to generate NO
2
concentrations from
NO concentrations. Figure 4–1 shows the suggested placement of the
component parts of a gas phase titration apparatus.
Equipment Damage All connections between components in the system
should be made with glass, PTFE, or other non-reactive material. ▲
The airflow controllers should be devices capable of maintaining constant
airflows within

2% of the required flow rate. The NO flow controller
should be capable of maintaining constant NO flows within

2% of the
required flow rate.
The pressure regulator for the standard NO cylinder must have a non-
reactive diaphragm and internal parts, and a suitable delivery pressure.
Scrubbing
Gas Phase Titrator
Flow Controllers
Pressure Regulator