External Gas Control Module; Gas Requirements - Agilent Technologies 4100 Site Preparation Manual

Accessories and Options
The special fittings supplied for use with organic solvents and hydrofluoric acid
NOTE
may not be suitable for acidic or alkaline solvents. The standard (originally
supplied) components should be retained for use in these applications.

External Gas Control Module

(Part number G8000-63005)
The External Gas Control Module (EGCM) has two specific functions:
1
2
The air facilitates the analysis of organics by MP techniques by
reducing carbon build-up and background signal resulting in lower
detection limits when analyzing organic solutions.
The EGCM can be used in conjunction with a cooled spraychamber.
This allows you to analyze directly, without dilution, organic
solutions with a high vapor pressure at room temperature (for
example, gasoline, naphtha). Cooling the sample prevents high vapor
pressures being generated in the spray chamber which can cause
back pressure in the chamber, destabilizing the plasma and
suppressing the analytical signal.

Gas requirements

All gas supply installations must comply with rules and/or
regulations that are imposed by the local authorities responsible for
the use of compressed gas in the workplace.
38 Agilent 4100 Microwave Plasma Atomic Emission Spectrometer Site Preparation Guide
Supply nitrogen gas to purge the optics system for
determinations of sulfur.
Introduce a small amount of air into the plasma for the analysis
of volatile organics.