56 Agilent Restricted Agilent 5110/5100 ICP-OES Service Manual
3 General Information
Gas Control
Gas Control
The Agilent 5110 Gas distribution and control is managed by the Gas Control Module which
resides on the right hand side of the instrument. Communication with instrument control is via a
high speed SLIP bus.
The module controls delivery of plasma gases and nebulizer gas with the plasma gas module
and purge gases with the purge gas manifold. The purge gas manifold’s function is to provide
purge gases to the snout and cone as well as the polychromator.
The manifolds contain PWM proportional solenoid valves to regulate gas flow for all gas
channels in both the plasma and purge manifolds.
All plasma gases (including oxygen blend option gas), nebulizer gas,and polychromator purge
gas measure (and report back) flow using the mass flow control method. This is achieved by
measurement of differential pressure (upstream pressure –downstrem pressure) and when
coupled with measuring upstream temperature equates to measurement of gas flows (mass
flow control).
Cone and Snout purge use proportional valves to control flow and also measure and record
pressure and temperature readings upstream of an orifice (choke control) but there is no mass
flow readback as actual flow accuracy is not required for these purge gases.
The gas control system also has provision for additional bolt on gas supply options to allow
nitrogen to be used as an alternate optics purge gas and oxygen as an additional gas for
working with difficult samples such as organics to prevent carbon build up.
Ar (Primary Gas Argon):
• Plasma generation
• Cone and snout purge
• Sample introduction system
• Polychromator and pre optics purge system
N
2
(Alternate Gas):
• Nitrogen for Polychromator and Pre optics purge
Option (Oxygen):
• 80% Argon/ 20% Oxygen blend for plasma when analyzing organics.
Figure 13. 3 Gas options available
The polychromator of the Agilent 5110 ICP-OES spectrometer default purge gas is argon but
can be purged with Nitrogen if the optional 3 gas purge option is installed. The gas purge
options are fitted in the gas control manifold and are customer installable.
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