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System Manual
Oxford Instruments Plasma Technology
OpAL
3.12
Gas handling
WARNING
CONTACT WITH TOXIC GASES CAN CAUSE DEATH OR SERIOUS
INJURY.
USERS SHOULD PERFORM THEIR OWN RISK ASSESSMENT OF
HAZARDOUS GASES TO BE USED ON THE SYSTEM.
BEFORE VENTING THE PROCESS CHAMBER, ALWAYS ENSURE THAT
THE SYSTEM IS ADEQUATELY PURGED AND PUMPED. SEE SUB-
SECTION 5.8.6.
The process gas handling system is supplied as one of two options:
a)
An internal gas “pod” which requires 2 bubbler and purge gases fitted inside
the main console and an additional 2 process gases which are fitted inside the
precursor cabinet.
b)
An 8-line gas pod. See sub-section 3.12.4, page 3-39.
Depending on the machine specification and process gases used, the gas lines fitted can
be non-toxic and/or toxic. See sub-section 3.12.1 (non-toxic) and 3.12.2 (toxic).
3.12.1
Standard non-toxic gas line
The standard non-toxic gas line is shown in Fig 3-30. All gas fittings are VCR and all
stainless steel pipework connections are welded. The ‘gas in’ tube passes into the side of
the case, protected by a grommet. A ferrite core, fitted to the ‘gas in’ tube, reduces the
susceptibility of the gas pod electronics to signals from nearby transmitting devices, e.g.
mobile phones, modems, etc.
Gas from the customer’s cylinder/regulator/filter flows into the ‘gas in’ tube to the filter.
The gas flows through the 2-µm filter to the mass flow controller (MFC). The MFC
controls the flow of gas as commanded by the system controller. The gas then flows
through the pneumatically controlled outlet shut-off valve and into the gas out manifold
where it is mixed with the other process gases before flowing into the process chamber.
WARNING
IF THE SHUT-OFF VALVE IS CLOSED, IT REMAINS SHUT FOR
DIFFERENTIAL PRESSURES UP TO 5 BAR. A FAILURE UPSTREAM,
WHICH PRODUCES LINE PRESSURES ABOVE THIS, WILL NOT BE
CONTAINED. IF THIS PRODUCES A HAZARD, THE CUSTOMER IS
WARNED TO FIT ADDITIONAL PROTECTION UPSTREAM.
Description
Printed: 07 August 2009 07:42
Page 3-35 of 46
Issue 1: August 07
Содержание OpAL
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