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Use of the "I" gas line option
For ASM 180 TD and ASM 180 TD+
9/11
Edition 03 - May 97
Alcatel Vacuum Technology France - ASM 180 TD/TD+ - ASM 181 TD+ User’s Manual
C 70
Gradually open the carrier gas supply until the maximum
flow allowed is obtained.
The detector must remain in Fine Leak test mode.
The inlet pressure and the cell pressure increase as the
carrier gas flow increases.
If the detector switches to Gross Leak mode, reduce the
carrier gas flow.
The length of time it takes for the pressure to stabilize in the
gas line depends on the length of the gas line.
If a mass flow controller (
7
) is
used, the maximum carrier gas
flow can be defined quickly
before connection to the
installation, by connecting the
injection system directly to the
detector.
The maximum flow is of the
order of 40 to 60 SCCM or
0.6 to 1 atm.cm
3
/s for the
ASM 180TDI.
Inject the carrier gas
N
2