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Confidential and Proprietary Data
4.3 Alarm Interlocks
The safety interlocks are considered to be fail-safe and tested to be reliable under the
UL991 reliability testing criteria. By definition, these alarm interlocks do not depend on
the processor to generate the alarm output. The VaporGuard® was designed to be
used with Versum Materials, Inc. supplied bubblers only. These bubblers are
constructed with the appropriate features in order to safely operate in the
VaporGuard®. Refer to Chapter 5 for system operation on the individual interlock
circuits.
Table 4‐1
Alarm Interlocks
Alarm Names
Enable /
Disable
Selectable
Enable
Default
Setting
Default
value
Interlock
Selectable
Interlock
Default
Low Chem Level
no
enabled
11%
yes
not
interlocked
Probe Not Install
no
enabled
no
interlocked
Tool Not Ready
yes
disabled
yes
not
interlocked
Remote Stop
yes
disabled
Yes
not
interlocked
Temp High2
Alarm
yes
enabled
5ºC
yes
not
interlocked
Temp High1
Alarm
no
enabled
2ºC
yes
not
interlocked
Temp Low1 Alarm
no
enabled
2ºC
yes
not
interlocked
Temp Low2 Alarm
yes
enabled
5ºC
yes
not
interlocked