2-2. OPERATOR CONTROLS AND INDICATORS - continued.
Table 2-6. Purge System and Gas Alarm Controls and Indicators
Control or Indicator
Purge Doors Limit Switches
Provides signal to purge alarm buzzer if one of purge doors
is not opened when purge cycle is initiated.
Gas Alarm Green Pilot Light
Provides indication when the instrument power is on and
detector circuit is energized.
Gas Alarm Blue Fail Light
Provides indication when there is equipment failure or
Yellow Warn/Test Light
Provides indication when a combustible gas condition
exceeding the low alarm setting exists at the remote
detector, or when the alarm test switch has been activated.
When depressed, provides a simulation of an alarm level of
gas concentration at the remote detector. It also provides a
functional check of the analyzer and remote alarm circuit.
Alarm Reset Switch
When depressed, deactivates the holding circuits of the
alarm and warning relays if a safe gas condition has been
restored at the remote detector. If a safe condition does not
exist, the unit cannot be reset.
Provides indication of the concentration of combustible gas
at detection point.
Air System Controls and Indicators. Figure 2-7 and Table 2-7 list the controls and indicators for the air