User guide

Beacon 800 Gas Monitor Operator’s Manual Alarm Indications • 18
Alarm Indications
This section describes the Beacon 800 in alarm 1, alarm 2, and fail conditions, and
suggests responses to these conditions. Table 4 lists the alarm indications for each
condition.
NOTE: The Beacon 800 includes alarm on and alarm off delay settings for each channel
and level of gas alarm. The alarm indications described in this section operate
according to the default delay settings. See Chapter 5: Configuration Menu for
detailed information on displaying or changing the alarm on and alarm off delay
settings.
NOTE: You can set the channel relays to be normally energized or normally de-
energized in the Configuration menu. The following sections describe the default
setting: normally de-energized.
Common alarm 1 and alarm 2 relays are factory-set as normally de-energized,
and the common fail relay is factory-set for normally energized. The common
relays are not user adjustable.
Table 5: Visual and Audible Alarm Indications
Condition Cause Visual Indication(s)
Audible
Indication
Alarm 1 Increasing (decreasing for O
2
) gas
reading at or above the alarm 1
setpoint
• ALARM 1 light is on
• Gas reading flashes and
alternates with ALARM-1
message
Steady tone
Alarm 2 Increasing gas reading at or above
the alarm 2 setpoint
• ALARM 1 and ALARM 2
lights are on
1
• Gas reading flashes and
alternates with ALARM-1
and ALARM-2 messages
Steady tone
Fail • Disconnected or misconnected
transmitter wiring
• Display reading below -10% of
fullscale or lower
• Malfunctioning components
• FAIL light is on
• FAIL message flashes in
place of gas reading
Steady tone
Low
Battery
2
No AC power and DC power
source (primary or backup) less
than 21.5 volts.
• FAIL light is on
• Top screen displays
SUPPLY VOLTAGE IS
TOO LOW message
• Bottom screen displays -
LOW POWER
STANDBY- message
and actual voltage of
incoming DC power
None
1
The ALARM 1 light is not on for oxygen channels.
2
If DC power is used as primary or backup power source.