Beacon 410 Gas Monitor Operator’s Manual Alarm Indications • 31
Fail Condition
This section describes the indications for a fail condition and suggests responses to a fail
condition.
Fail condition indications
The Beacon 410 senses a fail condition for any of the following:
• the detector head wiring is disconnected or incorrectly connected;
• the display reading is -10% of full scale or lower;
• the Beacon 410 or one of it’s detector heads is malfunctioning.
When the Beacon 410 senses a fail condition, it alerts you as follows:
• the fail LED turns on;
• the gas reading for the failing channel is replaced by the FAIL message;
• the buzzer sounds a steady tone;
• the common fail relay de-energizes.
NOTE: If you elect to use relays A, B, C, and D as channel fail relays in the Configuration
Menu, the appropriate relay de-energizes in a fail condition. Relays A, B, C, and
D correspond to channels 1, 2, 3, and 4. See “Viewing and Changing Channel
Parameters” on page 36 for a instructions to define channel fail relays.
Responding to a fail condition
This section suggests responses to a fail condition.
1. Verify that the detector head wiring is correctly and securely connected.
2. See the troubleshooting guide in “Troubleshooting” on page 64.
Low DC Power Condition
This section describes the audible and visual indications for a low DC power condition and
suggests responses to a low DC power condition. This condition only occurs when DC
power is used as the primary or a backup power source
Low DC Power Condition Indications
The Beacon 410 senses a DC low power condition when the DC power source is 18.5 volts
or less.
WARNING: While in a low power condition, the Beacon 410 is not an active gas
monitor.
When the Beacon 410 senses a low DC power condition, it alerts you as follows:
• The FAIL LED turns on.
• The fail relay and all other relays are de-energized.
• The message LOW POWER S STANDBY is indicated on the top line of the LCD and
the input voltage is displayed on the bottom line of the LCD.
NOTE: The low DC power alarm cannot be cleared using the reset switch.
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