PREALMalarm

Notifier NFS2-640: PREALM

Notifier NFS2-640·0 views·0 field notes

What This Code Means

A Pre-Alarm Warning indicates that a smoke detector has reached a programmed threshold (either Alert or Action level) that is below the actual alarm threshold, providing an early warning of potential fire conditions.

Common Causes

1Incipient or potential fire conditions
2Dust or dirt accumulation in the detector chamber
3Transient noise or electrical interference
4Environmental factors such as steam or aerosols
5High sensitivity settings (Self-Optimizing Pre-Alarm)

Resolution Steps

Identify the device location from the LCD display and investigate the area for signs of smoke or fire. Check the real-time smoke level percentage shown on the LCD. If the condition is an 'Alert' (non-latching), it will clear automatically when smoke levels drop. If it is an 'Action' (latching), press the RESET key after the condition has been cleared. Press ACKNOWLEDGE to silence the panel sounder.

Manual References(3)

1notifierNFS-640Operations2003Open

2notifierNFS-640Datasheet2006Open

3notifierNFS2-640Datasheet2017Open

Field Notes

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