The 541NB belongs to the 500N and 541 Series of photoelectric smoke detectors.
The ESL 500N series two- and four-wire conventional photoelectric smoke detectors bring together trusted technology and a full line of features to meet the demands of every type of application.
The 500N offers sounder models in two- and four-wire applications, specifically to meet residential code requirements, and are more sensetive to smoldering fires - the most common type of fire that occurs in homes - than ionization detectors
The ESL 500N series also offers choices for optional auxiliary relays and isolated heat sensors, not available before in the ESL 500 series. ESL 500N Series includes multiple criteria heat algorithms and self-diagnostics features.
Standard Features 500N Series Built-in sounder available in two- and four-wire models Patented CleanMeŽ feature Built-in dust compensation Field-replaceable optical chamber Small, low profile design blends in with any environment
The ESL 541 Series self-diagnostic, four-wire smoke detectors are the industry's first conventional direct-wire smoke detectors with analog features such as drift compensation and multi-criteria detection.
The 541 Series continually monitor their own sensitivity and operational status, and provide a visual indication if they drift out of the sensitivity range or fail internal diagnostics. This meets NFPA 72 field sensitivity testing requirements without the need for external meters.
Standard Features 541 Series On-site maintenance alert SmartHeat fixed/rate of rise heats work with photo chamber to catch fires faster Built-in drift compensation reduces false alarms Small, low profile design blends in with any environment