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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.
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Rosellajefferson@dfwind.com (Rosella Jefferson) for more information. All emails will be forwarded to the poster's actual email address.
