Home -> Sensors Photoelectric 2-Wire Smoke Detector With CleanMe Our Price $35.95 to $38.95 Product Variation 521BXT - Two Wire Smoke Detector with Built in Heat Detector $38.95 521B - Two Wire Smoke Detector - No Heat Detector $35.95 Buy item(s) The ESL 521 Series self-diagnostic, two-wire smoke detectors are the industry's first conventional direct-wire two wire smoke detectors with analog features such as remote maintenance/trouble reporting (CleanMe®), drift compensation, and multi-criteria detection. , 6/12 Or 12/24 Vdc. S09A, S10A Compatible The 521 Series two wire smoke detetor continually monitors their own sensitivity and operational status, and provides a visual and remote trouble condition if the detector drifts out of the sensitivity range or fail internal diagnostics. This meets NFPA 72 field sensitivity testing requirements without the need for external meters. The 521 has a unique feature enabling it to send a signal (CleanMe) to the ESL 505 module (sold separately) when it has drifted outside of its UL Listed sensitivity range or has failed its internal diagnostics test. The 505 is an interface module that will signal a 24V panel via relays when the 521 is dirty. Several 12V and 24V control panels have the CleanMe software built in, eliminating the need for the 505 module. When CleanMe is not desired, simply leave the switch on the 521 off and it will work as a normal two wire detector. CleanMe allows the installer time to schedule a service call and avoid a false alarm. Time between cleaning detectors is dramatically increased because of the 521's built-in drift compensation. This feature, usually only available in analog systems, allows the detector to automatically adjust its sensitivity over time as it becomes dirty, increasing the life of the detector. When the 521 has told you that cleaning is necessary, it's literally a snap with ESL's patented field replaceable optical chamber. Photoelectric 2-Wire Smoke Detector Users Manual: Download the Photoelectric 2-Wire Smoke Detector Manual Related Items Worth Considering ESL Safeair Carbon Monoxide Detector Photoelectric 4-Wire Smoke Detector With Optional Heat Sensor Product Variation 521BXT - Two Wire Smoke Detector with Built in Heat Detector $38.95 521B - Two Wire Smoke Detector - No Heat Detector $35.95 Buy item(s)