Interlogix 521BXT Two-Wire Smoke Detector w/ Heat Sensor

521BXT Smoke Detector, 500 Series, Photo, 2-wire, CleanMe®, 6-24VDC, fixed/rate of rise heat sensor

The 500 Series self-diagnostic, two & four wire smoke detectors are conventional direct-wire smoke detectors with analog features such as remote maintenance/trouble reporting (CleanMe®), drift compensation, and multi-criteria detection. The 500 Series continually monitor their own sensitivity and operational status, and provide a visual and remote trouble condition 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. The 521 has a unique feature enabling it to send a signal (CleanMe) to the 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 2-wire smokes are 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 two wire devices 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 500 series 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. And when the 500 series smoke detectors have told you that cleaning is necessary, it's literally a snap with a patented field replaceable optical chamber (part number 211).

Standard Features

• CleanMe® remote maintenance reporting reduces false alarms
• Smart dual fixed/rate of rise heat works with photo chamber to catch fires faster
• Built-in drift compensation reduces false alarms
• Field replaceable optical chamber makes servicing a snap
• Small, low profile design blends in with any environment

Specifications
Voltage
DIP switch 1 ON for standard 12V operation (6.5-20 VDC), polarity sensitive
DIP switch 1 OFF for standard 24V operation (8.5-33 VDC), polarity sensitive

Maximum ripple (pk to pk)
10% (V p-p)

Typical average standby current
70 uA (12/24V)
Typical alarm current (12/24V)up to 60mA max. if not limited by control panel

Aux. relay contacts
2A @ 30VDC

Alarm contacts
500mA @ 36VDC (resistive)

Photoelectic sensitivity
3.1% + 0.5 - 1.0%

Operating termperature
32° to 100°F (0° to 37°C)

Operating humidity range
0 to 95% non-condensing

RFI immunity
20V/m minimum; 0-1000MHz

Color
white head and base

Field wiring size
12-24 AWG

Heat detector specifications
rate of rise - 15 F/min and >105 F (8.3 C/min and >40.6 C)

UL 2-wire compatibility identifier:
521/528 - DIP switch 1 ON S09A
521/528 - DIP switch 1 OFF S10A, S11A (RX models)
511/518 S10A

Drift compensation adjustment 1.0%/ft. max

Detector head dimensions
5 in. (12.7cm) diameter; 2 in. (5cm) height

Mounting dimensions
4.75 in. (12.1cm) diameter; 0.3 in. (0.8cm) height
Reset time
1 second minimum
Listings:
511/521/541 UL 268
518/528/548 ULC