New Page 1ESL Sentrol 521NXBT 2-Wire Smoke With ROR Heat Product Scope
ESL smoke detectors are photoelectric and range in applications from 12/24V AC/DC hardwire for residential or to battery operated wireless transmission to 120VAC direct wire products. Model types are as varied as necessary to meet virtually every application need- whether it be residential, commercial or industrial. Electronic Heat Detectors are available in four styles featuring either 135oF or 194oF single circuit fixed temperature models to 135oF or 194oF 4 single circuit fixed and rate of rise temperature models. Manual Fire Alarm (Pull) Stations: Choices include single action, dual action hex and/or key reset model options. Units use terminal or pigtail connectors and are UL- CSFM listed. A weatherproof model is available. SpecificationsProduct Data
2-wire Voltage
Dip switch 1 on 6.5-33VDC, polarity sensitive
Dip switch 1 off 8.5- 33VDC, polarity sensitive
4-wire Voltage 8.5- 33VDC
Maximum ripple (pk to pk) 10% (V p - p )
Typical average standby current (24V) 70µA
Typical alarm current (6/12/24V) 2-wire up to 60mA max (if not limited by control panel)
Typical alarm current (6/12/24V) 4-wire 15mA
Alarm Contacts 500mA @ 36VDC (resistive)
Aux. Relay contacts 1A @ 30VDC (resistive)
Sensitivity (photoelectric) 3.1% + 0.50 -1.00%
Operating temperature 32°F to 100°F (0 to 37°C)
Operating humidity range 0 to 95% Non-condensing
RFI Immunity 20V/m minimum; 0-1000MHz
Field wiring size 12-24 AWG (16-22 recommended)
Heat detector specifications
Rate of rise 15°F/min and >105°F (8.3°C/min, > 40.6°C)
Fixed 135°F (57°C) UL two-wire compatibility identifier Dip switch 1 on S09A
Dip switch 1 off S10A, S11A
Drift compensation adjustment 1.0%/ft. max
Reset time 1 second minimum Detector head dimensions
Diameter 5 (127mm)
Height 2 (51mm) Mounting dimensions
Diameter 4.75 (125mm)
Height 0.3 (8mm) Color White head and base Listings UL, CSFM, MEA (2-wire only) Dimensions 
UL LISTED 4-wire, photoelectric, 12-24 VDC
4-wire, photoelectric, 12-24 VDC, multi-criteria algorithms, fixed/rate of rise heat Test magnet in plastic shell for pole mounting Architectural andEngineering SpecificationsThe ESL 500 Series photoelectric smokedetector is a low-profile, self-diagnostic, two-wire detector that monitors its ownsensitivity and operational status. This detector meets NFPA 72 field sensitivityrequirements without the need for external meters. Built-in drift compensationautomatically adjusts the sensitivity as the detector gets dirty. Normal sensing occursevery 9 seconds. This rate doubles when a signal exceeding the alarm threshold value issensed. Two additional successive signals above the threshold level will initiate analarm. See installation instructions for information about correct installation andmaintenance. The proprietary optical sensing chamber is field replaceable, allowing quickand easy cleaning and maintenance.
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