General Description, Mounting | System Sensor 24ATR specification

Figure 2. Surface mounting of 2112/24ATR smoke detector on 31/2-inch and 4-inch octagonal box:

A78-2563-03

General Description

Model 2112/24ATR is a 4-wire photoelectronic smoke de- tector that uses a state-of-the-art optical sensing chamber. This detector also provides restorable, 135˚F fixed-tem- perature heat detection. The units have a heat detection unit that is integrated with the photoelectronic sensor.

In addition, a piezoelectric horn in each detector produces an interrupted, 85 dBA tone when the individual detector alarms or when the supply voltage polarity is reversed.

NOTE: In order for all detectors on a loop to sound when the panel alarms, the panel must reverse the supply volt- age polarity to that loop upon alarm. For panels that do not reverse the polarity during alarm, a reversing relay, such as Systems Sensor’s RR-2, must be used. The RR-2 is designed to allow all the detectors in the same loop to sound when one of the detectors goes into alarm. Some panels may require the use of programmable outputs. Refer to System Sensor literature for further information on the RR-2.

Installation of this detector is simplified by the use of a mounting bracket and a plug-in screw terminal block that can be prewired to the system, allowing the detector to be easily installed or removed for cleaning. The detector’s sensitivity can be tested in place using the MOD400R Test Module.

An LED on the detector provides a local visual indication of the detector’s status. If power is applied to the detector and it is functioning normally in standby within the listed sensi- tivity range, the status LED blinks every ten seconds. The LED also latches on in alarm.

If the LED stops blinking, the unit should be removed for maintenance and inspection.

Mounting

Each 2112/24ATR detector is supplied with a mounting bracket that permits the detector to be mounted:

1.To a single gang box, or

2.Directly to a 3-1/2 inch or 4 inch octagonal box, or

3.To a 4 inch square electrical box by using a plaster ring.

4.Directly to the ceiling using drywall anchors, if permitted by local codes and/or the authority having

jurisdiction.

Tamper-resistant Feature

This detector includes a tamper-resistant feature that pre- vents its removal from the bracket without the use of a tool. To make the detector tamper-resistant, remove the smaller tab by breaking it at the scribed line on the tamper resistant tab on the detector mounting bracket (see Figure 3), then install the detector. To remove the detector from the bracket once it has been made tamper resistant, use a small screw- driver to depress the tamper-resistant tab, located in the slot on the mounting bracket, and turn the detector coun- terclockwise.

Wiring Installation Guidelines

All wiring must be installed in compliance with the Na- tional Electrical Code, applicable local codes, and any spe- cial requirements of the local authority having jurisdiction. Proper wire gauges should be used. The conductors used to connect smoke detectors to control panels and accessory devices should be color-coded to reduce the likelihood of wiring errors. Improper connections can prevent a system from responding properly in the event of a fire.

The screw terminal block accepts 14 – 22 gauge wire. For best system performance, all wiring should be installed in separate grounded conduit. Do not mix fire system wiring in the same conduit as any other electrical wiring. Twisted pair may be used to provide additional protection against electrical interference.

Smoke detectors and alarm system control panels have specifications for allowable loop resistance. Consult the control panel specifications for the total loop resistance al- lowed for the control panel being used before wiring the detector loops.

Figure 3. 2112/24ATR smoke detector mounting bracket:

TAMPER SLOT (DEPRESS TAB TO REMOVE DETECTOR)

TAMPER RESISTANT TAB (CUT OFF SMALL TAB TO ACTIVATE TAMPER-RESIST FEATURE)

ALIGNMENT

ARROWS

A78-2333-01

D200-84-00

I56-1240-02R

24ATR specifications

The System Sensor 24ATR is a reliable and highly advanced smoke detector designed for commercial and industrial applications. This innovative device combines a range of features, technologies, and characteristics that ensure efficient smoke detection, enhancing safety and protection in various environments.

One of the standout features of the 24ATR is its use of dual-sensor technology. This integration of both ionization and photoelectric sensors allows the unit to respond more effectively to different types of fires. Ionization sensors are particularly responsive to flaming fires, while photoelectric sensors excel in detecting smoldering fires. This dual capability enables the 24ATR to provide comprehensive detection, reducing false alarms and improving overall safety.

The System Sensor 24ATR also incorporates advanced signal processing algorithms. These algorithms analyze sensor data in real-time, allowing for quicker and more accurate detection of smoke particles. This feature enhances the unit's ability to discern genuine threats from non-threatening sources like cooking fumes or dust, which are common triggers for nuisance alarms.

Another significant advantage of the 24ATR is its built-in sounder. This sounder emits an audible alarm when smoke is detected, ensuring that occupants are promptly alerted in the event of an emergency. The volume and tone of the sound are adjustable, allowing customization according to specific environmental needs, making it adaptable for various settings.

Moreover, the 24ATR is designed with ease of installation and maintenance in mind. The device is compatible with various mounting options and can easily integrate into existing fire alarm systems. Additionally, the unit's low profile and sleek design make it aesthetically pleasing, ensuring that safety features do not compromise the look of a facility.

The robustness of the System Sensor 24ATR extends to its durability in harsh environments. It is built to withstand a range of temperatures and humidity levels, ensuring reliable performance under different conditions. The detector is also equipped with a sealed housing to prevent dust and dirt intrusion, which can impair sensor functionality.

In summary, the System Sensor 24ATR stands as an exemplary smoke detection solution, featuring dual-sensor technology, advanced signal processing, an integrated sounder, ease of installation, and durable construction. With these attributes, it is an ideal choice for ensuring safety in commercial and industrial environments, providing peace of mind to building owners and occupants alike.