System Sensor 2451TH specifications Specifications, Before Installing, General Description

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INSTALLATION AND MAINTENANCE INSTRUCTIONS

2451 and 2451TH Photoelectronic Plug-in Smoke Detectors

3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 www.systemsensor.com

Specifications

 

Size

 

Height:

2.4 inches (61 cm)

 

Add 0.5 inches (13 cm) for thermal model 2451TH

Diameter:

4.0 inches (101 cm)

Weight:

0.5 lb. (277 g)

Operating Temperature Range:

0°C to 49°C (32°F to 120°F)

Operating Humidity Range:

10% to 93% Relative Humidity

Maximum Air Velocity:

3000 Ft./Min. (15 M/S)

Locking Alarm:

Reset by momentary power interruption

Fixed Temperature Thermal:

135°F (57°C)

 

 

Before Installing

Please thoroughly read the System Sensor publication, A05-1003, Applications Guide for System Smoke Detectors, which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this guide are available at no charge from System Sensor. (For installations in Canada, refer to CAN4-S524, Standard for the Installation of Fire Alarm Systems and CEC Part 1, Sec. 32.)

NOTICE: This manual should be left with the owner/user of this equipment.

IMPORTANT: This sensor must be tested and maintained regularly following NFPA 72 requirements. This sensor should be cleaned at least once a year.

General Description

The 2451 photoelectronic detectors utilize state-of-the-art, optical sensing chambers. These detectors are designed to provide open area protection, and to be used with compat- ible UL-listed control panels only. Model 2451TH has the same specifications as Model 2451, with the addition of a built-in fixed temperature (135°F–57°C) thermal detec- tion unit. The capability of plugging these detectors into a variety of special bases makes them more versatile than equivalent direct-wired models.

Two LEDs on each detector light to provide a local 360° visible alarm indication. They flash every ten seconds indi- cating that power is applied and the detector is operating properly. The LEDs light continuously in alarm. Remote LED annunciator capability is available as an optional accessory. These detectors also have the Latching Alarm feature. The alarm can be reset only by a momentary power interruption. These detectors may be tested by activating the internal reed switch with a magnet, or by inserting a calibrated test card in a test slot after removing the detec- tor cover.

The 2451 has been approved for marine use in dry locations by Underwriters Laboratory, Inc. The detector is to be used in dry interior locations only.

Base Selection and Wiring Guide

Refer to the installation instructions for the Plug-in Detector Bases for base selection and wiring instructions. System Sensor has a variety of detector bases available for this smoke detector. This includes 2-wire applications with and without relays and/or current limiting resistors, 4-wire and 120VAC applications. (Note: the 120VAC detector base is not available in Canada.)

All bases are provided with screw terminals for power, ground, remote annunciator connections and relay contact connections, if applicable. The electrical ratings for each detector-base combination are also included in the base installation instructions.

D400-02-01

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I56-277-10R

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Contents Before Installing SpecificationsBase Selection and Wiring Guide General DescriptionBottom and side views showing position of test magnet InstallationTesting Three-Year Limited Warranty Maintenance

2451TH, 2451, 2451TH specifications

The System Sensor 2451TH and 2451 model series represent a significant advancement in the realm of smoke detection technology. Designed with an emphasis on both reliability and performance, these devices are a staple in the monitoring of environment safety in commercial and industrial settings.

One of the main features of the 2451TH model is its dual sensitivity smoke detection capability. The device utilizes both photoelectric and ionization sensing technologies, allowing it to accurately detect a wide range of smoke particles from both fast-flaming and smoldering fires. This dual approach enhances its ability to respond quickly and effectively in diverse fire scenarios, ensuring optimal safety.

In addition to smoke detection, the 2451TH is equipped with a built-in heat sensor that significantly increases its performance when dealing with fire-related incidents. This feature allows the system to not only detect smoke but also rising temperatures in its environment, ensuring rapid alerting before potential threats escalate.

Both the 2451 and 2451TH models are designed to incorporate advanced communication capabilities. They can seamlessly integrate into alarm systems, providing alerts and status updates directly to central monitoring stations. This technology ensures that response teams can act swiftly and as required.

The 2451 series also stands out due to its user-centric design. Installation and maintenance are simplified through features like a removable cover for easy access, as well as a range of compatibility with different mounting options. The devices are also equipped with intelligent software that helps reduce false alarms while maintaining reliability, making them ideal for locations where nuisance alarms could lead to operational difficulties.

Furthermore, the 2451 and 2451TH models are compliant with numerous safety regulations, which bolsters their credibility. They are suitable for a variety of applications, ranging from educational facilities, healthcare institutions, to large corporate offices.

In summary, the System Sensor 2451TH and 2451 smoke detectors are defined by their advanced smoke and heat detection capabilities, user-friendly installation features, and robust communication technologies. These characteristics make them essential tools for fire safety, safeguarding people and property through their innovative design and reliable performance. The continuous improvements and updates to the technology ensure that they remain at the forefront of fire detection solutions.