System Sensor 2151 Smoke Detector (Replaces 2451TH)

System Sensor 2151 Photoelectric Low-Profile Plug-In Smoke Detector (Replaces 2451TH)

The System Sensor 2151 is a low-profile photoelectric plug-in smoke detector engineered to provide dependable open-area smoke detection for conventional fire alarm systems. Replacing the 2451TH, the 2151 features an advanced optical sensing chamber that delivers fast, accurate detection of visible smoke particles while helping reduce nuisance alarms caused by dust and environmental contaminants.

Designed for both new installations and replacement projects, the 2151 offers plug-in construction that allows quick installation and maintenance. It is compatible with a wide range of System Sensor mounting bases, providing flexibility for various wiring configurations and applications. Dual LEDs provide 360-degree visibility, flashing during normal operation and latching on in alarm to simplify maintenance and troubleshooting.

Its low-profile design blends seamlessly into commercial and institutional environments while providing reliable smoke detection for offices, schools, healthcare facilities, hotels, and other protected spaces.

Key Features

• Low-profile photoelectric smoke detector

• Replaces the System Sensor 2451TH

• Advanced optical sensing chamber

• Plug-in design for quick installation and maintenance

• Dual LEDs provide 360-degree visibility

• LED flashes during standby and latches during alarm

• Stable performance in high air velocity environments

• Compatible with multiple System Sensor detector bases

• Tamper-resistant base capability

• Remote LED compatibility

• Removable cover for easy cleaning

• UL listed

• Genuine System Sensor smoke detector

Applications

The System Sensor 2151 is ideal for:

• Office buildings

• Schools and universities

• Hospitals and healthcare facilities

• Hotels

• Retail buildings

• Warehouses

• Government buildings

• Commercial facilities

• Conventional fire alarm systems

• Open-area smoke detection

Specifications

• Manufacturer: System Sensor

• Model: 2151

• Product Type: Photoelectric Smoke Detector

• Detection Method: Photoelectric

• Installation: Indoor

• Mounting: Plug-in

• Operating Voltage: 8.5 to 35 VDC

• Standby Current: 120 µA

• Operating Temperature: 32°F to 120°F (0°C to 49°C)

• Operating Humidity: 10% to 93% RH, non-condensing

• Alarm Indication: Dual red LEDs with 360-degree visibility

• Construction: Low-profile housing

• Compatibility: System Sensor conventional detector bases

• Replacement For: 2451TH

• Compliance: UL 268

Why Choose the System Sensor 2151?

The System Sensor 2151 delivers dependable photoelectric smoke detection in a compact, low-profile design that is easy to install and maintain. With its advanced optical sensing chamber, plug-in construction, dual LED indication, and compatibility with multiple System Sensor bases, it provides a reliable and cost-effective solution for protecting commercial and institutional buildings.