Description

The System Sensor 2251T is a smoke detector designed for compatible fire alarm systems. It combines dependable smoke detection with an integrated fixed-temperature heat sensor, making it suitable for a wide range of fire alarm applications.

The detector features automatic sensitivity monitoring, rotary decimal addressing, dual status LEDs, and a low-profile plug-in design that simplifies installation and maintenance. This product is intended for fire alarm installations.

Product Functions

• Detects airborne smoke
• Detects fixed-temperature heat conditions
• Reports fire alarm conditions
• Monitors detector sensitivity
• Supports automatic maintenance supervision
• Plug-in detector installation
• LED status indication

Electrical & System Information

The 2251T operates on compatible signaling line circuits with an operating voltage range of 15–32 VDC. Rotary decimal switches allow simple device addressing, while the connected fire alarm control panel continuously supervises detector status and sensitivity.

The detector includes a fixed 135°F (57.2°C) electronic thermistor and supports optional remote LED annunciation.

Features

• Smoke detection
• Integrated fixed-temperature heat sensor
• 135°F (57.2°C) heat rating
• Automatic sensitivity supervision
• Rotary decimal addressing
• Dual status LEDs
• Plug-in detector head
• Low-profile housing
• Remote LED support
• Indoor application

Mounting & Design

The 2251T installs on compatible System Sensor detector bases including B210LP, B501, B224RB, B224BI, B501BH, and B501BHT. The removable detector head allows convenient inspection, testing, cleaning, and replacement without disturbing field wiring.

Protection & Applications

Suitable for:

• Office Buildings
• Schools
• Hospitals
• Hotels
• Warehouses
• Industrial Facilities
• Government Buildings
• Retail Centers
• Properties

Compatibility

Compatible with:

• System Sensor Fire Alarm Control Panels
• Compatible Signaling Line Circuits
• B210LP Detector Base
• B501 Detector Base
• B224RB Relay Base
• B224BI Isolator Base
• B501BH Sounder Base
• B501BHT Sounder Base
• RA400Z Remote LED Annunciator

Always verify compatibility with the installed fire alarm control panel and detector base before installation.

Technical Specifications

Manufacturer: System Sensor

Parent Company: Honeywell

Model: 2251T

Product Type: Smoke Detector

Smoke Detection: Smoke Sensing Chamber

Integrated Heat Sensor: Fixed Temperature Electronic Thermistor

Fixed Heat Rating: 135°F (57.2°C)

Operating Voltage: 15–32 VDC

Typical Standby Current: 300 µA @ 24 VDC

Maximum Alarm Current: 6.5 mA @ 24 VDC

Operating Temperature: 32°F to 100°F (0°C to 38°C)

Operating Humidity: 10%–93% RH Non-Condensing

Status Indicators: Dual LEDs

Addressing: Rotary Decimal Switches

Mounting: Compatible System Sensor Detector Bases

Remote LED Support: RA400Z

Application: Indoor Fire Alarm Systems

Listings: UL Listed, ULC Listed, FM Approved (application dependent).

Applications

The System Sensor 2251T is designed for fire alarm systems requiring dependable smoke detection with integrated fixed-temperature thermal protection. It is commonly installed in offices, schools, hospitals, hotels, warehouses, industrial facilities, retail buildings, and other occupancies using compatible System Sensor fire alarm equipment.

2251T Datasheet