Edwards SIGA-DDOS Intelligent Duct Smoke Detector

The Edwards SIGA-DDOS Intelligent Duct Smoke Detector provides advanced photoelectric smoke detection for compatible Edwards Signature Series fire alarm systems. It monitors airflow inside HVAC ducts and identifies smoke conditions using intelligent optical sensing technology. In addition, its compact housing supports installation in locations with limited mounting space.

Intelligent Photoelectric Smoke Detection

The Edwards SIGA-DDOS uses Optica sensing technology to detect smoke particles in HVAC ductwork. A sampling tube directs air from the ventilation system into the detector’s sensing chamber.

The internal processor analyzes optical smoke readings and monitors changes in the surrounding environment. Therefore, the detector can identify developing smoke conditions and communicate with a compatible fire alarm control panel.

This intelligent operation also supports individual device identification and system diagnostics.

Advanced Optica Sensing Technology

The detector combines optical sensing with digital signal processing to improve smoke detection performance.

Its internal algorithms evaluate sensor readings and compensate for gradual environmental changes. As a result, the detector helps maintain consistent sensitivity during normal operation.

Moreover, intelligent compensation can reduce the effects of dust accumulation and changing conditions.

The detector can also report maintenance conditions when its sensing chamber requires attention.

Low-Flow HVAC Smoke Detection

This addressable duct detector supports air velocities from 100 to 4,000 feet per minute.

The broad airflow range makes it suitable for many compatible HVAC applications. Consequently, installers can use the device in both low-flow and higher-velocity ventilation systems.

However, technicians must verify actual duct airflow before installation.

Key Features

• Intelligent addressable duct smoke detector
• Edwards Signature Series compatibility
• Optica photoelectric smoke sensing
• 100–4,000 FPM airflow range
• Intelligent digital signal processing
• Automatic environmental compensation
• Electronic device addressing
• Dirty detector identification
• Automatic diagnostic monitoring
• Magnet-activated testing
• Integrated Form C auxiliary alarm relay
• Remote test station compatibility
• Remote LED indicator support
• Rotatable sampling tube connection
• Compact low-profile housing
• Conformally coated circuit boards
• Accessible smoke sensing chamber
• Suitable for commercial HVAC fire alarm systems

Compact Duct Detector Housing

The Edwards SIGA-DDOS features a compact housing designed for professional HVAC installations.

Its low-profile construction provides convenient mounting in areas with limited clearance. In addition, the detector separates its sensing and control sections to support inspection and maintenance.

The housing also protects sensitive electronic components from normal environmental exposure.

Adjustable Sampling Tube Installation

The detector uses a sampling tube to collect air from the connected duct.

Installers can position the tube according to duct dimensions and airflow direction. Furthermore, the tube supports rotational adjustment for proper alignment.

This flexibility helps technicians configure the detector for different duct arrangements.

The sampling tube is a separate accessory. Therefore, buyers should verify the required tube size before ordering.

Form C Auxiliary Alarm Relay

The detector includes one Form C auxiliary alarm relay.

This relay provides normally open, normally closed, and common connections. As a result, compatible systems can use the output for approved ancillary control functions.

For example, the relay may support HVAC shutdown applications when the system design permits.

However, installers must verify relay ratings and connected equipment requirements before installation.

Remote Testing and Maintenance

The detector supports compatible remote test stations and remote LED indicators.

These accessories allow technicians to access selected testing and status functions from a convenient location. Therefore, maintenance personnel can perform supported procedures without directly reaching the detector housing.

In addition, a magnet-activated test switch supports local functional testing.

Typical Fire Alarm Applications

This intelligent duct smoke detector supports commercial and institutional HVAC fire alarm installations.

For example, compatible applications may include office buildings, schools, healthcare facilities, hotels, warehouses, shopping centers, and industrial properties.

The detector can monitor supply or return ductwork when the installation meets manufacturer requirements.

Installation and Compatibility

Before installation, verify the fire alarm control panel, Signature communication circuit, duct dimensions, airflow, and sampling tube requirements.

Also, confirm the required remote accessories, relay wiring, and mounting location.

Qualified fire alarm professionals should install and test the device. Furthermore, technicians should follow Edwards installation instructions and applicable fire alarm codes.

Overall, this Edwards intelligent duct smoke detector provides reliable optical smoke detection for compatible HVAC systems. Its Optica technology, environmental compensation, flexible sampling tube installation, and integrated relay make it a practical solution for professional fire alarm applications.

SIGA-DDOS Datasheet