DK7338.221 Rittal EFD III EARLY FIRE DETECTION SYSTEM

Why Choose the Rittal DK 7338.221 EFD III Early Fire Detection System?

The Rittal DK 7338.221 EFD III is a compact early fire detection and aspirating smoke detection system designed specifically for closed, non-accessible server and IT enclosure systems. Installed in a standard 482.6 mm (19-inch) rack and occupying just 1 U, the EFD III provides continuous active monitoring for smoke aerosols to identify developing fires at an early stage.

An integral fan continuously extracts air from the protected enclosure through a pipe system and passes the sampled air across two optical smoke detectors with different sensitivity thresholds. The highly sensitive detector provides a pre-alarm when smoke aerosols are first detected, while the second detector activates the main alarm. Evaluation and control electronics continuously monitor the detectors to ensure correct operation.

The EFD III integrates with professional monitoring infrastructure through floating relay outputs and CAN bus connectivity to the Rittal CMC III monitoring system. Operating from a 100–240 V AC, single-phase, 50/60 Hz supply, the system also provides approximately 4 hours of uninterruptible mains electricity operation, supporting continuous fire monitoring during interruptions to the normal supply.

Key Advantages

• Provides early detection of developing fires inside closed IT and server enclosures.
• Active aspirating smoke detection continuously samples air from the protected enclosure.
• Two optical smoke detectors provide separate pre-alarm and main alarm thresholds.
• Compact 482.6 mm (19-inch), 1 U rack-mount design.
• Integrated CAN bus interface for Rittal CMC III monitoring systems.
• Floating relay outputs enable pre-alarm, main alarm and collective fault signals to be forwarded to higher-level systems.

Key Features

• Rittal EFD III early fire detection system.
• Integrated active smoke extraction system with continuous air sampling.
• High-sensitivity optical smoke detector for pre-alarm detection.
• Second optical smoke detector for the main alarm threshold.
• 482.6 mm (19-inch), 1 U rack mounting.
• 100–240 V AC, single-phase, 50/60 Hz rated operating supply.
• Approximately 4 hours uninterruptible operation.
• Plain-language status display with 6 LED indicators.
• CAN bus connectivity for master-slave networking and CMC III integration.
• Tested by VdS Schadenverhütung GmbH.

Active Early Fire Detection for Server Enclosures

The Rittal EFD III uses active air sampling rather than relying solely on smoke reaching a passive detector. An integrated fan continuously draws air from the protected enclosure through a pipe system, enabling the two optical detectors to monitor the sampled air for smoke aerosols and provide staged alarm signalling.

The highly sensitive detector provides an early pre-alarm at approximately 0.25%/m light obscuration, while the second optical detector provides the main alarm threshold at approximately 3.5%/m light obscuration. Alarm and fault information can be transmitted through floating contacts or integrated with the Rittal CMC III monitoring platform via CAN bus, supporting centralised supervision of critical IT infrastructure.

Typical Applications

• Closed server enclosure systems.
• Data centre server and network cabinets.
• Critical IT infrastructure.
• Telecommunications enclosure systems.
• Industrial IT and communications cabinets.
• 482.6 mm (19-inch) enclosure fire monitoring.