Siemens DF1151-Ex Flame Detector

SIEMENS DF1151-Ex Intrinsically Safe Infrared Flame Detector

The Siemens DF1151-Ex (MPN: BPZ:5357820001) is a heavy-duty, intrinsically safe multi-wavelength infrared (IR) flame detector engineered for hazardous marine environments, offshore platforms, and hazardous industrial locations. Operating on the Siemens AlgoRex addressable interactive loop protocol via an approved shunt Zener diode barrier, the unit utilizes dual pyroelectric sensors and a dedicated silicon photodiode coupled with fuzzy logic and wavelet frequency analysis. This design yields fast flame-front detection for carbonaceous fires while maintaining immunity to heavy solar radiation, hot body blackbody emissions, welding arc wash, and offshore electromagnetic interference.

Technical Specifications

Key Features

1. Multi-Spectrum Triple Sensor Optical Engine: Employs two pyroelectric elements and one silicon photodiode to continuously verify the signature CO₂ emission flicker spectrum (4.4 µm) against ambient sunlight (0.7–1.1 µm) and localized thermal background interference (5.1–6.0 µm).
2. Intrinsically Safe Ex ib IIC T4 Construction: Certified under PTB 02 ATEX 2159 for installation directly in Zone 1 and Zone 2 gas hazardous environments without heavy flameproof junction housings.
3. AlgoRex Intelligent Wavelet Signal Processing: Uses patented fuzzy logic algorithms running digital wavelet transforms to separate actual fire flicker frequencies (1–15 Hz) from heavy shipboard machinery vibration, rotating engine parts, or deck flare glare.
4. Internal Short-Circuit Isolation: Includes built-in bidirectional loop isolators compliant with EN 54-17, preserving whole-loop data telemetry during single-point open-circuit or short-circuit cable faults.
5. IP67 Rugged Enclosure: Glass-fiber reinforced structural polymer rated to IP67 repels salt fog, deck-hose spray, aggressive exhaust emissions, and tropical marine air.

Applications

• Vessel Machinery Spaces: Engine rooms, main purifier flats, auxiliary boiler fronts, and emergency generator enclosures.
• Offshore Oil & Gas Assets: FPSO top-side process modules, crude cargo manifold decks, wellhead platforms, and separator bays.
• Liquid Hydrocarbon Storage: Bunker fuel transfer stations, LNG/LPG compressor rooms, and pump house spaces.
• Chemical Processing: Solvent mixing facilities, paint locker stores, and hydrocarbon fuel metering skids.

Part Number Cross-References

• Siemens Ordering Code (MPN): BPZ:5357820001
• Collective System Equivalent: DF1101-Ex (MPN: BPZ:5166750001)
• Standard Non-Ex Addressable Model: DF1192 / DF1191
• Associated Safety Barrier: Siemens SB3 (Intrinsic Safety Barrier)

Frequently Asked Questions

What is the difference between the Siemens DF1151-Ex and the DF1101-Ex?

The DF1151-Ex is an addressable, interactive detector engineered for AlgoRex interactive loops (using line modules like the E3M171). The DF1101-Ex is a conventional/collective detector designed for standard DC conventional fire zones through an appropriate barrier. They are not backward-interchangeable on an interactive addressable loop.

Can the DF1151-Ex be installed outdoors on tanker weather decks?

Yes. The detector holds an IP67 environmental ingress rating. For weather deck and open-sea installations, install the optional DFZ1190 rain and spray hood together with the MWV1 ball-and-socket joint to deflect direct tropical downpours and green water wash.

What tools are needed to test the DF1151-Ex in an explosion-hazard zone?

Always use an intrinsically safe test lamp, such as the Siemens Stabex HF optical test unit (BPZ:4620910001). Conventional open-flame methods or non-certified strobe test wands are strictly prohibited inside Zone 1 and Zone 2 hazardous areas.

Does the DF1151-Ex react to hot exhaust manifolds or sodium vapor lighting?

No. The multi-wavelength design uses optical differential evaluation. The 5.1–6.0 µm reference sensor cancels out static heat and blackbody radiation from hot pipes, while the 0.7–1.1 µm silicon diode filters out lighting frequencies and unmodulated sunlight. Only carbonaceous open flames exhibiting typical flicker rates (1–15 Hz) within the CO₂ combustion band trigger an alarm.