Siemens FDF241 Infrared Flame Detector

1. Overview of Flame Detection Technologies

Different types of flame detectors work by sensing the radiation from flames. These include infrared (IR), ultraviolet (UV), and UV/IR flame detectors.

The Siemens FDF241 uses infrared detection. This makes it great for places with high UV interference. Ideal where IR radiation is the main sign of a fire.

2. General Description:

The Siemens FDF241 Infrared Flame Detector (FDF241-9) is an exceptionally reliable flame detector. Engineers designed it for advanced fire suppression and detection systems. It meets the requirements of the national standard GB15631-1995 “Point-type Infrared Flame Detectors.”

This IR flame detector uses infrared (IR) sensors and advanced ASAtechnology™. It includes a special fuzzy algorithm, harmonic analyzing, and specific application algorithms. These features help reduce false alarms effectively.

The design of the FDF241 allows it to detect hydrocarbon fires and flames that emit IR radiation. It can also find other fires that emit ultraviolet (UV) and infrared (IR) radiation. This makes it perfect for places where false alarms are a worry.

3. Technical Specifications of Siemens FDF241 Infrared Flame Detector

l Model: FDF241 / FDF241-9

l Operating Voltage (Addressable Mode) (Normal): 12–33 VDC

l Operating Current (Addressable Mode) (Normal): 0.7 mA

l Operating Voltage (Collective Mode) (Normal): 14–28 VDC

l Operating Current (Collective Mode) (Normal): 0.5 mA

l Maximum Number of Programmable Remote Reaction Indicators (AI) Connected: 2

l Operating Temperature: –35°C to +70°C

l Storage Temperature: –40°C to +75°C

l Humidity (No heavy condensation on the sensor window):

l At T = 25 ± 3°C: ≥95% relative humidity

l At T = 40 ± 2°C: 93% relative humidity

l Communication Protocol: FDnet or Collective Mode

l Wiring Terminal: 0.2–1.5 mm²

l Dimensions: 135 × 135 × 77 mm

l Colour: Pure White (RAL9010)

l Protection Rating: IP67

4. Features of Siemens FDF241 Infrared Flame Detector

A. The FDF241 infrared flame detector is equipped with three sensors for precise IR flame detection.

B. Two infrared sensors detect light at different wavelengths (4…4.8 μm and 5.1…6 μm).

C. A third IR sensor enhances resistance to sunlight interference (0.7…1.1 μm).

D. Strong resistance to electromagnetic interference, thermal radiation, moisture, and corrosion.

E. Wide viewing angle (minimum 90°) for comprehensive coverage.

F. Signal processing based on ASAtechnology™ ensures high sensitivity and false alarm rejection.

G. Built-in short-circuit isolator for reliable system operation.

5. Suitable Applications

The Siemens FDF241 infrared flame detector is ideal for both indoor and outdoor applications. People commonly use it in fire suppression systems and industrial plants. It helps in places where hydrocarbon fires, gas fires, or smoke-free fires may happen.

It effectively detects fires that emit IR radiation from materials like wood, plastics, gas, and oil. It can also find red flames and invisible flames from flammable liquids and gases.

The fdf241 9 flame detector from Siemens works well with UV/IR flame detectors. It provides better detection reliability for UV and IR light. This reduces false alarms and improves response accuracy.

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