Drager Flame 1750 H2 Flame Detector

  • Triple IR sensor
  • Detects hydrogen-based fires
  • Five seconds response time

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The Drager Flame 1750 H2 uses a triple IR sensor to detect hydrogen-based fires, which is highly reliable against false alarms. It maintains good measurement performance even at extreme temperatures.

Fast and safe detection

The Drager Flame 1750 H2 is a certified hydrogen fire detector that can detect 1-meter flames at up to 40 meters distance in just 5 seconds, meeting IEC 61508 requirements for safety integrity according to SIL 2. The flame detector also has HART and RS-485 interfaces and has low energy consumption.

Developed for hydrogen

The Dräger Flame 1750 H2 was specially developed to detect hydrogen fires. Its three IR sensors measure only in the 2 to 4 μm range relevant to hydrogen flames, guaranteeing high performance and a low false alarm rate. Common sources of false alarms, such as hot CO2 or welding work, are no longer a problem.

Robust and durable

The housing is very robust and weatherproof. To protect against icing and fogging, the window can be heated automatically. This allows you to operate the Flame 1750 H2 reliably even under extreme environmental conditions, e.g., temperatures from -60 °C to +85 °C.

Simple verification

The built-in self-test “Advanced Optical Verification” (AOV) automatically checks the electronics and optics of the Flame 1750 H2. The front’s three-colour LED lets you see the device status quickly. Green stands for normal operation, yellow indicates an error and red signals a fire alarm.

Order Information

3724447 Drager Flame 1750 H2, Aluminium, 2 x M25
3724445 Drager Flame 1750 H2, Aluminium, 2 x ¾” NPT
3724446 Drager Flame 1750 H2, Stainless steel, 2 x M25
3724444 Drager Flame 1750 H2, Stainless steel, 2 x ¾” NPT


4209307 Drager FS-5000
3718732 Standard Swivel Mount – 316 Stainless Steel
3701298 Swivel Mount Marine – 316 Stainless Steel
3701303 Density Set Detector – metric
3701299 Sun protection – Flame 1×00/3×00/5×00
3701300 Mounting clamp – 2″ pole
3701301 Mounting clamp – 3″ pole
3701302 Mounting clamp – 4″ pole
3724460 Air Shield – Flame stainless steel (grey)
3724461 Air Shield – Flame aluminium (red)
3724462 Duct Mount – Flame stainless steel
3724463 Adaptor Bracket – Flame stainless steel
3724464 Modem – USB HART Flame
3724465 Charger – Flame Simulator FS-5000
3724466 Converter – USB to RS485 Flame

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Title Size
Flame 1750 Datasheet 144 KB

Additional information

Weight 0.09 kg


Dräger Flame 1750 H2
Type Explosion-proof IR flame detector
Spectral range Three wavelengths in the range from 2 μm to 4 μm
Field of view Horizontal 90°, vertical 90°
Response time 4 seconds (typical)
Sensitivity settings Standard (30 m) and High (40 m)
Measuring range* Hydrogen 40 m (131 ft)
N-Heptane 12 m (30 ft)
Methane 30 m (100 ft)
*Fire pan 0.1 m² (1ft²), flare 0.6 m (3 ft)
Electrical data
Relay Alarm and fault
Signal output 0 to 20 mA
Communication RS485, HART® 7
Supply voltage 24 VDC nominal (18 to 32 VDC)
Power consumption Minimum 3 W / Maximum 12 W with heating
Material Aluminium or stainless steel, powder-coated
Cable gland Dual M25 or ¾”NPT
Weight 2.5 kg (5.5 lbs.) aluminium or 6 kg (13.2 lbs.) stainless steel
Protection class IP66, NEMA 4X
Environmental conditions
Temperature -60 to +85 °C (-76 to +185 °F)
ATEX Ex II 2 G Ex db IIC T4 Gb IP66
IECEx Ex II 2 G Ex db IIC T4 Gb IP66
FM/FMC Class 1 Zone 1 AEx db IIC T4
Class 1 Div. 1, Groups B, C, D T4
EAC TR CU Requested
CCCF Requested
INMETRO, PESO, etc. On request
Functional Safety SIL2 (IEC 61508-1-3)
Certificate of conformity of the measuring functionality EN 54-10 (VdS)

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