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Spectrex SafEye 300 Duct Open Path Detector

Part Number: SafEye-300

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The SafEye 300 Duct Open Path Detectors monitor ingress of hazardous flammable gas concentrations into air intakes of turbine engines and HVAC air ducts. Duct applications require that the small path across an air inlet responds with a very high sensitivity, full scale of 1 LEL.m for 2-6.6ft (0.6-2m) wide inlet and full scale of 2.5 LEL.m for 6.6-23ft (2-7m) wide inlet.


High Sensitivity

  • Alarm up to 0.5 LEL.m
  • 5 times more sensitive than the normal Open Path equipment

Fast Response

  • Fast response time of typically 2 sec., max. 5 sec.
  • 5 to 10 times faster than the commonly used Open Path detector and 20-50 times faster than the Point Detector.

Low Maintenance
High reliability, simple installation, alignment, and maintenance, equipment not subject to poisoning.

Proven Technology
Used in air ducts on FPSO’s and offshore rigs for British Petroleum (BP), Shell, and ABB Lummus for turbines, air intakes, etc.

Harsh Environment
Specially designed to perform under extreme conditions such as high-speed airflows, high temperatures (up to 185˚F (85˚ C)), humidity, and corrosive gases, where point detectors may not be effective.

Standard Interface Options
Standard 4-20 mA outputs or RS-485 output to allow networking (up to 64 detectors) to a central monitoring/PC system.
This feature also enables easy maintenance and local and remote diagnostic tools.

Typical Applications

Offshore Oil & Gas Rigs and FPSOs; Onshore Oil & Gas Terminals; Storage Farms and Filling Stations; Petrochemical and Chemical Industries; Power Utilities and Turbines areas; Automotive, Painting, Printing, Pharmaceutical Industries, and many more.

Specific applications include:

  • HVAC ducts (Heating Ventilation Air Conditioning) in accommodations areas
  • Air ducts in process areas
  • Stacks and exhaust towers
  • Compressors and generators enclosures
  • Curing ovens and drying equipment, printing equipment
  • Engine & Turbine air intake and exhaust
  • Air intake to safety enclosures
  • Paint-booths and paint production and drying processes
  • Air ventilation shafts


General Specifications

Detected Gases Simultaneous detection of C1-C8 flammable gases
Detection Range and Response Time
Model 301
Distance 2-11.5ft (0.6-3.5m)
Response Time Typically 2 sec., max. 5 sec.
Immunity to False Alarm Not influenced by solar radiation, hydrocarbon flames, other external IR radiation sources, high airflows and high loaded streams
Spectral Response 3.0-4.0 µm
Sensitivity Range 0-2.5 LEL.m Standard; 0-1 LEL.m by software
Misalignment Tolerance ±2˚
Drift Long-term ±5% of full scale
Temperature Range -40˚F (-40˚C) to 185˚F (85˚ C)

Electrical Specifications

Power Supply 24 VDC (18-32 VDC)
Power Consumption
Detector: 200mA @ 24 VDC (250 mA Peak)
Source: 250mA @ 24 VDC (450 mA Peak)
Electrical Connection 2 x 3/4” – 14NPT conduits
Electrical Input Protection According to MIL-STD-1275B
Electromagnetic Compatibility EMI/RFI protected CE Marked


Sink (source option) configuration
Maximum load 600Ω at 18-32V DC
4-20mA Gas reading
4mA Normal, zero reading
2mA Obscuration/misalignment /beam block
1mA Zero calibration mode
0mA Fault
HART Protocol HART communications on the 0-20mA analog current (FSK)- used for maintenance, configuration changes and asset management
RS-485 The RS-485 input/output provides complete data information to a PC and receives control commands from the PC or handheld unit
Type Normal Position Maximum Ratings
Alarm SPDT NO, NC 2A at 30V DC
Accessory SPST Open 2A at 30V DC
Fault SPST Closed 2A at 30V DC

Mechanical Specifications

Dimensions 5.2″ (132mm) x 5.2″ (132mm) x max. 4.7″ (120mm)
Al. Encl. Detector: max 8.7 lb (3.7 kg) Source: max 8.58 lb (3.9 kg)
Mechanical Design The standard detector housing is heavy-duty, copper-free (less than 1%) aluminum. The housing is finished in white epoxy enamel
Environmental Standards Designed to meet MIL-STD-810C for Humidity, Salt & Fog, Vibration, Mechanical shock, High Temp, Low Temp
Water and Dust Tight IP66 and 67 per EN60529
NEMA 250 6P

Hazardous Area Approvals

FM Class I, Division 1, Groups B, C and D, Dust Ignition proof for Class II, Division 1, Groups E, F and G.
Performance per Class no. 6325
Reliability SIL2 per IEC61508 (TUV)

Product Data Sheet


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