This product Safeye 400 has been superseded by the Quasar 950/960.

UV Open Path (Line Of Sight) Gas Detection System provides sensitive (PPM level) monitoring of Hydrogen Sulfide (H2S), Ammonia and Aromatic gases.

SafEye Model 400 Open Path (line of sight) Gas Detector monitors toxic and aromatic gases at low concentrations over an optical path of up to 330ft (100m). The system has a fast response time of up to 10 seconds.

With its unique flashing light source, SafEye open path gas detector is immune to false alarms, which can be caused by direct or reflected radiation from sunlight, flares, illumination and other "black body" radiation sources.

The SafEye gas detection system can be used in highly sensitive areas to detect low gas concentration levels or in industrial applications where alarm condition is activated only when specific hazardous concentration levels are exceeded.

The SafEye, due to its special optics design, provides for an alignment tolerance of ±1/2° in all directions and is protected against false gas reading and alarms which are caused by partial obscuration and blocking, misalignment, vibration, flexing or tilts.

The SafEye unique flash source gives a very powerful radiation signal (10KW in a flicker frequency of 1-100KHz) for a very short time, less than one millisecond at pre-selected intervals. This patented feature enables the detector to address only the high intensity and ultra fast signals that correspond to fast changes in gas concentration, while ignoring all other background radiation.

An optional RS-485 output provides data communication for a single system or a network (as many as 64 detectors) to a host computer for central monitoring.

The SafEye system contains built-in temperature sensors located in the gas sensor compartment. Each SafEye unit is factory calibrated through the entire operating temperature range. The temperature compensating mechanism allows correct operation in changing and extreme temperatures while maintaining the system’s accuracy. Its internal microprocessor will automatically compensate for low signals with its internal Automatic Gain Control (AGC).



  • Proven Technology

Used in highly sensitive areas to detect low toxic gas (H2S, NH3, Aromatics)  concentration levels to activate alarms measures only when specific hazardous concentration levels are exceeded.

  • Cost Saving

One system can replace several point gas detectors in a straight line of sight, up to 330ft (100m). Low cost of ownership, much lower installation cost!

  • Fast Response

Adjustable light source flash rate gives high sensitivity and extremely fast detection time, up to 10 sec.

  • Harsh Environment

Specially designed to perform under extreme conditions such as high-speed airflows, humidity and corrosive gases where point detectors may not be effective.

  • Low Maintenance

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

  • 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, local and remote diagnostic tools.



  • Petrochemical, pharmaceutical, and other chemical storage and production areas of aromatic hydrocarbons, such as Benzene, Toluene, Xylene, etc.
  • Toxic chemical storage sites and hazardous waste disposal areas.
  • Detection of H2S in desulfurization processes at refineries, oil platforms, pipelines, refueling stations and fuel storage facilities.
  • Transportation depots and shipping warehouses of solvents (aromatic and polymers origin), degreasing and cleaning solvents.
  • Styrene monomer, polymers, plastic industries.
  • Ammonia production facilities, storage and transportation.
  • Air conditioning, refrigeration and agriculture application areas for ammonia and derivatives.
  • Semiconductor industry in which ammonia concentration monitoring is required.



Detected Gases Detection of toxic gases such as hydrogen sulfide (H2S), Ammonia (NH3) and aromatic hydrocarbons such as Benzene, Toluene, Xylene, Styrene, etc.
Detection Range and Response Time
410 411 412 413 414
Distance (m) 1-4 2-8 7-25 15-50 30-100
Response Time 1 sec. 2 sec. 5 sec. 10 sec. 10 sec.
Detected gas H2S H2S H2S H2S H2S
420 421 422 423
Distance (m) 1-4 2-8 7-25 15-50
Response Time 2 sec. 5 sec. 5 sec. 5 sec.
Detected gas Ammonia, Benzene/Xylene, Toluene, CS2
Immunity to False Alarm Is not influenced by solar radiation, hydrocarbon flames and other external IR radiation sources.
Spectral Response 200-300 µm
Sensitivity Range 0-500 PPM.m Standard
0-200 PPM.m by dip-switch setting
Displacement/Misalignment Tolerance ± 1/2˚
Drift Long-term ±5% of full scale
Temperature Range -40˚F (-40˚C) to 131˚F (55˚C)
Power Supply Standard - 24 VDC (18-32 VDC)
Power Consumption Detector:  150mA @ 24 VDC (200 mA Peak)
Source:    100mA @ 24 VDC (220 mA Peak)
Electrical Connection 2 x 3/4˝ - 14NPT conduits or 2 x M25 x 1.5 mm ISO
Electrical Input Protection Complete electrical interface protection against reversed polarity voltage, surges and spikes according to MIL-STD-1275A
Electromagnetic Compatibility EMI/RFI protected CE Marked
Outputs - 4-20mA The 4-20mA current output is source configuration
Resistance Loop 100-600 Ω
Outputs - RS-485 Serial communication for full control with maintenance and trouble shooting facility can be integrated for a network of max 64 detectors
Outputs - Relays
  Type Normal Position Maximum Ratings
Alarm SPDT NO, NC 2A at 30VDC or 0.5 at 250 VAC
Accessory SPST Open 5A at 30VDC or 250VAC
Fault SPST Closed 5A at 30VDC or 250 VAC
ATEX / Cenelec: EX II 2G EExd IIB + H2 T6 (55˚C). EX II 2G EExde IIB + H2 T6 (55˚C).
UL: UL No. - E209870, Class I Groups C and D Hazardous Location
Water and Dust Tight IP66 and 67
NEMA 250 6P
Mechanical Design The standard detector housing is heavy-duty, copper-free (less than 1%) aluminum. The housing is finished in white epoxy enamel and is also available in 316L Stainless Steel upon request.
Environmental Standards Meets MIL-STD-810C for Humidity, Salt & Fog, Vibration, Mechanical shock, High Temp, Low Temp
Dimensions 5.2" (132mm) x 5.2" (132mm) x max. 11" (280mm)
Weight Al. Encl. Detector: max 8.8 lb (4 kg)        Source: max 10.8 lb (4.9 kg)
St. Encl. Detector: max 14.3 lb (6.5 kg)   Source: max 16.7 lb (7.6 kg)




This product Safeye 400 has been superseded by the Quasar 950/960.


Share this