QUASAR 900 Series Open Path Gas Detector for Hydrocarbons

  • Detects gaseous hydrocarbons such as methane, propane and ethylene
  • Detection range from 7 meters to 200 meters (23 to 600 feet)
  • Built-in event recorder captures last 100 events and alarms
  • 3 year warranty; 10 years on strobe source
  • Suitable for use in SIL-2 safety systems per IEC61508
  • Outputs include 4-20mA, MODBUS, HART
  • Over 100,000 hours MTBF
  • Heated optics for reliable use in harsh environments
  • Totally immune to false alarms from lightning, welding, sunlight
  • 316 stainless steel housing
  • Performance tested to EN60079-29-4


The Spectrex SafEye Quasar 900 is an open path detection system which provides continuous monitoring for combustible hydrocarbon gases. It employs “spectral fingerprint” analysis of the atmosphere using the Differential Optical Absorption Spectroscopy (DOAS) technique.

The Quasar 900 consists of a Xenon Flash infrared transmitter and infrared receiver, separated over a line of sight rom 23 ft (7m) up to 660 ft (200m) in extremely harsh environments where dust, fog, rain, snow or vibration can ause a high reduction of signal.

The Quasar 900 transmitter and receiver are both housed in a rugged, stainless steel, ATEX and IECEx approved enclosure. The main enclosure is EExd flameproof with an integral, segregated, EExe increased safety terminal section.