The OFS 2000F is specially developed for refinery flare stack applications where increased velocity scale, wider temperature range and quick response time are necessary.

OSI’s optical scintillation technology provides the most accurate, path-averaged air velocity measurements of any flare gas sensor. Its superiority has been proven again and again, in flare, air-assisted flare and SRU (Sulfur Recovery Unit) installations worldwide.

  • Full cross-stack/duct measurement for superior accuracy
  • Unaffected by distance & pressure, moisture or opacity
  • Conforms to EPA 40 C.F.R. Part 60 Subpart Ja.
  • Non-intrusive; nothing in flow path
  • No flow media high-temperature limits
  • No calibration necessary
  • Accurate at low velocity and ambient temperature
  • Installs in short runs – two dia. upstream, one dia. downstream
  • Built in continuous self-test diagnostics

Measurement Technique: Optical scintillation

Dynamic range: 0.03m to 100m/sec, bidirectional

Accuracy (absolute): +/- 0.01m/sec basic -or- <2% of reading, whichever is greater

Repeatability (relative): +/- 0.01m/sec basic -or- <1% of reading, whichever is greater

Long term drift: < 1% per year

Response time: (user selectable) three seconds to 600 seconds

Stack/Duct/Pipe diameter: 0.3mto 10m, standard, consult OSI for other ranges

Media Temp/Pressure/Humidity: No effect on measurement

Media transparency: Up to 95% opacity

Ambient Temperature/Humidity: -40°C to 60°C (-40°F to 140°F) / 0%-100% condensing

Data output: 4-20mA and/or RS-232 ASCII serial I/O

Operating temperature range: -40°F to 140°F (-40°C to 100°C)

Humidity: 0% to 100%, Condensing

Dust intrusion: IP65

Mounting flange: 9in Dia. ANSI (150# 4in bolt pattern )