The OFS-2000 is OSI’s original patented and unequalled stack/duct flow velocity sensor for Continuous Emissions Monitoring Systems (CEMS).

The OFS uses EPA, approved Method 14 optical scintillation technology. Optical scintillation technique uses advanced Digital Signal Processing (DSP) electronics to measure the movement of turbulence found in a gaseous flow stream to provide highly accurate, path-averaged air velocity measurements. OFS accuracy has been proven by US National Institute of Standards (NIST) and at customer sites worldwide.

  • Full cross-stack/duct measurement for superior accuracy
  • Unaffected by distance and pressure, moisture or opacity
  • Non-intrusive, nothing in the flow path
  • No flow media high-temperature limits
  • No calibration necessary
  • Built in continuous self-test diagnostics
  • Easy installation and alignment
  • No moving parts: operates unattended – 24/7/365
  • Rugged ultra-low maintenance design for harsh environments

Measurement technique: Optical scintillation

Velocity Range: 0.1m to 40m/s velocity

Path length: 0.3m to 10m standard (Consult OSI for other ranges)

Accuracy: 2% of reading

Resolution: 0.1m/s

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

Long Term Drift: <1% >per year

Media temperature: No upper limit (for temp < 150°F an activator heater may be required)

Light source: 670nm red LED

Power requirements: 100-240VAC, 50/60Hz (Transmitter 12VA, Control Enclosure 40VA)

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

Operating temperature range: -40° to 140°F (-40° to 60°C)

Humidity: up to 100%, Condensing

Dust intrusion: IP65

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