Terms
The OFS-2000F was designed specifically for Flares stack sand reports flow velocities from 0.03 - 170 m/sec with a ± 2% accuracy.

OSi's patented Optical Flow Sensor (OFS) makes drift-free measurements across the entire stack, duct or pipe diameter and calculates an accurate average flow reading. ItMore
Unit of Measure

Advantages

Advantages
  • Cross stack/duct/pipe line measurement for more accurate flow readings.
  • Non-interfering; nothing in flow path.
  • Easy installation and optical alignment.
  • Great for J, Ja and Air-assist/Steam-assist.
  • Minimal upstream/downstream diameters; typically 2 & 1, not 20 & 10 like others.
  • Long-term reliability: no blowers or moving parts; operates unattended - 24/ 7/365.
  • Ultra-low maintenance design.
  • Rugged; designed for harsh environments.
  • Built in continuous self-test diagnostics.
  • Measurement unaffected by path length & media pressure, moisture & opacity.
  • No flow media high temp limits; sight glass windows provided for isolation from media.
  • Compliant with EPA 40CFR Parts 60 & 75.
  • CE, CSA & UL certified. OSi is ISO-9001.
  • Wide versatility, NIST tested and unbeatable combination of advanced technology, high performance and proven reliability!

OSF-2000F Options

OSF-2000F Options
  • Order Z-Purge Option for Class I Div I/II applications.
  • Standard Control Unit is rack mount; for wall mount, order 1910-301, NEMA4 Option.
  • For custom receiver cable length, order 1910-216-nnn where "nnn" is cable length in feet (max 300).

OSF-2000F Accessories

OSF-2000F Accessories
  • MZ-1179-00 Fiber Optic Modems (FOM) for distances to 1 mile (2 required)
  • MZ-0649-00 Limited Distance Modems (LDM) for distances > 100 feet to 3 miles. (2 required)
  • 1910-804 Laptop DB9 serial communications cable

Flow Performance

Measurement Technique

 Optical Scintillation (OSi Patented)

Dynamic Range

 0.03 to 100 m/sec, bidirectional (higher rates possible on RS-232 port)

Accuracy (Absolute)

 ±0.01 m/sec basic -or- ±2% of reading, whichever is greater

Repeatability (Relative)

 ± 1% of reading

Long Term Drift

 Less than 1% per decade

Response Time

 Response 0.3 sec., Update: 3 sec., Averaging (selectable): 3-600 sec.

Automatic Calibration

 2 or 3 point; user selectable interval -or- on external command

Sensor Health Monitoring

 Continuous self-test of voltages, performance, optics, etc.

Media/Environmental

Stack/Duct/Pipe Diameter (Standard)1 0.2 to 10 m

Media Temperature/Pressure/Humidity

 No effect on measurement

Media Transparency

 Up to 95% opacity (OFS-2000-FW recommended for high opacity)

Ambient Temperature

 -50 to 60 ºC-58 to 140 ºF

Condensing Humidity

 0 to 100 %

Physical Specifications

Light Source

 Eye-safe 670 nm visible red LED, 5 deg. divergence angle

Sensor Head

 9 x 9 x 13 in

Sensor Head Weight

 13 lb

Note for Sensor Head

 With 4 in. scheduled 40 flange extender.
NEMA4 weather resistant.

Control Unit Dimensions: Rack Mount Version (Standard)

 5 x 17 x 20 in

Control Unit Weight: Rack Mount Version (Standard)

 13 lb

Note for Control Unit: Rack Mount Version (Standard)

 For indoor use.

Control Unit Dimensions: NEMA4 Wall Mount (Optional)

 12 x 16 x 10 in

Control Unit Weight: NEMA4 Wall Mount (Optional)

 15 lb

Note for Control Unit: NEMA4 Wall Mount (Optional)

 For outdoor/factory floor use.

Electrical Specifications

User Interface

 RS-232 serial I/O and / or 4-20 mA optically isolated current loop; Also two sets of relay contacts for fault and calibration indication.

Power for Transmit Head

 Universal 100-240 VAC, 50/60 Hz, 12 VA (fused & surge protection)

Power for Control Unit

 Universal 100-240 VAC, 50/60 Hz, 40 VA (fused & surge protection)

Cable between Control Unit and Receive Head

 15 foot standard; to 300 foot optional (shielded, 10 cond., 22 AWG)
  • 1 Consult factory for other ranges.