Terms
The OFS-2000 has a range of 0-40m/sec and is the only flow sensor that gives a true non-contracting cross-stack flow measurement of the process.

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

Advantages

Advantages
  • Cross stack/duct/pipe line measurement for more accurate flow readings.
  • Measurement path 90º to stack; second plat-form not required - save $100K or more
  • Easily replaces existing ultrasonic sensors.
  • Non-interfering; nothing in flow path.
  • Easy installation and optical alignment.
  • 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 temperature limits.
  • Compliant with EPA 40CFR Parts 60 & 75.
  • Wide versatility, NIST tested and unbeatable combination of advanced technology, high performance and proven reliability!

OFS-2000 Options

OFS-2000 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).

Specifications

OFS-2000 Accessories
  • 1910-431-nn Sight Glass with gaskets for media isolation (2 required, multiple models)
  • For custom receiver cable length, order 1910-216-nnn where "nnn" is cable length in feet (max 300).
  • Standard Control Unit is rack mount; for wall mount, order 1910-301, NEMA4 Option.

Flow Performance

Measurement Technique

 Optical Scintillation (OSi Patented)

Dynamic Range

 0.1 to 40 m/sec

Accuracy (Absolute)

 ±0.1 m/sec basic -or- ±2% of reading, whichever is greater

Repeatability (Relative)

 ± 0.1 m/sec basic -or- ±1% of reading, whichever is greater

Long Term Drift

 Less than 1% per year

Response Time

 3 to 600 seconds, user selectable

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 0.3 to 10 m

Media Temperature/Pressure/Humidity

 No effect on measurement

Media Transparency

 Up to 95% opacity (OFS-2000-W is 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.

Purge Air for Heads

 Normally not needed. 1-2 CFM max for some very dirty applications

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.