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. It is the only flow sensor that gives a true non-contacting cross-stack flow measurement of the process. The OFS uses our EPA Method 14 approved optical scintillation technology. The optical scintillation technique relies on advanced Digital Signal Processing (DSP) electronics to "see" and measure the movement of turbulence found in a gaseous flow stream to provide highly accurate, path-averaged air velocity measurements. The accuracy of the OFS has been proven both in NIST’s wind tunnel and in numerous real-world installations.
Advantages
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OFS-2000P Options
|
OFS-2000P Accessories
|
Flow Performance
|
Media / Environmental
|
Physical Specifications
|
Electrical Specification
Advantages
Advantages |
N/A
|
OFS-2000P Options
OFS-2000P Options |
N/A
|
OFS-2000P Accessories
OFS-2000P Accessories |
N/A
|
Flow Performance
Measurement Technique |
N/A Optical Scintillation (OSi Patented) |
Dynamic Range (velocity) |
N/A 0.1 to 40 m/sec |
Accuracy (absolute, velocity) |
N/A +/- 0.1 m/sec basic -or- +/- 2% of reading, whichever is greater |
Repeatability (relative, velocity) |
N/A +/- 0.1 m/sec basic -or- +/- 1% of reading, whichever is greater |
Accuracy (particulate mass) |
N/A +/-10% of reading |
Long Term Drift |
N/A Less than 1% per year |
Response Time |
N/A 3 to 600 seconds, user selectable |
Automatic Calibration |
N/A 2 or 3 point; user selectable interval -or- on external command |
Sensor Health Monitoring |
N/A Continuous self-test of voltages, performance, optics, etc. |
Media / Environmental
Stack / Duct / Pipe Diameter |
N/A 0.3 to 10 m, standard -- consult factory for other ranges |
Media Temperature / Pressure / Humidity |
N/A No effect on measurement |
Media Transparency |
N/A Up to 95% opacity (OFS-2000-W is recommended for high opacity) |
Ambient Temperature / Humidity |
N/A -50 to 60 C (-58 to 140 F) / 0 - 100% condensing |
Physical Specifications
Light Source |
N/A Eye-safe 670 nm visible red LED, 5 deg. divergence angle |
Sensor Heads (w/ 4” sch.40 flange extender) |
N/A 9 x 9 x 13 inches, 13 lbs. -- NEMA4 weather resistant |
Control Unit: Rack Mount Version (standard) |
N/A 5 x 17 x 20 inches, 13 lbs. (for indoor use) |
Control Unit: NEMA4 Wall Mount (optional) |
N/A 12 x 16 x 10 inches, 15 lbs. (for outdoor / factory floor use) |
Purge Air for Heads |
N/A Normally not needed. 1-2 CFM max for some very dirty applications |
Electrical Specification
User Interface |
N/A 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 |
N/A Universal 100-240 VAC, 50/60 Hz, 12 VA (fused & surge protection) |
Power for Control Unit |
N/A Universal 100-240 VAC, 50/60 Hz, 40 VA (fused & surge protection) |
Cable between Control Unit & Receive Head |
N/A 15 foot standard; to 300 foot optional (shielded, 10 cond., 22 AWG) |