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OSI - Model OFS-2000P - Optical Particulate Mass Flow Sensor
The OFS-2000P Particulate and Flow sensors report Air Flow and a general Particulate loading and percent opacity in virtually any operating condition. 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.
- Cross stack/duct/pipe line measurement for more accurate flow readings.
- Also reports particulate mass emission rate
- 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!
- 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).
- 1910-431-nn Sight Glass w/ gaskets for media isolation (2 required, multiple models)
- 1910-420 Cast Iron Gate Valves for high temperature applications (2 required)
- 1910-804 Laptop DB9 serial communications cable
Flow Performance
- Measurement Technique: Optical Scintillation (OSi Patented)
- Dynamic Range (Velocity): 0.1 to 40 m/s
- Accuracy (Absolute, Velocity): ± 0.1 m/sec basic -or- ± 2% of reading, whichever is greater
- Repeatability (Relative, Velocity): +/- 0.1 m/sec basic -or- +/- 1% of reading, whichever is greater
- Accuracy (Particulate Mass): ±10% of reading
- 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)
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