OSI - Model OFS-2000F -Optical Flow Sensor (OFS) for Flares
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. 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.
Housed in a rugged package to cope with hazardous or explosive environments, OFS 2000F is capable of measuring flow velocity as from 0.03 to 170 m/sec across distances from 0.2 to 12 meters with 5000/1 turndown ratio.
Flexible Installation
OFS can install in tight spaces with minimum space requirements of 2 upstream / 1 downstream diameters.
Installation is based on standard ANSI pattern 4” pipe flange. OFS 2000 can be installed on live process lines using hot tap procedure and gate valves for isolation. No re-piping and no shutdown needed.
OFS 2000 F for Air/Steam –assisted flares
Used in conjunction with OFS 2000 (air flow) model. OFS 2000F can give the user unprecedented control of air assisted flare stacks.
Mass and Volumetric Flow add-ons
OFSS come with two 4-20 inputs allowing user to add temperature and pressure sensors. With added temperature and pressure inputs, OFS 2000 systems are capable of delivering moment-by-moment volumetric flow data, taking any guesswork out of tailoring fuel/air mix for optimum combustion. An easily obtainable plug-in is required for mass flow.
Flexible Communications
All systems are equipped with 4-20mA Current Loop, RS-232/485, ModBus RTU data outputs, and can be configured with Serial port, Limited Distance Modem, and Fiber Optic Interface for any type of PLC, DAS, WAN or LAN.
All OFS 2000 sensors meet or exceed requirements set by the Environmental Protection Agency, and California’s South Coast Air Quality Management District:
- EPA Method 14
- EPA MACT RSR 40 CFR 63.670
- EPA 40 CFR part 60 & 75
- EPA 40 CFR part 60 sub part J & Ja
- SCAQMD rule 1118
- Part 63 RSR
OFS-2000 Certifications: UL 3101-1:1993, CSA C22.2 No. 1010.1:92, IEC 61010:1999
- 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!
- 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
- 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).
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):