OSi - Model WSS-300-DS - Tunnel Wind Speed Sensor and Smoke Sensor
From Other Products
OSi's patented Wind Speed and Smoke Sensor (WSS™) makes drift free air flow measurements across the tunnel, calculates true average wind speed, and detects smoke. The WSS-300-DS model is equipped with Automatic Gain Control (AGC) to compensate for variations in opacity caused by particulate matter, smoke, or moisture suspended in tunnel. The WSS-300-DS uses OSi patented 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 tunnel air flow and provides highly accurate, path-averaged wind speed measurements.
Product Details
Unlike ultrasonic flow sensors the WSS-300-DS measures true average wind speed across the tunnel and detects smoke in the optical path. The WSS-300-DS is perfect for tunnel ventilation monitoring and smoke detection.
The WSS-300-DS consists of DSP / multiprocessor - ...
The WSS-300-DS consists of DSP / multiprocessor - based control unit teamed with a set of optical transmit and receive heads. The heads are easily installed on opposite sides of a tunnel above the expected height of vehicles. The transmit head sends a visible diverging light beam directly across and perpendicular to the flow.
The control unit processes the scintillation detec...
The control unit processes the scintillation detected by the receiver, displays the flow data locally and transmits it to a PC, PLC, DAS or other data collection device that accepts a serial data link and/or a 4-20 mA current loop. The control unit can be configured from either the local keypad and display, or from a laptop or portable terminal.
Applications Include traffic tunnels, rail tunnels, and mine tunnels.
Specifications
Performance Specifications
- Measurement Technique: Optical Scintillation (OSi Patented)
- Dynamic Ranqe: ±40 m/s
- Accuracy: ± 0.1 m/s or ± 2% of readinq, whichever is qreater
- Repeatability: ± 0.1 m/s 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 Check: 2 or 3 point; user selectable interval- or- on external command
- Sensor Health Monitoring: Continuous self-test of voltages, performance, optics, etc.
- Smoke Detection: Optical
Environmental
- Tunnel Diameter: 30 - 100 ft standard - - consult factory for other ranges
- Ambient Temperature: -40 to+60 °C (-40 to 140 °F)
- Humidity: 0-100%
Light Source
- Liqht Source: Eye safe visible red LED
- Wave Length: 670 nm
- Divergent angle: 5°
Size
- Transmit Head: 9x9x 13 inches; 13 lbs; NEMA 4X
- Receive Head: 9x9x13 inches; 13 lbs; NEMA 4X
- Control Unit:
- Rack Mount Version (standard): 5 x 17 x 20 inches, 13 lbs. (for indoor use)
- NEMA4 Wall Mount (optional): 12x16x10 inches, 15 lbs. (for outdoor / equipment floor use)
Electrical Specification
- User Interface:
- RS-232 serial I/O and / or 4-20 mA optically isolated current loop
- Relay contacts for fault alarm and calibration check initialization.
- Power for Transmit Head: Universal 100-240 VAC. 50/60 Hz, 12 VA (fused & surge protected)
- Power for Control Unit: Universal 100-240 VAC. 50/60 Hz, 40 VA (fused & surge protected)
- Cable between Control Unit & Receive Head: Up to 300-DS ft (shielded. 10 conductor, 22 AWG)
(Specifications subject to change without notice.)
Applications
Downloads related to this product
Videos related to this product
-
See the Wind (OFS Measurement Principle) - Video
Through use of a collimated laser light source and special camera, it is possible to literally "see" the wind as it moves from right to left. This movement of thermal turbulence eddies is the signal that our optical technology (OFS / LOA) detects and correlates to determine wind speed / flow velocity.
-
OFS Clean Burn for Air-Assist / Steam-Assist Flare Stacks - Video
A short animated explanation of use of the very versatile Optical Flow Sensor (OFS) technology in air-assist and steam-assist flares. (This version has background music and explanation is in the text and animation; a future version will include narration.)
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