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D-FL 220T Ultrasonic Air Flow Monitor
Brand: DuragMeasuring system for continuous evaluation of flow velocity and flow direction in tunnels.
Ultrasonic sensors for tunnel ventilation control system.
Reliable measurement across the tunnel profile.
Two identical sensors alternately transmit and receive ultrasonic pulses.
The system evaluates the transition times dependent on direction and calculates flow speed.
D-FL 220T requires extremely low maintenance.
Features- Reliable measurement across the tunnel profile
- No separate control unit required
- Easy configuration
- Corrosion resistant
- Sensors can be exchanged very quickly
- no tools required
- no re-alignment required
- Signal transmission by Analogue signal/ relay or by RS 485 MODBUS RTU
- Reduced spare requirements
- Immune against ambient noise
- Extremely low maintenance requirements
Specifications
Brand
Ambient Temperature Range
- -25° to 55° C (-13° to 131° F)
Applications
- Railway Tunnels
- Road Tunnels
- To Allow Control of Flow Speed in Case of Fire
- To Monitor the Air Flow Speed
Approvals & Certifications
- EN 61 326-1 (2006), EN 61 010-1 (2001)
Approvals & Certifications
- 2004/108/EC (EMC Directive)
- 2006/95/EC LVD (Low Voltage Directive (LVD))
Cable Length
- 59” (1.5 metres) Cable with Plug - 2 x D-FL 220T M Sensor
Communication
- Modbus RTU
- RS-485
Diameter
- Fixation at Tunnel Wall: 4 x Bolt Od = 0.314” (8 mm) - D-FL 220T BW Mounting Bracket, D-TB 100T Terminal Box
Electrical Rating
- Status Contacts: 2 A at 48 V (1 x Fault Contact, NC, 1 x Flow Direction NC)
Enclosure Finish
- Painted by RAL5017 - D-FL 220T M Sensor, D-TB 100T Terminal Box
Enclosure, Body Material
- 316Ti Stainless Steel, 1.4542 - D-FL 220T M Sensor, D-FL 220T BW Mounting Bracket
- Polyamide
- Polycarbonate
Environmental Protection
- IP66
- IP67
Humidity
- 0 to 100 % Relative Humidity
Indication
- LED
Interface Connection
- USB 1.1 Port
Measuring Range
- -40 to 40 m/sec (-131.2 to 131.2 feet/sec)
Media
- Air
Mounting
- 316Ti Stainless Steel Wall Mounting Bracket (1.4571) - 2 x D-FL 220T BW
Output
- Signal Transmission: 1 x 4-20 mA, 400 ohms, Isolated
Power Supply
- 24 Vdc ± 10 %, Approximately 1 A
- 90-264 Vac, Approximately 30 VA
Principle of Operation
- Ultrasonic
Resolution
- < ± 0.2 m/sec at 3 m/sec
- 0.1 m/sec
Response Time
- 1 to 180 seconds
Rotation
- Orientation of Measuring Path: Direction of Tunnel Axis, Typically 45°
Temperature Range
- 30° to 60° C (86° to 140° F)