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D-FL 220T Ultrasonic Air Flow Monitor

Brand: Durag

Measuring 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

1 - 3 of 3 Part Numbers
D-FL 220T BW MOUNTING BRACKET
D-FL 220T BW MOUNTING BRACKET
  • Product - D-FL 220T BW Mounting Bracket
D-FL 220T M SENSOR
D-FL 220T M SENSOR
  • Product - D-FL 220T M Sensor
D-TB 100T TERMINAL BOX
D-TB 100T TERMINAL BOX
  • Product - D-TB 100T Terminal Box
1 - 3 of 3 Part Numbers

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)

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