Call us : 1.866.416.0516

Call us : 1.866.416.0516

DURAG

D-FL 220T Ultrasonic Flow Velocity Monitor

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.

Description

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.


Overview

  • stand-alone system, no control unit required
  • simple configuration
  • corrosion resistant against aggressive tunnel atmosphere
  • sensors can be replaced quickly, no tools, no re-alignment required
  • signal transmission
    – per 4-20mA analog signal and 2 relays
    – per RS 485 bus via MODBUS RTU protocol
  • minimized spare requirements
  • extremely low maintenance

Your Benefit

  • Precise Air Speed and Volume flow Monitoring
    Ultrasonic technology allows precise measurement of the average air flow along the whole tunnel cross section
  • Easy system setup and autonomous Operation
    Measuring device does not require an additional operation unit. Measuring devices can be replaced quickly with no tools or re-alignment required
  • Long Lifetime and extremely low maintenance requirements
    No consumables and no moving parts stand for low maintenance costs and a long Lifetime
  • Robust Design for a wide range of environmental conditions
    High-quality, corrosion-free plastic housing and a wide ambient temperature range
  • Easy connection due to configurable interfaces
    Connection to tunnel control system either via freely adjustable analogue output, relay or RS-485 Modbus RTU
  • Field-tested in road- and railway-tunnels
    Long-standing experience in various tunnel applications including high-speed railway tunnels

Applications

suitable for flow measurement in

  • road tunnels
  • railway tunnels

provides signals for ventilation control system

  • to monitor the air flow speed
  • to allow control of flow speed in case of fire

Technical Data

measurements flow speed, flow rate
flow direction
temperature
sample gas air
flow velocity -20 .. 20 / -10 .. 10 / 0 .. 10 / 0 .. 20 m/s
sample gas moisture 0 – 100% relative humidity
ambient temperature -25 to 55 °C (system)
-40 to 70 °C (sensor)
conformity EN 61 326-1 (2006)
EN 61 010-1 (2001)
RABT 2006
ASTRA guideline ventilation of road tunnels – 2008, V2.01
RVS 09.02.22 2007
remarks corrosion resistant against agressive gases, withstands lavation process in tunnels

measuring principle evaluation of transition times of ultrasonic pulses dependant on direction and subsequent calculation of flow speed
measuring path 1.2 – 25 m
orientation of measuring path 30 – 60°C to tunnel axis, typically 45°
measuring range -40 to 40 m/s
any interval can be assigned to analog output
default: 0-20 m/s
response time > 1s … 180s, programmable
resolution 0,1 m/s,
accuracy depends on: installation, path length, flow profile,
typ. < +- 0,2m/s bei 3m/s

measuring principle evaluation of transition times of ultrasonic pulses dependant on direction and subsequent calculation of flow speed
measuring path 1.2 – 25 m
orientation of measuring path 30 – 60°C to tunnel axis, typically 45°
measuring range -40 to 40 m/s
any interval can be assigned to analog output
default: 0-20 m/s
response time > 1s … 180s, programmable
resolution 0,1 m/s,
accuracy depends on: installation, path length, flow profile,
typ. < +- 0,2m/s bei 3m/s

weight ca. 1,5 kg
material 1.4571 / 316Ti
fixation 4x bolt, od= 8 to 10mm

Go to Top