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 dependant 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

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

measurementsflow speed, flow rate
flow direction
temperature
sample gasair
flow velocity-20 .. 20 / -10 .. 10 / 0 .. 10 / 0 .. 20 m/s
sample gas moisture0 - 100% relative humidity
ambient temperature-25 to 55 °C
conformityEN 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
remarkscorrosion resistant against agressive gases, withstands lavation process in tunnels
measuring principleevaluation of transition times of ultrasonic pulses dependant on direction and subsequent calculation of flow speed
measuring path1.2 - 25 m
orientation of measuring path30 - 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
resolution0,1 m/s,
accuracy depends on: installation, path length, flow profile,
typ. < +- 0,2m/s bei 3m/s
ambient temperature-25 to 55°C
MTBF> 170.000 h
within service life if used within specifications
measurement output1x 4-20mA, 400 Ohm, isolated, can be assigned by any measured component and output range
1x RS 485 Modbus RTU, bi-directional to control room
status output1x failure, relay NC
1x flow direction, relay NC
max. load: 48V, 0,5A
signal transfer1x Intercom RS 485 Master-Slave communication
service interfaceUSB 1.1
service softwareD-ESI 100, requires laptop with Windows 7 oder 8
check cycleinternal automated routines, self test
power supply24 VDC +- 10%, ca. 1 A
protectionIP 67
dimensions (h x w x d)270 x 130 x 95 mm
weight2,2 kg
material1.4571/316Ti, polyamide, ca. RAL5017
fire class: B1 (UL 94 V0)
weightca. 1,5 kg
material1.4571 / 316Ti
fixation4x bolt, od= 8 to 10mm
ambient temperature-25 to 55°C
power supply90 - 264 VAC, 48 - 62 Hz, 30 VA
includes 24VDC supply for D-FL 220T
dimensions (h x w x d)ca. 160 x 160 x 110 mm
protectionIP 66
weightca. 1,5 kg
materialpolycarbonate, ca. RAL 7035
fire class: B1 (UL 94 V0)
fixation4 x bolt od= 8 to 10 mm

* variants Subject to technical modifications!

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