The D-FL 220T continuously measures flow velocity and flow direction in tunnels. Its ultrasonic sensors provide reliable measurement across the tunnel profile for tunnel ventilation control systems.
Two identical sensors alternately transmit and receive ultrasonic pulses. The system evaluates the transition times dependent on direction and calculates flow speed.
Signals for ventilation control system
|Measuring path||1.2 – 25 m|
|Orientation of measuring path||30 – 60°C to tunnel axis, typically 45°|
|Response time||> 1s … 180s, programmable|
accuracy depends on: installation, path length, flow profile,
typ. < +- 0,2m/s bei 3m/s
|orientation of measuring path||30 – 60°C to tunnel axis, typically 45°|
|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|
|Standards conformity||EN 61 326-1 (2006)
EN 61 010-1 (2001)
ASTRA guideline ventilation of road tunnels – 2008, V2.01
RVS 09.02.22 2007
|Dimensions||270 x 130 x 95 mm|
|Material||1.4571/316Ti, polyamide, ca. RAL5017
fire class: B1 (UL 94 V0)
|Weight||ca. 1.5 kg/td>|
|Fixation||4x bolt, od= 8 to 10mm|
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