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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. |
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- 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 transfer
- per 4-20mA analog signal and 2 relays
- per RS 485 bus via MODBUS RTU protocol - minimized spare requirements
- extremely low maintenance
- Applications
- Technical Data
- Downloads
- road tunnels
- railway tunnels
suitable for flow measurement in
- to monitor the air flow speed
- to allow control of flow speed in case of fire
provides signals for ventilation control system
| D-FL 220T Application 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 |
| 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 |
| D-FL 220T Technical data | |
| 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 | (0) 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 |
| D-FL 220T M measuring head | |
| ambient temperature | -25 to 55°C |
| MTBF | >170.000 h within service life if used within specifications |
| measurement output | 1x 4-20mA, 400 Ohm, isolated, can be assigned by any measured component and output range 1 x RS 485 Modbus RTU, bi-directional to control room |
| status output | 1x failure, relay NC 1x flow direction, relay NC max. load: 48V, 0,5A |
| signal transfer | 1x Intercom RS 485 Master-Slave communication |
| service interface | USB 1.1 |
| service software | D-ESI 100, requires laptop with Windows XP ™ OS |
| check cycle | internal automated routines, self test |
| power supply | 24 VDC +- 10%, ca. 1 A |
| protection | IP 67 |
| dimensions (h x w x d) | 270 x 130 x 95 mm |
| weight | 2,2 kg |
| material | 1.4571/316Ti, polyamide, ca. RAL5017 fire class: B1 (UL 94 V0) |
| protection | D-FL 220T BW Mounting bracket |
| weight | ca. 1,5 kg |
| material | 1.4571 / 316Ti |
| fixation | 4x bolt, od= 8 to 10mm |
| D-TB 100T A terminal box | |
| ambient temperature | -25 to 55°C |
| power supply | 90 - 264 VAC, 48 - 62 Hz, 30 VA includes 24VDC supply for D-FL 220T |
| dimensions (h x w x d) | 9 ca. 160 x 160 x 110 mm |
| protection | IP 66 |
| weight | ca. 1,5 kg |
| material | polycarbonate, ca. RAL 7035 fire class: B1 (UL 94 V0) |
| fixation | 4 x bolt od= 8 to 10 mm |
| remarks | * variants Subject to technical modifications! |
