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.
D-FL 220T Ultrasonic Flow Velocity Monitor
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 |
