D-R 220T
Visibility monitor
Visibility Monitor for road tunnels using optical transmission principle. Sensor for ventilation control system or fire alarm system. Reliable measurement parallel to the tunnel axis.
Overview
- measurement parallel to tunnel axis, continuous measurement
- measurement along a distance of 10m, no spot measurement
- corrosion resistant against tunnel atmosphere
- determination and correction of the pollution of optical surfaces
- measuring head and reflector can be exchanged quickly N
– no tools required
– no re-alignment required - signal transfer
– per analog signal and relay outputs
– per RS485 Modbus RTU - hermetically sealed housing - no gas diffusion to optics or electronics
- dust protection tube prevents contamination of the optics
- long maintenance intervals
- quick and easy startup with or without PC
Your benefit
- Precise visibility monitoring
Transmission principle with compensation of pollution of the optical surfaces allows stable and precise measurement of the visibility - 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
Use of durable components 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-tunnels
Long-standing experience in various tunnel applications
Applications
suitable to measure visibility
- in road tunnels
- in factories
suitable for early fire detection
- in road tunnels
suitable to measure dust concentration
- in factories
Technical Data
| sample gas | air 0 - 95 % rel. humidity (not condensing) |
| measurements | extinction coefficient K in km-1 opacity as an option |
| extinction coefficient K [km-1] (typically) | 0 - 15 km-1 |
| measuring path | distance measuring head - reflector: 9.5-11m, path length 19-22m orientation parallel to tunnel axis, |
| ambient temperature | -20 to +50 °C, dT/t < 10°C/h |
| measuring principle | measuring the optical transmission of visible light which passed a measuring path twice |
| light source | LED White, 530 nm |
| measuring ranges | 0 - 15 (...150) km-1 K extinction coefficient 0 - 97,5 % opacity |
| output range | any interval of any measured value can be assigned to analog output, for example extinction coefficient K in km-1 opacity in % Modbus RTU allows access to the a.m. values |
| measurement outputs | 1 x 4-20mA, 400 Ohm, isolated 1 x RS 485 Modbus RTU |
| status output | 2 x relay NO, programmable, max load 48V, 0,5A |
| service interface | USB |
| service software | D-ESI 100 |
| power supply | 24 VDC, +- 10%, 0,4A |
| protection | IP 65 |
| dimensions (h x w x d) | ca. 150 x 220 x 140 mm |
| weight | ca. 2,7 kg |
| material | polyamide, ca. RAL5017 fire class: B1 (UL 94 V0) |
| type | optical retroreflector, optimized for 9.5 to 11m distance to measuring head |
| protection | IP 65 |
| dimensions (h x w x d) | ca. 150 x 110 x 140 mm |
| weight | ca. 1,6 kg |
| material | polyamide, ca. RAL5017 fire class: B1 (UL 94 V0) |
| dimensions (h x w x d) | ca. 280 x 110 x 110 mm |
| weight | ca. 3 kg |
| material | 1.4571 |
| dimensions (h x w x d) | 160 x 280 x 190 mm |
| weight | 4 kg |
| material | 1.4571 |
| fixation | 4x bolt d= 8 to 10mm |
| power supply | 90 - 264 VAC, 48 - 62 Hz, 30 VA includes 24VDC supply for D-R 220T M |
| dimensions (h x w x d) | ca. 160 x 160 x 110 mm |
| ambient temperature | -25 to 55°C |
| 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 |
* variants Subject to technical modifications!
Accessories
Universal display and operating units
The universal operating unit 
D-ISC 100 allows the connection of several DURAG devices. It allows parameterisation and maintenance of all connected devices via integrated keypad or a connected PC and also supports remote access via intranet or internet connection.
Our D-ESI Service and Parameterisation Software assists you to manage all your DURAG sensors connected in one network system via a uniform graphical Interface.
Please contact your sales representitive for more Information.
Supply unit
- D-TB x00 in various versions
- for voltage supply of one DURAG sensor
- different housings available
Please contact your sales representitive for more information.
We offer various accessories such as weather protection covers for your sensor, mounting flanges and so on to fit your application and to have all components from one source.
Please contact your sales representative for further information.