Durag D-R 220T Visibility Monitor

Durag has decided to discontinue the D-R 220 (T) by 31.12.2024 without replacement.
If you still need the D-R 220(T), you can order it until 30.09.2024.
Repairs, delivery of spares and wear and tear parts will be available for up to 5 years after the date of discontinuation.

Alternative product D-R 290 (2. G)

The D-R 290 works according to the transmission principle. The measurement is continuous, non-contact and without sampling in the exhaust gas flow. The D-R 290 is particularly suitable for monitoring medium to high dust concentrations.

For tunnel projects SMART/AQM

Air quality monitor with IoT visible opacity and gas sensor for use in tunnels. Visibility measurement is based on the scattered light principle, gas measurement with up to 3 electrochemical cells.

Download Specifications

Brand

Tunnel & Roads Transport

SPECIFICATIONS

Application
Sample gas Air
0 – 95 % rel. humidity (not condensing)
Measuring ranges 0 – 15 (…150) km-1 K extinction coefficient
0 – 97.5 % opacity (as an option)
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
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

TECHNICAL DATA

D-R 220T M MEASURING HEAD SENDER/RECEIVER UNIT
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
interface USB
power supply 24 VDC, +- 10%, 0.4A
Protection rating IP 65
Dimensions ca. 150 x 220 x 140 mm
Weight ca. 2.7 kg
Material polyamide, ca. RAL5017
fire class: B1 (UL 94 V0)
D-R 220T R3 REFLECTOR
Type optical retroreflector, optimized for 9.5 to 11m distance to measuring head
Dimensions ca. 150 x 110 x 140 mm
Weight ca. 1.6 kg
Material polyamide, ca. RAL5017
fire class: B1 (UL 94 V0)
D-R 220T DUST PROTECTION TUBE
Dimensions ca. 280 x 110 x 110 mm
Weight ca. 3 kg
Material 1.4571
D-RV 220T BW BRACKET
Dimensions 160 x 280 x 190 mm
Weight 4 kg
Material 1.4571
Fixture 4x bolt d= 8 to 10mm
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