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

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