Features

• Installation in-situ
• Stainless steel housing 1.4404 (AISI 316L)
• IP rating IP69K
• Connection to tunnel control system by:
  • MODBUS RTU (RS-485)
  • MODBUS/TCP (Ethernet)
  • Analogue and relay outputs
  • Web service (Ethernet)
• Integrated web server for visualisation, configuration, data logging, remote maintenance (Ethernet option only)
• Optional smart/HUB IoT operating and control unit with touch display
• Plug & play operation

System Set-up

smart/AQM sensor to be mounted either:

• in-situ – directly in the tunnel’s driving area
• extractive – in a niche, cross-cut, etc.
• Terminal box – with 24 VDC power supply for connection of supply and signal cables
• System cable with quick connectors between sensor and terminal box for easy exchange
• Optional smart/HUB with touch display

Operation

Visibility and gas monitoring during normal operation is used to control the tunnel ventilation at normal operation. The need (and level of power required) for artificial ventilation by jet fans depends on the measured visibility and gas concentration.
Visibility is expressed by the extinction coefficient, which describes the light attenuation caused by particles in the air.
The sensor extracts air from the tunnel by an integrated fan and feeds it into the measuring cell which detects the intensity of light scattered by this sample, sets it into relation with the light passing through and calculates the extinction coefficient.
Optional electrochemical gas sensor cells induce currents proportional to the prevailing gas concentration. With these currents and the measured temperature, the gas sensor modules calculate the gas concentrations.

Advantages

• Specifically designed for application in tunnels
• Single sensor instead of transmitter/receiver pair requiring exact alignment
• Effective fog elimination by optional heater
• Easy recalibration by calibration plug
• Internal purge air system keeps optics clean and prevents long-term drift
• Robust stainless steel housing for protection against corrosion and water jets
• Permanent condition monitoring
• Remote maintenance
• Low maintenance requirements, stable, accurate
• Pre-calibrated gas sensor modules for easy exchange
• Flexible integration into tunnel control system
• Ethernet port
• Mounting height in accordance with Austrian RVS
• Menu guided recalibration of gas sensor modules
• Smart IoT solution from sensor over hub to asset management software

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Features

• Luminance meter for measuring L₂₀ luminance in the access zone mounted on a mast in front of the tunnel portal or
• Luminance meter to measure luminance in the threshold zone L_th mounted on the tunnel wall
• Luminance meter for measuring luminance in interior zone L_fi mounted on the tunnel wall
• Power supply 230 or 115 VAC
• Signal outputs connected to lighting control system or tunnel control system
• Zoom lens to adjust the focus areas
• Sensor with V(λ) filter and silicon photo element
• Temperature compensated and long term stable amplifier for the photoelectric current using live zero
• Heated housing with protection class IP67 either made of stainless steel 1.4571
• Electronically controlled heating and temperature monitoring
• Mounting flange to adjust horizontal and vertical angle
• Fault indication by relay isolated contact (NC)
• Optional second output channel for increased resolution at low lighting levels
• Surge protection.

System Set-up

• Photometer in camera housing (Luminance camera) mounted on the tunnel wall or a pole in front of the tunnel portal
• Power supply (230 or 115 VAC)
• Signal outputs connected to lighting control system or tunnel control system

Operation

The requirements for tunnel lighting are determined by the nature of the human eye. How well the eye recognises vehicles and other obstacles in a tunnel depends on the lighting and visibility as well as the reflection characteristics of the road surface and the tunnel walls. Tunnel lighting needs to be adapted to these environmental conditions.

The tunnel lighting must be controlled so that users, both during the day and by night, can approach, pass through and exit the tunnel without changing direction or speed with a degree of safety equal to that on the approach road. Especially the lighting of a tunnel entrance should be adequate to avoid the “black hole effect” when a driver enters the tunnel.

Luminance is the measure representing what a human being perceives as brightness and as such is the main control variable for the tunnel lighting.

The luminance photometer comes with a zoom lens that is focused to measure the relevant area. Light from this area through the lens is directed to the photo element detecting its intensity. The integrated evaluation unit then calculates the luminance and provides it through the analogue output(s).

Advantages

• Specifically designed for tunnel applications
• Customisable measuring ranges
• Same luminance meter for all measuring ranges and applications
• No moving parts
• Sensor is easy to remove out of housing withoot any tools
• Housing resistant against corrosion, UV, oil and acid
• Extremely low maintenance requirements.

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The post JES t/LUM-A Luminance meter (Tunnel Luminance Photometer) appeared first on Thomson Environmental Systems.

Features

• Easy data transfer via Bluetooth, RS485 or CAN-Bus
• Dynamic mobile data in real time and 100 times per second and a max. output rate of 10Hz.
• Multifunctionality
• Measurements both on the ground and in the ambient air
• Easy to install and to clean
• Free MARWIS app for calibration, data view as well as transfer available on Google Play and iTunes
• One or two meter version for different vehicle types

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The post LUFFT MARWIS-UMB Mobile Road Sensor appeared first on Thomson Environmental Systems.

Features

• Freezing temperature output already from pre-set dry-damp threshold (e.g. 10µm according to new TLS specification).
• Replaceable sensor electronics (for easy calibration or maintenance)
• Polling via RS485 interface
• Low energy consumption (solar operation)
• Radar principle to measure water film
• Analogue outputs in combination with a converter (DACON – 8160.UDAC)

Download Technical Data

The post LUFFT Intelligent Passive Road Sensor IRS31Pro-UMB appeared first on Thomson Environmental Systems.

It measures surface conditions such as wetness, ice, snow, or frost as well as water film heights, ice percentage in water and freeze point temperature. Through these measurements it generates the friction coefficient on the road or runway.

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The post LUFFT NIRS31-UMB – Non Invasive Road Sensor appeared first on Thomson Environmental Systems.