LED colour coding for construction-site safety

LED colour coding for construction-site safety

Market news |
By Julien Happich

The aim of these OSV techniques initiated at the University of Kobe, Japan, is to break free of language barriers on large construction sites in countries with low literacy rates, increasing construction site safety levels through easy to understand visual cues.

Among the LED-based warning solutions that are promoted by the OSV Consortium are the Light Emitting Converters (LECs) units which can be automatically switched across a variety of sensors (inclination, deformation, strain, stress, pressure, pH, temperature, humidity, etc.) and serve as data loggers as well as displaying in real-time colour-coded warning lights (OK, not OK thresholds).

The LEC was used to monitor temperature and humidity of secondary lining concrete curing in a tunnel constructed with the New Austrian Tunneling Method.

The Light Emitting Inclination Sensor features two internal acceleration sensors maintained at 50ºC, which precisely measure the inclination of a structure and displays the resultant data as coloured light. The devices achieve an angular measurement accuracy within 1/100 degree.

Light Emitting Deformation Sensor include a wire rod deformation detection device that applies the LED concept to rock bolts and ground anchors, allowing on-site engineers to visualize at a glance the anchor’s axial tension.

A late example of such safety monitoring methods has been implemented in metro system construction sites in Jakarta, Indonesia, as part of a Japan International Cooperation Agency (JICA) project.

The LEDs light up like traffic lights to indicate the danger level with different colors: blue for “no irregularities”, and yellow and red for “danger of collapse.”

Visit the OSV Consortium at

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