Illios

The ILLIOS measures the level of illuminance within the tunnel bore to ensure interior illumination levels are being continuously maintained in order to affect safe lighting conditions for drivers. Illuminance, or incident lighting, determines the amount of light that covers a specific surface or area within the tunnel.

Designed specifically for the tunnel environment, the ILLIOS continuously measures cosine corrected planar illuminance within the tunnel thus allowing elimination of directional error. The ILLIOS measures the illuminance over a standard range of 0-20,000 lux, but outputs can be scaled as required within this range.

Like the LUMIOS, the ILLIOS uses a specially designed, highly light-sensitive photocell, filtered to provide a spectral response close to that of the average human eye, to react to changes in light levels within the tunnel environment.

The ILLIOS is a self contained intelligent analyser and the measurements are converted into an output signal of 4-20 mA (directly proportional to the illuminance measurement) for hard wire connection and signal transmission to a host controller. The ILLIOS also comes with alarm relay contacts and ModBus serial communications protocol.

Having been designed for tunnel environments, the ILLIOS is of rugged construction using powder coated stainless steel to achieve an IP67 / NEMA 4X protection rating. The ILLIOS is able it to withstand the corrosive atmosphere and regular tunnel washing that the tunnel environment endures.

The ILLIOS has an operating temperature range from -30º - +70ºC which ensures stable readings across all prevailing ambient temperature conditions.