Visibility Monitor for tunnel safety – VisGuard 2 extractive dist. 30-500m, cable L=approx. 1.8m incl. conn., adapt. to check. rod

The VisGuard measures the scattered light intensity of a sample drawn into the instrument. Filtered purge air is fed through the flow cell, thus enveloping the sample in a protective shroud of clean air. This effectively keeps the optics clean. Installations are either in the tunnel cavity/niches (in-situ) respectively using extractive sampling away from the cavity. An optional sample heater eliminates the influence of any mist effects.

Continuous monitoring of oil mist concentration using scattered light principle
Easy to service, high sensitivity, stability and accuracy
A special sample flow concept entirely eliminates the danger of flow cell contamination