Check the sensor visually once a year before the wintertime.
1. Check that the sensor lies below the road surface.
On a very rough road surface, the sensor must lie approximately 3 mm (0.12 in) below
the surface.
On a smoother road surface, the sensor must lie approximately 1 mm (0.04 in) below
the surface.
2. Check the position of the sensor with the installation plate or a spirit level.
The sensor surface must be in horizontal position so that moisture spreads equally on
the surface.
1 Bitumen
2 Filler sand
3. If the sensor surface is too high, to lower the sensor, grind the sensor surface.
5.17.2
 Lowering DRS511
• Screwdriver
• Hammer
• Belt grinding machine or similar
• Sandpaper (roughness 800 recommended)
• Water
• Wet wipe
Chapter 5 – Maintenance
113
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