Filling DRS511 installation slot with hot filling material - RWS200

RWS200 Installation Manual
Product status
Document code
M211608EN
Revision
AA
ft:locale
en-US
Product
RWS200
Document type
User guide
To create a constant thermal compatibility around each sensor, the block must be consistent. The space around the sensor allows free flow of grout to envelope the sensor without air bubbles. An oversize hole or too much grout around the sensor weaken the bond and stability.
DRS511 positioning (hot filling material)
1
Bitumen
2
Filler sand
  1. Lay a thin layer of filler sand on the base of the slot.
  2. Uncoil the sensor cables and place them in the slot.

    Check that the DTS12G sensor is not covered.

  3. Place the DRS511 sensor in the slot, 1 to 3 mm (0.04 to 0.12 in) below the road or runway surface. Make sure that no side of the sensor is more than 3 mm (0.12 in) below the surface.
  4. To brace the sensor to the center of the slot, fill the slot halfway with sand.
  5. Lay a thin layer of filler sand on top of the DRS511 cable connector and the cable duct to protect them.
    CAUTION Too much sand may deteriorate the flow properties of the filling material as well as its strength.
    Make sure that the cable is completely covered with either filler sand or cable duct before applying the hot material as the hot material may melt the cable.
    1
    Elastomeric bitumen (optional)
    2
    Construction bitumen
    3
    Filler sand
  6. Melt the construction bitumen in a suitable container according to manufacturer specifications.
  7. Check the sensor positioning again.
  8. Fill the slot with bitumen.
    1. Pour the bitumen around the sensor head and along the length of the slot to the surface.
    2. Add pieces of carton in approximately 1‑meter (3‑foot‑4) intervals to prevent the bitumen from flowing freely.
    3. Remove the pieces of carton when the bitumen starts curing.
  9. (Optional) Spread elastomeric bitumen on top of the construction bitumen.

    Overfill the slot to make sure that there are no cracks between the hole and the road or runway pavement.

  10. Make sure that the filling in the hole around the sensor is slanted towards the sensor so that moisture is able to accumulate on top of the sensor.

    This is needed for determining salt concentration.

  11. Allow to cure.

    The cure time depends on the air temperature as well as the filling material used. As the final curing takes place, use a wire brush to remove any excess filling material from around the sensor head as well as to roughen the surface. This will best reflect the surface tension of the surrounding road or runway.

    To speed up the curing, sprinkle filler sand on top of the filling. This also prevents the filling from spreading under car tires, if the road is opened for traffic before curing is finished.