Material (Vaisala Code) Specifications
Certite (CERTITE) • Polyester resin mortar
• One 25 kg (55 lb) batch for 2 … 4 sensors
• Requires the addition of Kiln Dried Sand to add a course texture to the
mixed grout
• Suggested mixing ratio: 2.5 parts powder: 1 part sand: 1 part resin
Hot material is only meant for professionals.CAUTION!
Table 11 Equipment for Hot Filling Material
Equipment Specifications
Slot filling material, such as
construction bitumen
(asphalt cement)
You can use construction bitumen also to cover the fill, or elastomeric
bitumen.
Containers and tools To heat and pour the bitumen.
Dry filler sand To increase the thermal conductivity of the filling material. Size: 0.1 … 0.6 mm
(0.004 … 0.024 in).
Suitable stainless steel
ducting
To protect the sensor cable in the asphalt cut. Size: approximately
20 … 30 mm (0.79 … 1.18 in) in outer diameter. You can use one duct for each
cable, if needed.
15.5.2 Cable Ducting for Embedded Sensors
Cable ducting protects against vermin damage, eases reinstallation in case the sensor needs
to be replaced, and directs water away from the duct. Follow these guidelines:
• Use plastic ducting for the cable from the enclosure to the road or runway edge.
• With hot filling material, use a duct of robust material, such as stainless steel, from the
road or runway edge to the sensor. Plastic ducting may start cracking when the road or
runway is resurfaced. The material must also be resistant to de-icing and other
chemicals.
• Use as narrow a duct as possible. The larger the slot, the greater the risk is for the slot
filling material to start cracking.
• Use at least 60 mm (2.36 in) slot
filling material on the top of the duct.
• Seal the ducting from the sensor end with tape. Leave the other side open so that water
can drain from there.
• To allow water to exit the duct, drill a hole to the lowest part of the duct.
Chapter 15 – Subsurface Sensor Installation
189
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