Table 12 Examples of slot filling material
Material (Vaisala Code) Specifications
Montocryl (19423) • Acrylic mortar
• One batch for 4 … 6 sensors (assuming some other material, such as sand
and bitumen, is used for covering the cable slot)
Instarmac PY5 Grout
Ultracrete Mortar (summer
grade INSTARMAC, winter
grade INSTARMAC‑W)
• Polyester resin mortar
• One 25 kg (55 lb) batch for 2 … 4 sensors
• Requires the use of concrete color dye (black) for the epoxy to be black
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
To avoid personal injury, follow the safety instructions provided with the
material.
WARNING!
Hot material is only meant for professionals.CAUTION!
Table 13 Equipment for hot filling material
Equipment Specifications
Slot filling material, such as
construction bitumen
(asphalt cement)
To fill the slot. 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.
4.4.2 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 weather station enclosure to the road or
runway edge.
Chapter 4 – Installation
37
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