Campbell Scientific IRS21 Road Weather User Manual
Page 18
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IRS21 Lufft Intelligent Road Surface Sensor
FIGURE 3-11. Application of the sensor cable epoxy.
The saw cut is two inches deep. The backer rod is placed in the length of the saw cut below and above
the sensor cable before epoxy application.
5/8” diameter
3/8” diameter
Backer Rod
Sensor Cables
(IRS21 and
107s if used)
2”
½”
The backer rod in the saw cut should have a friction fit. When the epoxy fills
the saw cut, if there is no friction fit, the backer rod tends to float to the road
surface.
14
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