Campbell Scientific UT20 and UT30 Tower-based Weather Stations - Manual (Page 51)

UT20 and UT30 Tower-based Weather Stations
8.5.5 107/108 Temperature Probe
Mount the 107 temperature probe inside the 41303-5A or UT6P 6-Plate Gill
Radiation Shield as shown in FIGURE 8-18.
1. Loosen the two mounting clamp screws on the base of the radiation shield.
Insert the 107 probe through the mounting clamp until the white heat
shrink is even with the bottom of the clamp.
2. Tighten the two screws evenly until the clamp is snug against the sensor
lead.
FIGURE 8-18. 107 Temperature Probe
8.5.6 107/108 Soil Temperature Probe
1. Select an undisturbed area of ground on the side of the tower that will
receive the least amount of traffic. Route the sensor lead from the
datalogger to the selected area.
2. Dig a narrow trench next to the sensor lead, ending the trench at least 6
inches short of the probe tip. Lay the sensor lead into the trench.
3. Use a screwdriver to poke a horizontal hole into the undisturbed soil at the
end of the trench at the appropriate measurement depth. Insert the probe
tip into the hole and carefully backfill the trench.
4. If bare soil is required, a soil sterilant such as Paramitol can be applied to
the area where the probe is buried. Soil erosion can be a problem when
the probe is under bare soil. To prevent erosion from occurring, bury a 36-
inch square frame constructed from 2-inch x 4-inch lumber around the
probe, with the top of the frame even with the soil surface.
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