Specifications

Section 4. Sensor Installation
4.6 107/108 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"
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” square frame constructed from 2” x 4" lumber around the probe, with
the top of the frame even with the soil surface.
4.7 HMP50 Vaisala Temperature and RH Probe
Mount the HMP50 probe inside the 41303-5A 6-plate radiation shield as
shown in Figure 4.7-1.
1. Loosen the two mounting clamp screws on the base of the radiation shield.
Insert the HMP50 sensor through the clamp until the base of the sensor is
even with the bottom of the clamp.
Tighten the two screws evenly until the clamp is snug against the sensor base.
4-6