Campbell Scientific Bowen Ratio Instrumentation - Manual (Page 13)

Section 2. Station Installation
2-3
To minimize thermal conduction down the sensor lead wires, they should be
buried for a short distance back from the sensor. In particular, do not run the
leads directly to the surface, but wrap them around the edge of the hole,
keeping the leads at the same level as the sensor for as long as possible. Once
the sensors are installed, backfill the hole.
Install the CS616 as shown in Figure 2.2-1. See the CS616 manual (Section 5)
for detailed installation instructions.
2 cm
6 cm
8 cm
Ground Surface
Up to 1 m
2.5 cm
FIGURE 2.2-1. Placement of Thermocouples and Heat Flux Plates
Partial emplacement of HFT3 and TCAV sensors
is shown for illustration purposes. All sensors
must be completely inserted into the soil face
before the hole is backfilled.