Campbell Scientific 107-L Temperature Probe - Manual (Page 15)

Model 107 Temperature Probe
FIGURE 7-2. 107 and 41303-5A Radiation Shield on a
CM200 Series Crossarm
The 107 is held within the radiation shield by a mounting clamp on the bottom
plate of the 41303-5A (FIGURE 7-2). Loosen the two mounting clamp screws,
and insert the probe through the clamp and into the shield. Tighten the screws
to secure the sensor in the shield, and route the sensor cable to the instrument
enclosure. Secure the cable to the tripod or tower using cable ties.
7.4 Water Temperature Installation
107 probes can be submerged to 15 m (50 ft) or 21 psi. The 107 is not
weighted, so a weighting system should be added, or the probe secured to a
fixed submerged object such as a piling.
7.5 Soil Temperature Installation
The 107 tends to measure the average temperature over its length, so it should
generally be buried such that the measurement tip is horizontal to the soil
surface at the desired depth.
One or two coils of cable should also be buried in a shallow installation. Burial
of some cable mitigates the effect of solar heating of the above ground cable on
the temperature measurement.
Placement of the cable inside a rugged conduit may be necessary for long cable
runs, especially in locations subject to digging, mowing, traffic, use of power
tools, or lightning strikes.
The maximum burial depth for soil that could become saturated with water is
dictated by the maximum water pressure allowed for the sensor, which is 21
psi.
41303-5A
107
Tripod Mast
or Tower Leg
CM200 Series Crossarm
9