Campbell Scientific 107 107-L Temperature Probe - Page 15

41303-5A 107 Model 107 Temperature Probe Tripod Mast or Tower Leg CM200 Series Crossarm 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. 9