8.4.5 Calculations
The empty cylinders used for core sampling should be clean and both empty mass and volume
are measured and recorded. For a cylinder, the volume is
where d is the inside diameter of the cylinder and h is the height of the cylinder.
During soil sampling it is important that the cores be completely filled with soil but not extend
beyond the ends of the cylinder.
Once soil core samples are obtained, place the soil-filled cylinder in a small tray of known empty
mass. This tray holds the core sample during drying in an oven.
To obtain m
wet
, subtract the cylinder empty mass and the container empty mass from the mass
of the soil filled cylinder in the tray. Remove all the soil from the cylinder and place this soil in the
tray. Dry the samples using oven or microwave methods as described earlier.
To obtain m
dry
, weigh the tray containing the soil after drying. Subtract tray mass for m
dry
.
Calculate gravimetric water content, θ
g
, using
To obtain soil bulk density, use
Volumetric water content is calculated using
9. Maintenance and
troubleshooting
The CS650 does not require periodic maintenance.
(p. 33) provides troubleshooting
information.
CS650 and CS655 Water Content Reflectometers
32
