Campbell CS616 Instruction Manual download pdf (Page 44)

CS616 and CS625 Water Content Reflectometers

Gravimetric water content is calculated after the container weight is accounted

for.

wet dry

dry

m m

−

For the bulk density,

bulk

dry

cylinder

volume

the dry weight of the sample is divided by the sample tube volume.

The volumetric water content is the product of the gravimetric water content

and the bulk density

θ θ ρ

v g bulk

= *

The average water content for the replicates and the recorded CS616 period are

one datum pair to be used for the calibration curve fit.

8.5 Calculations

The empty cylinders used for core sampling should be clean and both empty

weight and volume are measured and recorded. For a cylinder, the volume is

volume













π* *

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 weight. This tray will hold the core sample during drying

in an oven.

To obtain m

wet

, subtract the cylinder empty weight and the container empty

weight from the weight 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 above.

To obtain m

dry

, weigh the tray containing the soil after drying. Subtract tray

weight for m

dry

. Calculate gravimetric water content, θ

, using

wet dry

dry

m m

−

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Campbell CS616 Instruction Manual Page 44

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