Campbell-scientific CS650 and CS655 Water Content Reflectometers Manuel d'utilisateur télécharger pdf (Page 41)

CS650 and CS655 Water Content Reflectometers

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 CS650 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

mass 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 mass. This tray will hold 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 above.

To obtain m

dry

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

mass for m

dry

. Calculate gravimetric water content, θ

, using

wet dry

dry

m m

−

To obtain soil bulk density, use

bulk

dry

cylinder

volume

Volumetric water content is calculated using

θ θ ρ

v g bulk

= *

9. Maintenance

The CS650 does not require periodic maintenance.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 55 56

Commentaires sur ces manuels

Pas de commentaire

Campbell-scientific CS650 and CS655 Water Content Reflectometers Manuel d'utilisateur Page 41

Commentaires sur ces manuels

Produits connexes et manuels pour Instruments de mesure Campbell-scientific CS650 and CS655 Water Content Reflectometers