SM150T User Manual 1.0
Appendix 1
47
Insert SM150T into the wet sample and record its output in
Volts.
V
w
= 0.349V
Dry the sample until still moist, ~15% water content. Gentle
warming can be used to accelerate the process, but take care
not to over-dry in places, and allow time for the water content
to equilibrate throughout the sample before taking a reading.
Reweigh.
W
m
= 693.2g
Re-measure with the SM150T.
V
m
= 0.180V
Dry the sample thoroughly.
With clay soils this is usually achieved by keeping it in the
oven at 105°C for several hours or days (the time required
depends on the sample size and porosity).
Weigh the dry sample in the beaker
.
W
0
= 627.2g
Calculations
Substituting in the SM150T equation
√𝜖 = 1.0 + 14.4396𝑉 − 31.2587𝑉
2
+ 49.0575𝑉
3
− 36.5575𝑉
4
+ 10.7117𝑉
5
