SWT4 User Manual v3.1
Installation
19
3.3 Installation procedure
For the installation of the Tensiometer in the field the following tools
are required:
Tensiometer auger with diameter 25 mm, ideally the
SWT4-AUG
Gouge Auger
with shaped blade tip.
Rule, spirit level, angle gauge, marker pen.
Notebook, camera for documentation of site and soil profile.
Perhaps PE-plastic bags for taking soil samples from the site.
Thermal insulation tubes for installations from soil surface.
Cable protection conduit.
Tube Jackets if required (inner diameter > 35 mm).
Please observe the following notes:
Do not touch the cup with your fingers. The ceramic should not have
contact with grease or soap as this will influence the hydrophilic
performance.
Do not leave the cup in air for more than 5 minutes as Tensiometer
water will evaporate and the Tensiometer will need to be refilled.
Procedure:
1. Mark the required drilling depth on auger and Tensiometer shaft.
The reference point is the center of the cup. Drill a hole with the
desired depth on the chosen measuring spot. Auger in steps. Take
care when drilling the last 20 cm, remove and save this soil. Water
will not run along the shaft if the Tensiometer is installed in an
angle because the water will drain into the soil before it reaches
the cup.
Read the chapter "Selecting the installation angle" for the best
installation angle on page 18.
2. When using augers with a diameter of over 25 mm, mix a paste of
water and crumbled soil material taken out of the borehole. Fill the
paste into the bottom area of the borehole by using a simple pipe
with outer diameter 2 cm.
