10
Introduction
SWT4 User Manual v3.1
Please note:
Especially in loamy, clayey soils a high pressure can occur just by
inserting the SWT4 or SWT4R into the borehole. Thus, the
pressure values should be continuously observed during
installation with an SWT-MR/Infield7 Manual Readout Unit or a
data logger.
Keep it less than -200 kPa, i.e. -2000 hPa
The less air left inside the cup and the better the soil's conductivity
is, the faster the Tensiometer will respond to tension changes.
If the soil is dryer than -90 kPa (-900 hPa), it does not make sense to
refill the Tensiometer immediately. Wait until any Tensiometer that is
installed in the next lower level again reaches the reading it had when
the upper Tensiometer dried out.
