Jacket Tubes; Ideal Conditions For Installation; Documentation; Selecting The Installation Angle - UMS T8 User Manual

Installation

3.1.5 Jacket tubes

Jacket tubes are useful with shafts longer than 2 m, in pebbly soils or
gravel, and for horizontal installations from inside a well or pit hole.
The jacket tube should end 30 to 50 cm away from the cup so
leaking or condensation water is not conducted to the cup. The inner
diameter of the jacket tube should be at least 35 mm.
3.1.6

Ideal conditions for installation

For the installation of Tensiometers, the ideal conditions are:

Frost-free soil.

Wet coarse clay or loess.

Low skeletal structure (gravel). The more gravel in a soil the
more often the drilling has to be repeated to reach the required
depth.

3.1.7 Documentation

For every measuring spot you should:

Measure out the position where the pressure sensor will be
placed. (A must for installations below the ground surface).

Take documenting photos before, during and after installation.

Save a soil sample.

Write down installation depth and angle with the sensor
identification (serial number).

Mark all connecting cables with the corresponding sensor
identification, serial number or logger channel on each end. Clip-
on number rings are available as an accessory (see chapter 9.2).
3.2

Selecting the installation angle

An installation position would be ideal if the typical water flow is not
disturbed by the Tensiometer. No preferential water flow along the
shaft should be created. Therefore, Tensiometers are preferably
installed at an angle.
18/58