Umwelt-Geräte-Technik GmbH
| Eberswalder Str. 58 | D-15374 Müncheberg | phone: +49 (0) 33 43 2 - 89 575 |
4.3.
Pressure Readings
The Tensio 140 provides an analog output signal between 0 and 1 V. To transform the output signal
into a pressure value the signal range (0
–
1 V) has to be transferred linearly to measurement range
of the pressure transducer (+0.3 bar to
–
1 bar). A signal of 1 V thus equals a Tension of 1 bar (or
1000 hPa). A signal of 0 V equals an overpressure of 0.3 bar. A Tension of 0 bar (e.g. at saturation
with no back water) is indicated by an output signal of 0.23 V.
5.
Maintenance and Repair
•
In case of air bubbles in the tensiometer check the tensiometer for leaks (the ceramic cup or
the sealing ring might be damaged) and check if the tension in the soil has been lower than the
measuring range of the tensiometer, which may caused the tensiometer to dry out
•
Repair possible damages (repairs are best executed by qualified technicians of our company)
and remove air bubbles by refilling distilled water through the safety screw
•
Protect the tensiometer from mechanical forces
6.
Caretaking
The Tensio 140 does not need to be calibrated at maintained on a regular basis. However, an
appropriate caretaking and storage can increase functionality and life span of the tensiometer.
6.1.
General Care and Storage Instructions
•
Always put the tensiometer in the supplied safety/transportation case to prevent it from
damage.
•
The sponge of the transportation case should be wet during transportation.
•
Protect the tensiometer from frost. Storage and use of the tensiometer at temperatures below
0 ° can lead to damage of the device.
•
After use clean the tensiometer cap with a sponge and distilled water to remove dirt.
•
To clean the ceramic cup you can push water at a low rate through the cup by applying a light
pressure.
•
Do not let the ceramic cup dry when it is dirty.
•
If required you can clean the cup carefully by using wet sandpaper.
