Offset Correction For Non Horizontal Installations - UMS T5 User Manual

Installation
8. Connect the signal cables as described in the chapter
"Connecting the T5 or T5x".
9. Write down the serial number, position, installation angle and
depth.
10. Protect the cables against rodent bites. Lead the cables through
plastic pipes or use the plastic protection tubes which are
available as an accessory.

3.3 Offset correction for non horizontal installations

3 mm
Compensate the offset:

by calculation,

by entering the installation angle in the Infield7 for spot readings,

in the configuration of a data logger by setting an offset.
The deviation is largest for a vertical water column (at 0
column drawing on the pressure transducer is equal to the shaft
length, ranging from 2 to 20 cm. The offset is shifted for 0,1 kPa per
cm shaft length.
Example: A 5 cm vertical column of water below the pressure
sensor will create an 0.5 kPa offset. This means that when the soil
water tension is 0 kPa the sensor will indicate -0.5 kPa.
(1 cm water column corresponds to a pressure of -0,983 hPa.)
Centre of pressure transducer
The pressure transducer is calibrated without
a cup. Thus, no compensation is required for
horizontal installations.
If a T5 or T5x is installed in a non horizontal
position, the vertical water column draws on
the pressure sensor and causes an offset
shift.
Centre of ceramic
17/48
o
). The water