Appendix
Englisch, Revision 14, Date: 07.02.2017
54
D
Influence of Water
Reading height was 80 mm [
3.15 in] in all cases. The signal strength level at this dis-
tance in air represents 100 % in the following measurements. The water level was mea-
sured from the bottom of the transponder. The transponder top was also moist during
the measurement with 30 mm water level (splash water). A road salt/water mixture was
used for emulating natural seawater. For comparison, seawater has a conductivity of
about 42 to 55 mS/cm. Through evaporation a salt crust can form on the transponder
top which then leads to punctual higher conductivity.
Figure 33
Attenuation of the sum voltage as a function of the conductivity of the water
(30 mm water level)
Figure 34
Attenuation of the sum voltage as a function of the conductivity of the water
(75 mm water level)
Tip!
Install the transponder slightly elevated, so that it will not be com-
pletely submerged under salt-saturated water.
Conductivity of the water [mS/cm]
Su
m vol
ta
g
e [
%
]
Conductivity of the water [mS/cm]
Su
m vol
tag
e
[%]