User Manual

8 TECHNICAL DATA
96
OPTIWAVE 7400-24 C
www.krohne.com 12/2015 - 4004901901 - MA OPTIWAVE7400-24 R01 fr
8.4 Antenna selection
The graphs below show which antenna to select for the application based on:
• D, the measuring range,
• ε
r
, is the dielectric constant of the product being measured
Figure 8-3: Minimum power supply voltage for an output of 22 mA at the terminal (Hazardous Location approval (Ex d /
XP/NI))
X: Power supply U [VDC]
Y: Current output load R
L
[Ω]
Figure 8-4: Selection of antenna for liquid applications (graph of distance in m against ε
r
)
Figure 8-5: Selection of antenna for liquid applications (graph of distance in ft against ε
r
)
1 Distance, D [m]
2 Distance, D [ft]
3 Dielectric constant (ε
r
) range for storage/still well applications
4 Dielectric constant (ε
r
) range for process/agitator applications
5 DN80, DN100, DN150 or DN200 Horn antenna with a still well, or DN150 or DN200 Horn antenna without a still well
6 DN80, DN100, DN150 or DN200 Horn antenna with or without a still well, or DN80 or DN150 Drop antenna without a
still well
7 DN40, DN50, DN80, DN100, DN150 or DN200 Horn antenna with or without a still well, DN80 or DN150 Drop antenna
without a still well or Hygienic antenna