KROHNE OPTIWAVE 7300 C Handbook page 60

Notes:
Level should be taken from the bottom of the device's measuring range (tank height).
Concentrate points in areas where there are curved surfaces or abrupt changes in cross-sectional area (see
example in the diagram and table below) - this will improve measurement accuracy.
Low-dielectric non-standard products: how to measure them correctly
As described in section 8: Measuring principle, the device can measure low dielectric products.
However, certain situations such as:
• build-up on the antenna and nozzle
• products that do not correspond to preset conditions available in the quick setup menus
• parasite signals from unavoidable nearby obstructions in the tank
can affect device performance.
You can use the following menu items to regulate the device's ability to track product level
• Measuring mode
• Product ε
r
• Multiple Reflections
• Empty Spectrum On/Off
• Signal screen editing mode [distance of target signal]
Measuring mode
function 1.13.0
Using this function, you can define a mode for measuring the product that is adapted to its properties
(dielectric constant).
For further information regarding the measuring principle, please refer to Section 8: Measuring principle.
Three modes are possible:
• Direct: direct measurement of the surface of the product
• Full TBF: TBF is activated over the total measuring range i.e. tank height. In order to reduce
inaccuracies, type in an exact value of dielectric constant in function C1.14.0 Product ε
for process tanks.
• Partial TBF: TBF mode is only active near to the tank bottom i.e. 20% of tank height but not less than
0.6 m. If filled above 20% capacity, the measurement mode will switch automatically to direct mode
(using the reflection from the product surface). In order to reduce inaccuracies, enter an exact value of
dielectric constant in function C1.14.0 Product er. Recommended for storage tanks with flat bottoms.
OPTIWAVE 7300 C
Handbook OPTIWAVE 7300 C
. Recommended
r
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