Level measurement
12 Continuous level measurement in liquids
2. Checklist
You should be familiar with all of the requirements of your application for the selection of the right instrument. The checklist on page 9 provides an overview of relevant process data and will help you to take the same into consideration. If we have not included all of the details, please supplement the list by your criteria. The checklist is required both for the selection of the measuring principle and the selection of the instrument.
Radiometry is not included in detail in the following chapters. For specific information please contact our sales team.
A
TIP Copy this checklist and complete it to have all relevant data at your disposal in the selection process.
The following table compares the individual measuring methods and is supposed to assist in a first preselection.
Selection guide
Radar Guided radar
Ultrasonics Hydrostatic Capaci- tance
Condensate
+ + + + + + + + + + + O O + +
+ + + + O O O O + + O + + O
O O + + + + + O
+ + +
+
Foam formation
O O
Changing media (density)
–
+
Low DC
+ + O
O O O
Viscosity
Build-up formation
Small tank (blocking distance)
+
+
Hygienic application (cleanability)
+
+ + O O + + +
+ + O + + + +
Pressurization
O
Simple maintenance (disassembly)
+
Independent of installation site
O O O O
Unaffected by obstacles
Small tank (fast level change)
Vapor pressure > 50mbar/+20°C, > 0.73psi/+68°F)
+
CIP/SIP temperature cycles
+
+
+
+
+
+ = recommended
O = restricted (observe limits)
– = not recommended
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