Level measurement
84 Continuous level measurement in liquids
4. Instrument selection within the measuring principle
Servo (tank gauging)
Servo – Tank Gauging
Required application data • Pressure and temperature • Medium density • Required material compatibility
• Nozzle diameter • Measuring range • Required accuracy • For stilling well: Internal pipe diameter
Technical data • Process pressure • Process temperature • Accuracy • Process connection • Wetted parts • Measuring ranges
Application limits for servo level measurement
• • • • • Viscosity from 5000mPS s
• Gastight feedthrough • Technical Information Applications Horizontal storage tank cyl. Vertical storage tank Buffer tank Recipient tank Process tank Stilling well Bypass Pump shaft Channel measurement Application limits
C
Advantages • Unaffected by dielectric constant • Unaffected by conductivity • Multiparameter measurement: Level, density, interface
For reliable measurement
Use a stilling well whenever possible.
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