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MOVING SURFACES & INTERNALS

Level Measurement with Agitation

Agitation creates waves, vortexing, foam and moving obstructions. The useful measurement must be separated from short-term surface motion and false signals from the mixer assembly.

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DIRECT ANSWER

What is the practical starting point?

A stable result begins with the tank drawing and operating cycle. Mount the sensing path away from blades, shafts, baffles and the filling stream where possible, then choose a technology and damping strategy that still responds fast enough for the control or protection duty.

APPLICATION BOUNDARIES

When to use—and when to stop and review

When to consider this approach

  • Mixing vessels where the agitator geometry and speed range are available
  • Processes that need continuous trend or a separately defined point alarm
  • Applications where an acceptable response time can be stated

When not to assume suitability

  • Do not position a radar beam or probe through the blade sweep.
  • Do not hide a poor echo or unstable process behind excessive damping.
  • Do not assume a stilling arrangement is compatible with a coating, viscous or solids-bearing medium.

SELECTION FACTORS

Data to confirm before model selection

Use this list to prepare a traceable quotation request.

  1. 01Tank diameter, height and nozzle coordinates
  2. 02Shaft, blade and baffle geometry
  3. 03Mixer speed and operating sequence
  4. 04Surface vortex, waves, foam and filling stream
  5. 05Medium dielectric, density, viscosity and buildup
  6. 06Required response time, control duty and alarm independence

TECHNOLOGY COMPARISON

Compare the decision factors

Starting pointPotential advantageApplication boundary
Non-contact radarNo probe exposed to blade loadsBeam path, false echoes, foam and moving surface require review
Guided wave radarGuided signal can reduce dependence on a free-space beamProbe must avoid mechanical contact, coating and lateral loads
Hydrostatic or DPNot based on the moving top-surface echoDensity, vapor pressure and impulse or seal arrangement affect result
CapacitanceSimple continuous or point arrangement for suitable mediaCoating and dielectric variation can dominate calibration

EXAMPLE APPLICATION

How to frame the requirement

Mark the mixer shaft, maximum blade envelope, baffles, inlet and proposed nozzle on one drawing. Review readings at stopped, low-speed and maximum-speed conditions before finalizing signal damping.

RELEVANT INSTRUMENTS

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FAQ

Questions engineers ask first

Last reviewed:

Will signal damping solve an agitated level reading?

Damping can reduce valid short-term movement, but it cannot correct a blocked signal path, blade echo, coating or unsuitable technology.

Where should a top-mounted radar be installed?

The exact location is vessel and model specific. It should normally keep the radar beam clear of the agitator, inlet stream and strong internal reflectors, using the controlled installation instructions.

ENGINEERING SUPPORT

Turn process data into a reviewable instrument request.

Share the medium, operating envelope, installation and required output. We will flag missing information before confirming a model.

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