"Guided wave designs have a probe to get the energy down to the liquid and back," says Boyce Carsella, radar product manager for Magnetrol.
"The return signal strength is much higher if product contact is not a problem."
Radar sensors are especially useful in reactors where there are high internal pressures, high temperatures, mists, vapors, turbulence, and other problematic conditions."The biggest issue is foam," says Carsella
."The questions we ask are, what is the dielectric constant of the liquid, what is the bubble size or density, and how thick is the foam layer?"He
advises that guided wave designs are better able to see through a heavy foam layer.