Ultrasonic Turbidity Measurement
Per definition is Turbidity an optical Impression.
Turbidity describes the characteristic of a transparent product, to scatter or absorb light. A focused light beam will be attenuated and scattered in hazy products, so that this product can become practically opaque in bigger layers. Turbidity is caused by particles in transparent products. A particle is defined as something with a different refractive index as the carrier liquid. Some examples of particles are minerals, yeast cells, metals, oil drops in water, milk in water, gas bubbles and aerosoles.
The ultrasonic particle measurement is used to detect non-dissolved (suspended) particles in a liquid, similar to a turbidimeter. Turbidity is an optical effect. Therefore the acoustical method is typically named as particle or concentration measurement. Different as at the optical method here a particle is defined as something with a different speed of sound as the carrier liquid. Equal to a sonar system, the acoustic probe will transfer ultrasonic pulses into the measurement sample. When the acoustic pulses hit particles inside these sample, a part of this ultrasonic energy will be reflected as an echo. The quantity and intensity of these echoes will be detected, evaluated and shown as measurement values.
The model AS3/AT3 has no wearing parts. The ultrasonic pulses used for measuring, continuously clean the probe itself. Therefore the system is virtually free of maintenance. A calibration interval of 36 months is sufficient under typical process conditions. The device replaces the optical measurement in critical applications where measurement windows get coatings and become opaque. Typical applications are oil in condensate, oil in cooling water, brine filtration, etc.