Level Measurement of Condensed Milk in Evaporators
Milk will reach about 48% solids, in the final stage of a multiple effect evaporator. The condensed milk runs down the walls of the last evaporator and is emptied through outlet piping in the bottom of the vessel.
It is important to control the level of the milk carefully to keep a constant head pressure and avoid pump cavitation. The vessel is under a varying vacuum, making reliable readings from pressure or sonic level measurement technologies difficult to achieve.
Drexelbrook installed an RF continuous transmitter in the outlet piping of the evaporator. The transmitter continuously monitors the level of milk in the pipe and controls the pump speed to avoid running dry causing cavitation and possibly damaging the pump. Also, if the pump cavitates, air pockets form in the milk upsetting the downstream density measurement, which is used to control the evaporator temperature and product quality.
The advantage of the RF admittance level transmitter is that the RF technology ensures reliable level measurement in a wide range of conductivities, regardless of the coatings that will occur on the probe. A patented coat-shield is ensuring the measurement will be exact, without ongoing maintenance. Warm, sticky condensed milk will cause faulty measurement on many technologies, but Drexelbrooks experience have already helped many food producers, to better monitoring of the content in the evaporators.
From a article produced by Ametek
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