One of the main technologies used for level measure- nal obstacles. For instance, there are some evaporators
ment is the hydrostatic pressure principle. But it brings used on sugar plants which have several internal tubes to
difficulties because it depends basically on the process guide the boiling sugar cane juice. These tubes do not per-
density. If we have any product addition, or temperature mit waves propagation, even the old manual way for level
changing as well, the “ρ.g.h” parameter will not be the detection like scales.
It is exactly what happens inside an evaporator. Gene-
rally, the intention is to increase product concentration and The Solution
sometimes to use the evaporation steam to co-generate
energy to the other areas of the plant.
Using a communicating chamber to the evaporator is,
Besides, other level devices like ultrasonic or free-waves undoubtedly, the best solution. And to this kind of installa-
radars transmitters can be affected by the steam, or inter- tion the most recommended technology are the guided
waves, using TDR (Time Domain Reflectometry) principle.
The reason: inside the chamber there is still density varia-
tion and steam. The guided waves radars use that princi-
ple, which allows very well confined waves propagation,
and target detection.
RD400. The waves propagate
only around the probe, with no
dust or steam interference
Evaporator tank in a Sugar Mill (São Paulo, Brazil)
The external chamber, flanges and bottom sealing kit
The vessel project must include the dead zones (upper
and bottom), and also a sealing kit to tension the single
probe from the equipment, as shown above.
It is recommended to use flanges and the vessel with 3
to 4 inches of diameter. All the mechanical parts can be
provided by Smar.
Smar innovated with this application, because of the
mechanical details, also projecting an installation allowing
the best waves propagation. Today, it is being used in a lot
of food plants in Brazil, Mexico and others.
RD400 inside an external chamber
See others Smar measurement solutions for evaporators:
• Clarified Juice Tank Level,
• Juice Temperature,
• Pre-evaporators Level,
• Pre-evaporators Brix,
• Juice Separation into the Several Pre-Evaporators,
• Multiple-Effect Evaporation Boxes Level,
• Juice Flow into the Evaporation Boxes,
• Syrup Brix,
• Vaccuum in the Evaporator,
• Escape of Incondensable Gases from the 3rd and 4th
Trapiche Sugar Mill (Pernambuco, Brazil)
• Condensate Tank Level,
• Motor Command and Interlocking,
• Clarified Juice Temperature,
• Evaporation Tank Body Temperature ,
• Evaporation Tank Calander Temperature,
• Cold Water Temperature at the Multijet Inlet,
• Hot Water Temperature at the Multijet Outlet,
• Evaporation Tank Body Pressure,
• Escape Steam Pressure,
• Vapor Pressure,
• Condensate Conductivit.
For detailed information, access our website: www.smar.
com, or contact us:
Marcus Vinicius M. e Silva
Smar Industrial Equipments Ltd.
+ 55 16 3946 3519
+55 16 9228 4467