The operation of immersed electrode humidifiers is based on a very simple physical principle. As common drinking water contains a certain quantity of dissolved mineral salts, and is consequently slightly conductive, applying a voltage to metal electrodes immersed in the water creates an electric current that heats the water until producing steam (Joule effect).
The quantity of steam produced is proportional to the electric current, which is in turn proportional to the level of water. This electric current is measured by a current transformer: by varying the level of water using a fill and drain electrovalve, the current, and consequently the steam production, can be precisely modulated. Due to evaporation, the level of water decreases and must therefore be topped up.
As the steam does not carry minerals, the salt concentration in the water and therefore the conductivity increases, meaning that the water has to be periodically diluted by draining part of it using the drain solenoid valve and replacing it with fresh water. In addition, lime scale is deposited over time and covers part of the cylinder, which must be replaced or cleaned.
The principle is simple, however the development of an immersed electrode humidifier that ensures safe operation and reliability over time requires careful analysis and extended testing. Compared to the complementary immersed element heater or gas humidifiers, immersed electrode humidifiers:
• are less expensive to purchase;
• operate with drinking water (not completely demineralised or softened);
• require the periodical replacement (or cleaning) of the cylinder;
• feature modulation suitable for comfort or industrial applications, without extreme requirements.

Applications

Offices
Printing
Food processing
Computer rooms and telephone exchanges
Defence
Photography
High Tech microchip manufacturing
Woodworking
Museums
Well-being and comfort
bakery and blast freezing

ADVANTAGE

• AFS system (Anti Foaming System): detects foam to prevent the release of droplets together with the steam;

• large cylinders with galvanised electrodes and anti-scale filter on the bottom, for longer maintenance-free operation. Openable and fireproof cylinders are also available;

• steam production with continuous modulation from 20% to the max. flowrate (from 10% for the models with two cylinders);

• built-in conductivity sensor and control software to optimise energy efficiency and operating life, with constant performance over the life of the cylinder;

• choice between controllers: “Y” (proportional or ON/OFF from external controller and icon-based display); “X” (modulating with built-in controller based on pCO technology and alphanumeric and graphic display with extended messages),“W” (similar to the “X” controller, however designed for steam baths);

• model “X” manages a second “limit” probe to reduce production and prevent any condensate forming in the air duct.