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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.