Level control of liquid substances, particularly suitable for use on tanks and/or purification plants as well as sewage channels, wastewater, discharges from septic tanks, industrial waters, and others, provided that they are free from sedimentation and compact stratifications that could prevent the float switch from the movement. Particularly suitable for those situations where there may be frequent excursions in the temperature between 4° and 60° C. The “TITANIO” float switch consists of a mono-block external body made of pressure-blown polyethylene, equipped with an internal counterweight placed in the cable outlet area, a 16(4) Ampere 250 Volts 50/60 Hz switch positioned centrally on its own watertight chamber obtained in mono-block polypropylene body sealed by over-moulding with injection of material of the same type. This chamber, being inserted in the “external body” and subsequently sealed in the interspace with two-component closed-cell expanded material, itself capable of creating, in addition to high thermal insulation, a barrier against infiltration, allows us to consider that the float both made with triple chamber protection