Electrical switches and sensors which use a non-toxic liquid...

Details Electrical switches and sensors which use a non-toxic liquid... Electrical switches and sensors which use a non-toxic liquid...

H - Electricity

01

H

H01H 29/06 (2006.01) B65B 31/00 (2006.01)

Patent

CA 2153662

Liquid gallium or gallium alloy (10) is utilized as the conductive fluid in a switch or sensor housing (12). In order to prevent wetting of the interior walls of the switch or sensor housing (12), the liquid gallium or gallium alloy (10) is either free of metal oxides or has only very low quantities of metal oxides. The gallium or gallium alloy (10) may be kept free of oxides by treating it with an acid, a base or a reducing agent and may be prevented from forming oxides during and after dispensing by removing air from the switch or sensor housing (12). An inert gas, such as argon, helium or hydrogen may fill the remainder of the housing (12) after the gallium or gallium alloy (10) has been dispensed. The gallium alloy may comprise indium, tin and/or bismuth.

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