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RoHS covers the restrictions on the use of six highly toxic materials (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers) in electrical equipment.

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Electrical equipment is segmented into eleven different categories. Oxygen sensors used in industrial safety applications fall under category 9 (Industrial Monitoring and Control Instruments).  This came into the scope of the Directive on 22nd July2017. 

 

Traditional lead-based oxygen sensors incorporate a lead anode.  An exemption is in place for the use of lead anodes in electrochemical oxygen sensors.  This exemption is valid for a maximum of 7 years from 22nd July 2017.

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After this period, lead anodes in electrochemical oxygen sensors will no longer be exempted from the RoHS Directive regulations.  Instruments containing lead-based sensors released after this period cannot be sold or used within EU regions.  Subsequently, there is a requirement for lead-free oxygen sensors for use within EU territories.

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City Technology's Lead-Free Oxygen Sensors