Previous generations of piston provers utilized mercury, a known hazardous fluid, as a low friction seal to allow zero gas leakage past the piston. These piston provers were designed in a time when mercury was considered less dangerous. Many healthcare and manufacturing facilities have removed mercury containing products as well as introduced non-mercury containing alternatives. Companies are moving away from mercury containing products because of the concern for worker safety. Regulation frameworks are in place to continue to remove hazardous materials, including mercury, from products and facilities.
One example is RoHS requirements from the EU will require medical devices and monitoring control equipment shipped after July 2014 to not contain mercury, http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2011:174:0088:0110:en:PDF.
Another example is that the US has legislated an export ban on mercury beginning in January 2012, http://www.gpo.gov/fdsys/pkg/PLAW-110publ414/pdf/PLAW-110publ414.pdf. Mercury is considered a hazardous material by the US EPA, http://www.epa.gov/mercury/, and is regulated by the Toxic Substance Control Act, Clean Air Act as well as the Clean Water Act.
Bios DryCal® gas flow calibrators do not contain mercury. In addition Bios DryCal units can provide the same and in some cases better accuracy and reliability than the mercury containing piston provers Bios DryCal units replace.
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