The SIHIdry was developed in order to operate with explosive media,both internally and externally.Consequently,it was the first
vacuum pump to be accredited with ATEX 100a.Moreover,the formal
risk assessment indicated that it is possible to use this pump as an
ATEX Category 2 machine without flame arresters and their associated problems.
The SIHI range of dry running vacuum pumps is availiable with ATEX Category 1,T4 internal certification for use with Zone 0 explosive
media.Interestingly,ATEX Category 2,for use with Zone 1 explosive media is possible without the need to fit flame arresters.