INTRINSICALLY SAFEPT4400 intrinsically safe pressure sensors use a media-isolated, stainless-steel diaphragm for use in pneumatics, water treatment, hydrogen storage, hydraulic systems, oil and gas, and HVAC/R. It is classified as UL/cUL 913 (CSA 157), Class I, Div. 1, Groups C and D when installed with an approval barrier. Pressure ranges are up to 10000 psi with burst pressure up to 20000 psi.