P611 and P621 pressure transmitters feature a single-piece, 316L stainless steel sensing element with a high-output, silicon glass-fused strain gauge, coupled with a thick diaphragm to maximize cycle life even in the presence of pressure spikes, vibration and aggressive fluid media. The 316L sensor is welded to a 316 stainless steel body and has no O-rings or seals for leak-proof reliability.