Similar to the company’s existing products, the stainless steel media-isolated SPM 401 series employ a microelectromechanical system (MEMS) sensor design using an etched silicon sensor diaphragm with piezoresistive sensing elements. A thin stainless steel diaphragm isolates the MEMS sensor from harsh media and oil conveys the pressure to the silicon structure.
In contrast, the CPM 602 sensors have a ceramic sensor that is inherently more tolerant of harsh chemicals. The piezoresistive Wheatstone bridge is printed on the side of the ceramic diaphragm that is not exposed to the medium to be measured. Based on the sensor’s solid construction, they are essentially not affected by clamping forces after mounting.