Processing Magazine

Pressure sensors approved for Hydrogen pressure measurement in hostile environments

September 3, 2009

This digitally compensated pressure sensor has the accuracy and construction to meet the expectations of the Hydrogen pressure measurement market. The sensor is packaged with an SAE-3 or SAE-4 pressure port, 0.5-4.5V Ratiometric output signal, Packard Metripack 150 electrical connection and optional 1% total error band. This pressure sensor is designed for applications including, but not limited to PEM fuel cells, on-board vehicle cylinder pressure measurement, hydrogen regulator pressure measurement, hydrogen filling stations, hydrogen storage containers and test stand equipment. The sensor features the manufacturer’s patented technology pressure sensing element. The thread, hex and diaphragm are all machined from one piece of 316L SS, eliminating the risks associated with other sensor technologies including media compatibility, weld failures, and contamination through an oil-filled cavity. The sensor was tested to the TUV compatibility standard created by the EIHP (European Integration Hydrogen Program) for Compressed Hydrogen Gas (CGH2) components for on-board vehicle storage systems. The sensor pressure sensors passed all tests including media compatibility, aging, corrosion resistance, endurance testing, pressure cycling, leakage testing, isolation, noise compatibility, and hydraulic strength. The thick diaphragm of the 900 bar (13,053.4 PSI) pressure sensors not only held the 1,800 bar burst pressure test, but also continued to operate above 2,400 bar until the O-ring extruded.