AST H2 – Pressure Transmitter for hydrogen applications

AMSYS GmbH & Co. KG, May 2024 – With the AST2000 and AST4000, AMSYS offers two variants of a pressure transducer specially certified for applications with hydrogen. With the EC79 certificate, these pressure sensors are suitable for use in fuel cells, hydrogen storage tanks and filling stations. The sensors are made from a single piece of stainless steel without oil filling and welded seams to prevent inclusions and leaks from the outset.

With 4 ... 20 mA current and two different voltage outputs (1 ... 5 V / 0.5 ... 4.5 V ratiometric), the pressure transducers are versatile and can be used in both stationary and mobile applications. They measure relative pressures between 0 and 448 bar with an accuracy of +/-0.25%.

The IP66-protected transmitters are suitable for a wide temperature range of -0 ... 85°C, shock-resistant in accordance with EN60067 and vibration-resistant in accordance with EN60068. EMC compatibility has been confirmed by measurements in accordance with EN61000. However, its greatest advantage is its conformity with EU Regulation EC79 for use in hydrogen-powered vehicles.

For this purpose, the pressure diaphragm, including the threaded mount, is precision machined from a single piece of AISI 316L stainless steel. With a burst pressure of over 2200 bar, this design eliminates the need for weld seams, which always represent a potential weak point and a possible leak for the very small H2 molecules. As there is no pressure equalization via an oil-filled cavity as with many other precision transmitters with stainless steel diaphragms, no hydrogen can diffuse into this unventilated cavity.

For industrial applications, AMSYS offers the AST2000 (former American Sensor Technology, now TE Connectivity), a comparable pressure transmitter also made of AISI 316L for a variety of pressure ranges between -1 ... 2 bar and 0 ... 700 bar with several output signals and electrical connections.

As a distributor for sensor technology, AMSYS is one of the specialists in pressure measurement technology on the German-speaking market for TE Connectivity sensors.

Features 

• EC79 compliant
• Monolithic design without weld seams 
• Wetted material: AISI 316L stainless steel 
• Absolute pressure range: 0 - 448 bar 
• Temperature range: -40..+85 °C 
• Accuracy: +/-0.25 %FS, TEB: 1% FS 
• Test pressure: 896 bar
• Burst pressure: 2240 bar 
• Outputs: 4 ... 20 mA, 1 ... 5 V or 0.5 ... 4.5 V (ratiometric)

Company

AMSYS GmbH & Co. KG is a medium-sized company based in Germany and has focused on the field of sensor technology since its foundation. As a distributor for sensor technology, AMSYS is one of the specialists in pressure measurement technology on the German-speaking market.

The AMSYS product range extends from piezoresistive pressure measuring cells to simple SMD mountable transducers, amplified/unamplified and calibrated OEM sensors, PCB modules and ready-to-use pressure transmitters.

AMSYS offers sensors and pressure measuring cells in the pressure range from 25 Pa up to 800 bar. In addition to a wide variety of pressure sensor types, AMSYS also offers OEM humidity sensors, temperature and inclination sensors, as well as wireless radio solutions.

Thanks to the technical expertise of the employees and the good contact with suppliers, customer-specific modifications of standard products can also be offered, making individual problem solutions possible. Further information can be found at www.amsys.de.