Hydrogen Permeation Pressure Sensor

Makes some metals more likely to crack and fracture hydrogen embrittlement.

Hydrogen permeation pressure sensor.

Due to hydrogen permeation into the sensor structures signal drift can occur over time. This separation occurs under specific process conditions commonly under high pressure and high temperature. Pressure sensor not visible here pressure relief device thermal in tank gas temperature sensor carbon composite shell structural impact resistant outer shell damage resistant gas outlet solenoid foam dome impact protection high molecular weight polymer liner gas permeation barrier compressed hydrogen type iv storage. Hydrogen atoms are extremely tiny and because of this property can even penetrate solid materials in a process known as permeation.

A permeation hydrogen sensor for the measurement of the hydrogen partial pressure was developed and built. This is called hydrogen permeation and it does two things in a pressure sensor. The abb transmitter with a h shield coated diaphragm replaced a prematurely failing competitive transmitter with. Two of the most common sensor concerns in hydrogen applications are hydrogen embrittlement and hydrogen permeation.

Hydrogen permeation occurs when hydrogen atoms h 2 split into two separate hydrogen ions h. The new hydrogen permeation sensor based on solid polymer fuel cell technology was evaluated on laboratory and a field prototype was installed in an oil production facility. Abb 2600t pressure transmitters resist hydrogen permeation at canadian refinery project description an abb model 266 pressure transmitter with remote seals has successfully resisted hydrogen permeation at our customer s premises. With the gold coating 0 1 to 1 μm of a 50 μm steel membrane hydrogen permeation can be suppressed significantly more effectively than by doubling the membrane thickness to 100 μm.

First sensor is on board with high and medium pressure sensor solutions for fuel cell cars. Changes its electrical resistance which leads to signal drift. In piezoresistive pressure transmitters the sensor chip is enveloped in a fluid usually oil. Over time pressure transmitters become inoperative due to this process.

Their lifespan can however be optimized. Hydrogen permeation is the diffusion of hydrogen ions through the thin metal isolation diaphragms used in pressure transmitters either through interstitial or substitutional vacancy mechanisms. It is in contact with the measurement gas and connected to a pressure sensor. To prevent hydrogen permeation a pressure sensor can have a gold plated flush diaphragm membrane.

The time until the occurrence of a relevant signal drift and the extent of the signal drift depends mainly on factors such as the temperature of the hydrogen hydrogen content in the medium and the diaphragm thickness of the pressure sensor used.