Autofrettage in pressure sensors ensures zero-point stability

In the manufacturing operation of pressure sensors, autofrettage denotes the process of active ?overload? by subjecting the pressure sensor selectively once or many times to a pressure above the nominal pressure range. This process is applied, to experience maximum stability, specifically of the zero point, in later operation. Assuming the right design of the sensor, autofrettage enables many years of trouble-free operation of the sensors even at high load cycles achieving the specified overload range, without leading to zero-point shift or similar effects.
In autofrettage, certain local areas of the sensor, where during the selective overload the yield point of the sensor material is locally exceeded, become plasticised, producing a permanent change of the instrumentation characteristics. This selective effect on the structural conditions by means of autofrettage is an integral portion of the development of the sensor and of the associated manufacturing process. Which เพรสเชอร์เกจ is put through and how often, should be determined individually for every sensor design by means of a complicated FEM simulation and extensive test series.
Caution ? no experiments of your! However, it should not be concluded that every sensor will automatically reap the benefits of subjecting it to autofrettage. Autofrettage can only be utilized for ductile materials, but under no circumstances for brittle ones. Conditioning should be scheduled and completed very selectively sufficient reason for great care through the production stages. Ill-considered ? pressure gauge 10 bar ? of pressure sensors by laymen who like experimenting can not only damage the sensor permanently, but additionally bring about dangerous preliminary damage and subsequently possibly in accidents due to fatigue and bursting of the sensor. In this way, an improvement in instrumentation is only going to be achieved, if, by hit or miss.

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