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All posts by Stefan Heusel

SIL? PL? What is the probability of failure of a safety function?

Stefan Heusel | Know-how
table: SIL safety integrity level

Customers often ask us: “Can my product be part of a safety function? Which standards or directives apply in this case?” The most important safety directives and standards available today are SIL (Safety Integrity Level) and PL (Performance Level). These …

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Fields of application for pressure sensors 4 – summary

Stefan Heusel | Know-how
illustration: relative and absolute pressure

In previous articles about the fields of application of different pressure sensors, I have described the special features of the different versions. Pressure range and ambient conditions are decisive when selecting a suitable sensor for a problem to be solved. In …

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Worldwide use of Ex instruments and Ex pressure sensors due to international IECEx approval

Stefan Heusel | Know-how
ATEX and IECE protection

Pressure sensors and electronic devices may only be used in hazardous areas if they have been tested and approved by a recognised authority in terms of their explosion protection features. So far, this was mostly carried out by a national institution which, after …

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When does a sensor modification require changes to the approval?

Stefan Heusel | Know-how
intrinsically safe sensor?

Generally, all pressure sensors which are distributed in  the EU market have to comply with the requirements of the “ pressure equipment directive ” as well as the EMC directive 2004/108/EC. Depending on the application or location of operation, a variety of …

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What does “adiabatic compression” mean and what is a pressure-surge test?

Stefan Heusel | Know-how
arrow with flames

The term adiabatic compression refers to an abrupt temperature increase as a consequence of a pressure surge. Such temperature increases occur in gaseous media, when the thermal energy which is released due to a change in pressure cannot be passed on to the environment …

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Welcome to the WIKA blog

In our English-language blog you can expect many interesting articles on pressure, temperature, level, force and flow measurement, and also on the subject of calibration technology. Furthermore, there are various insights into the world of the WIKA group of companies – seen from different angles.

Most-read articles
  • Difference between gauge pressure and absolute pressure measurement

  • Pt100 in 2-, 3- or 4-wire connection?

  • Differences between G1/4″ threads

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