The European extruder safety standard (EN 1114-1) specifies that parts subject to over-pressure shall be protected by sensing systems capable of providing the highest safety performance. This performance level refers to EN ISO 13849-1, which states as one of the main safety requirements that  all pressure generating systems shall be switched off via the control systems.
The Italian company Gefran (www.gefran.com) has introduced the Impact series of melt pressure sensors onto the market, meeting this requirement. In December 2010, Gefran, with headquarters in Brescia and branch offices in 11 countries, obtained certification for its Impact sensors from the Notified Body TÜV Rheinland.