A pressure sensor device for producing a signal indicative of a pressure of a fluid to be monitored, including a housing having a fluid conduit for receiving the fluid to be monitored and a diaphragm positioned at an end of the fluid conduit. In at least one embodiment, the device needs to be able to access the unique value across processing system resets, and the device does not have sufficient non-volatile storage to store the unique value itself. Further, a three-phase AC motor may be utilized, and the pulses in its power supply monitored to determine an obstruction in the path of the closure. The present invention easily and precisely achieves the optimal velocity-pressure switching parameters to facilitate better pressure holding ability to increase the quality of the plastic products. The teaching signal can be approximated online by a fuzzy controller that operates using knowledge from the knowledge base. In some embodiments, the methods are carried out in the presence of a catalyst comprising an electrophilic halogen.