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		Control and Instrumentation Glossary Search for another term in our Glossary        P&ID Piping and Instrument Diagram Further Reading   PCD - Pitch Circle Diameter The diameter of an imaginary circle drawn through the bolt hole centres on a flange; flywheel; coupling etc Further Reading   PDMS Plant Design and Management System Software package used for plant design and creation of 3 dimensional models Further Reading   PED European Union Pressure Equipment Directive (97/23/EC) Further Reading   PES - Programmable Electronic System A system for control; protection or monitoring based on one or more progamable electronic devices. The system comprises all elements e.g. power supplies; sensors; actuators; communication paths etc. Further Reading   PFD Process Flow Diagram Further Reading   PFD Probability of Failure on Demand Further Reading   PID - Proportional Integral Derivative The 3 types of control action making up a 3 term controller. Commonly used for valve control. Further Reading   PLC - Programmable Logic Controller Computer based monitoring and control package where control actions are primarily based on equipment and alarm status. Further Reading   PMS Power Management System Further Reading   Port A communications connection on an electronic or computer based device Further Reading   ppm Parts Per Million Further Reading   Primary Element An element that converts a measured variable into a force, motion or other form suitable for measurement. Further Reading   Profibus Vendor-independent open fieldbus standard increasingly used in process control. Standardised in IEC 61158 and EN50170 Further Reading   PSD Process Shutdown System Further Reading   psi - Pounds per square inch A unit of pressure measurement. If psia then the unit of pressure used when the zero reference is full vacuum and if psig the zero reference is atmospheric pressure. Further Reading   PSU Power Supply Unit Further Reading   PSV - Pressure Safety Valve A spring loaded pressure relief valve actuated by the static pressure upstream of the valve and characterised by rapid opening. Further Reading   PTB (DE) Physikalish Technische Bundesanstalt - Notified Body based in Germany Further Reading		Sponsored Links
Glossary   C&I Glossary Relief Valve Glossary Engineering Glossary Nuclear Glossary   C&I Resources   ATEX Cable Gland Selector CE Marking Flange Dimensions Ingress Protection Pipe Schedules Relief Valve Orifice Size Temperature Class Temperature Conversion Thermocouple Types Valve Leakage Vortex Meters Wires and Cables

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