Home  Glossary  Resources  
 

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


Glossaries
 

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

ControlAndInstrumentation.com

© Copyright 2006 - 2017. All rights reserved.