P&IDs contain instrumentation.  Instrumentation is the technology of using instruments to measure and control the physical and chemical properties of materials.
When the instruments are used for the measurement and control of industrial manufacturing, conversion, or treating processes, the term Process Instrumentation is applied. And When the measuring and controlling instruments are combined so that measurements provide impulses for remote automatic action, the result is called a Control System.

It isn't always possible to measure or control the properties of a material directly by instruments. This makes it necessary to deal with variables that affect these properties, such as Temperature, Pressure, Level, Flow, Humidity, Density, Viscosity, and so on.


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Text Box: P&IDs—From The Drafter’s Perspective
Guide To Drafting Piping and Instrumentation Diagrams

P&ID Components—Instrumentation Items

P&IDs - From The Drafter’s Perspective—Guide for Drafting Piping and Instrumentation Diagrams

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Links to General Instrumentation Information


PIP PIC001 Sample


Instrumentation Info


General P&ID Instrument Symbols  Lesson


Instrument Identifiers


Sensing Devices and Detectors


Modifiers and Transmitters


Indicators and Recorders


Examples of Simple Instrument Loops


CADCell Instrument and Electrical Symbols


Instrumentation Info 2  Go To Page 54—59


Instrumentation on P&IDs


Safety Valves


Safety Relief Valve and Rupture Disk Video


Miscellaneous Valve Info




Principles of Instrumentation and Process Control Video


What is Instrumentation? Video


Analyzer Instrumentation Course


The History of Measurement Tools—Article



Links to Control Valve Information


Control Valves


Control Valves 2


Control Valve Technology Library


Solenoid Valve Definition


How Solenoid Valves Work  Video


Solenoid Valves How The Work Video


Programmable Logic Controller (PLC)


Control Valve Handbook


Piping and Instrumentation Diagrams Tutorials III: Flow and Level Control


Links to Flow Instrumentation Information


Flow Sensors


Flow Meters


Types of Flow Meters


Flow Measurement


Types of Flow Measurement  Lesson


Back to Basics—DP Flow Measurement—Video


Flow Meter Animation Video


Flow Meter Electromatic Explained Video


Flow Meter Vortex and Swirl Video


Flow Meter—Vortex  Lesson


Flow Meter Mass Video


Flow Meter Variable Area Video


Flow Measurement Video


Flow Measurement—Electromagnetic Video


How Does Volumetric Flow Meter Work Video


Flow Meters - Ultrasonic  Lesson


Flow Meters—Thermal  Lesson


Flow Meter Technology Library


Electronic Flow Measurement Video


Types of Fluid Flow Meters


Differential Pressure Flow Meter Explained—Video


Orifice Plate Theory—Video


Differential Pressure Flow Measuring Principle  (Orifice-Nozzle-Venturi) - Video


Pressure Based Flow Meter—Venturi Tube


Flow Rate Calculation through Orifice Plate


Types of Flow in Pipes


Variable Area Flow Meter


Introduction to Variable Area Flow Meters


Turbine Flow Meters


Turbine Flow Meters Vs. Oval Gear Flow Meters—Video


Vortex Flow Meter—Tutorial


Flow Meter Piping Requirements


How To Measure Flow Using A Magnetic Flow Meter


Electromagnetic Flow Meters Explained—Video


Inertia Based Mass Flow Meter


Mass Flow Meters Explained—Video


The Coriolis Flow Measuring Principle—Video


The Key Advantage in Thermal Mass Flow Meter Performance


The Thermal Flow Measuring Principle—Video


Thermal Mass Flow Measurement—The Smart Way—Video


How Positive Displacement Flow Meters Work


Positive Displacement Flow Meters


Weigh Feeder Principles of Operation


Weigh Feeder Flow—Video


Magna Weigh Feeder—Video


ABB Flow Meter Videos


The Flow Forum

Links to Level Instrumentation Information


Level Control Valve


Level Sensors—Displacement  Lesson


What is Liquid Level?  Video


Basics of Level Measurement—Video


Level Sensors


Level and Weighing Instruments Technology Library


20 Kinds of Liquid Level Measurement—Article


Level Measurement for the Power Industry—Article


Level Instrumentation and Tank Gauging Video


Purge Level Measurement Method  Lesson


Basics of Level Measurement Video


Echo Level Measurement


Non-Contact Level Measurement


Laser Level Transmitter


Digital Laser Level Sensor


Laser Level Transmitter


Lasers Come To Level Measurement—Article


Weight Level Measurement Sensor


Yo-Yo Weight Level Measurement


Capacitive Level Sensor


Capacitance Level Measurement—Video


Radiation Based Level Gages


Radiation Based Level Detector



Links to Pressure  Instrumentation Information


Pressure Instruments Technology Library


Pressure Controllers


How Pressure Gauges Are Made Video


Pressure, Force and Torque Sensors Video


Pressure Measurement in Inches of Water Column  Lesson


Pressure Transmitters and Transducers


Pressure Safety Valves Video


Pressure Relief Valve Video


Pressure Measurements Lesson


Differential Pressure Transmitter Used To Measure Flow Video


Types of Pressure Course



Links to Temperature Instrumentation Information


Temperature Instrumentation Video


Temperature Sensors


Temperature Measuring Instruments


Classification of Temperature Sensors


Temperature Detector—Resistance—RTD  Lesson


Temperature Measurement Video


Temperature Transmitters


Temperature Controllers


Temperature Instruments Technology Library


Thermocouples  Lesson


Bimetal Thermometers and Thermostats


Bimetalic Temperature Sensors


Bimetal Temperature Sensor with Local Readout


Filled System Thermometers


How Does A Thermometer Tell The Temperature? - Article


What is an RTD?


Measuring Temperature with an RTD or Thermistor


Temperature Sensor—The Thermistor


Types of Thermocouples


How Thermocouples Work


Optical Temperature Sensor


Thermal Imaging Sensor—Demo


Temperature Measurement Dialog—Video