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

 

Transmitters

 

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