Honeywell Chapter 3

Instrumentation ELC-213Today

Instrumentation and Control SystemsDocumentation

Presentation by Clifford T. Johnson, PE, Control Systems Engineer

Loop Diagrams Chapter 7

Loop Diagrams are most important for technicianstechnicians

Today Assignment & Lab ELC-213

Assignment , Lab & video

Loop Diagrams Control Modes, Proportional. Reset & Rate

Loop Definition ELC-213

These are excepts from the ISA Comprehensive Dictionary ofInstrumentation and Control

page 168 covering LOOP

ISA Definitions

ISA

Loop Diagrams ELC-213

ICSD Chapter 7 Loop Diagrams

A better definition is:A single stand alone device is NOT a loop

ICSD

Loop Identification ELC-213

Instrument Loop Identification

Chapter 7, Pg. 141 details

The P&ID is where the actual loops are defined and

receive their tagging and Loop numbers. The devices

are then entered into the Instrument Index, the the

specification sheet is created, the IOM is received and it would be at this point that

the loop sheet can be developed

ICSD

Loop Symbols ELC-213

Loop Diagram SymbolsInstruments

ISA symbols are generally used to depict Instruments and control devices with the addition

of terminals or ports

Other devicesTanks, piping, etc are left up to the designer and engineer as they

see fit

ICSD

Loop Energy ELC-213

Energy SupplyElectrical, Pneumatic,

and other requirements for operating the

instrumentation and control devices must be clearly identified by the

sources such as electrical breakers and air supplies. Not just

what it is, but where is it coming from.

ICSD

Instrument Action ELC-213

Instrument Action

ICSD

Loop area ELC-213

Loop Diagram Field Area

ICSD

Loop Diagram ELC-213

Loop Diagram most common

ICSD

Complex Diagram ELC-213

Loop Diagram complex

ICSD

SIS Loop Sheet ELC-213

Loop Diagram SIS

Lab

Download from Resources and Fill in Tags, correct the symbols as necessary,

Show actual wiring with numbers and colorsand Fill in Title Block

You must show solenoid operation

Loop diagram ELC-213

Loop Diagram for a fieldbus

FCV-5540-14-S

ZSO554014

AS-i Network No. 1

ZSC554014

SOV554014

F.C.

From V5540 To P-5543

Instr. Air80 psig

FCV554014

2" WWSR

Energize to open

SlaveAddress

24

BRNBLU

BRNBLU

BRN WHT

1 2 3 4

Fieldbus

Loop Diagram ELC-213

Summary: Loop Diagrams1. Next to the the P&ID, the Loop Diagram (or Sheet) is the

most Important document for the Instrument Technician.2. Do not let the contractor create the loop sheets. He does

not have the proper experienced people to do a good job.3. There are a few good Instrument Database software

applications that make the job easier with fewer errors4. Properly developed they will greatly assist the technician

to troubleshoot a control problem.

Cliff T Johnson, PE, Control Systems Engineer Instructor, CPCC, ELC-213 & PCI-162

Summary

Honeywell Chapter 3Modes of Control

Honeywell Chapter 3 ELC-213

Honeywell Chapter 3On-Off ( HVAC)

Honeywell Chapter 3 ELC-213

Honeywell Chapter 3Propotional Band 100%

Honeywell Chapter 3 ELC-213

Honeywell Chapter 3Propotional Band 20%

Honeywell Chapter 3 ELC-213

Honeywell Chapter 3Propotional Band 200%

Honeywell Chapter 3 ELC-213

Honeywell Chapter 3Reset (Integral) Action

Honeywell Chapter 3 ELC-213

Assignment ELC-213

Homework ASSIGNMENT Web Link

Find an example of a Loop Diagram on the web, email web page LINK only to me, do NOT email images or web pages

SubjectSubject::Your last Name-Subject-Assignment Date (AD)

Email subjects Ex:Email subjects Ex: Johnson-LoopLink- Johnson-LoopLink-AD

All Emails Subjects and File names must haveAll Emails Subjects and File names must have

File name Ex:File name Ex: Johnson-Loop- Johnson-Loop- AD.vsd.vsd

You will lose 1-3 points for incorrect subject

Subjects

Instrumentation ELC-213

The End

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