Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Flame Ionization Detector (FID) Principle
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Analyzers > Flame Ionization Detector (FID) Principle

Flame Ionization Detector (FID) Principle

Last updated: November 15, 2018 9:37 am
Editorial Staff
Analyzers
No Comments
Share
2 Min Read
SHARE

Several different detector designs exist for process gas chromatographs. The two most common are the flame ionization detector (FID) and the thermal conductivity detector (TCD). Other detector types include the flame photometric detector (FPD), photoionization detector (PID), nitrogenphosphorus detector (NPD), and electron capture detector (ECD). All chromatograph detectors exploit some physical difference between the solutes and the carrier gas itself which acts as a gaseous solvent, so that the detector may be able to detect the passage of solute molecules (sample gas components) among carrier molecules.

Also Read : GC Detectors Questions & Answers

Flame Ionization Detectors

Flame ionization detectors work on the principle of ions liberated in the combustion of the sample species. Here, the assumption is that sample compounds will ionize inside of a flame, whereas the carrier gas will not. A permanent flame (usually fueled by hydrogen gas which produces negligible ions in combustion) serves to ionize any gas molecules exiting the chromatograph column that are not carrier gas. Common carrier gases used with FID sensors are helium and nitrogen, which also produce negligible ions in a flame. Molecules of sample encountering the flame ionize, causing the flame to become more electrically conductive than it was with only hydrogen and carrier gas. This conductivity causes the detector circuit to respond with a measurable electrical signal.

A simplified diagram of an FID is shown here:

Flame Ionization Detector (FID)

Hydrocarbon molecules happen to easily ionize during combustion, which makes the FID sensor well-suited for GC analysis in the petrochemical industries where hydrocarbon composition is the most common form of analytical measurement. It should be noted, however, that not all carboncontaining compounds significantly ionize in a flame. Examples of non-ionizing organic compounds include carbon monoxide, carbon dioxide, and carbon sulfide. Other gases of common industrial interest such as water, hydrogen sulfide, sulfur dioxide, and ammonia likewise fail to ionize in a flame and thus are undetectable using an FID.

Also Read : GC Principle

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Absorption Type Optical Analyzer
Sox Nox Analyzer
Total Organic Carbon Analyzer Principle
Troubleshooting pH Analyzer Common Problems
Ammonia Analyzer Principle
How to Calibrate the Eddy Current Conductivity Meter?
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Gas Analyzers Interview Questions and Answers
Specific Conductance Calibration Procedure
Pulsed Fluorescence SO2, H2S, CS Analyzer Working Principle
Gas chromatograph Working Animation
pH Analyzer Do’s and Don’ts
Basics of ORP Measurement
Humidity Measurement Principle
Chemiluminescence

Keep Learning

process chemical analyzer calibration

Automated Calibration

Analytical Instrumentation Engineering Projects

Top 100 Analytical Instrumentation Engineering Projects

Analyzer chopper wheel

NDIR Analyzer Filter Cells

Oxygen Analyzer Principle

Oxygen Analyzer Working Principle

online silica analyzer

Silica Analyzer Problems and Troubleshooting Tips

GC sample loop

Chromatograph Sample Valves

sulfur dioxide analyzer

Fluorescence

Ionization chamber Working

Ionization chamber Principle

Learn More

WHILE DO Statement in SCL Language

WHILE DO Statement in SCL Language

Intrinsic semiconductors

Introduction to Semiconductor Electronics – Types, Materials

Torque Tube Level Measurement Principle

Torque Tube Level Measurement Principle

Power Electronics Objective Questions

Inverters Quality Objective Questions

PLC Program for Car Parking

PLC Program for Entry and Exit Control of Car Parking

Tagging Philosophy for Junction Box

Tagging Philosophy for Junction Box, Cable, and Cable Drum

How Weigh Feeder Works

How Weigh Feeder Works ?

Smart Transmitter Calibration Tutorial Part 3

Smart Transmitter Calibration Tutorial Part 3

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?