Inst ToolsInst ToolsInst Tools
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
      • Instrumentation
      • Electronics
      • Electrical
      • Practical Questions
    • MCQ
      • Instrumentation MCQ
      • Electrical MCQ
      • Electronics MCQ
      • Control Systems MCQ
      • Analog Electronics MCQ
      • Digital Electronics MCQ
      • Power Electronics MCQ
      • Microprocessor MCQ
      • Multiple Choice Questions
  • EE
    • Electronics
      • Electronics Q & A
      • Electronic Basics
      • Electronic Devices & Circuits
      • Electronics Animation
      • Digital Electronics
    • Electrical
      • Electrical Basics
      • Electrical Q & A
      • Power Electronics
      • Electrical Machines
      • Electrical Animation
      • Power Systems
      • Switchgear & Protection
      • Transmission & Distribution
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Search
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Reading: Hair Hydrometer Principle
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • PLC Tutorials
  • Control Systems
Search
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
    • MCQ
  • EE
    • Electronics
    • Electrical
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Analyzers > Hair Hydrometer Principle

Hair Hydrometer Principle

Last updated: May 19, 2019 2:46 pm
Editorial Staff
Analyzers
No Comments
Share
2 Min Read
SHARE

Due to humidity, several materials experience a change in physical, chemical and electrical properties. This property is used in transducer that are designed and calibrated to read relative humidity directly.

Contents
Description of Hair HydrometerOperation of Hair HydrometerApplications of Hair HydrometerLimitations of Hair Hydrometer

Hair hydrometer is a type of absorption hydrometer and uses the mechanical humidity sensing technique.

Certain hygroscopic materials such as human hair, animal membranes, wood, paper, etc., undergo changes in linear dimensions when they absorb moisture from their surrounding air. This change in linear dimension is used as the measurement of humidity present in air.

Description of Hair Hydrometer

The main Parts of hair hydrometer are,

Hair Hydrometer Principle

Human hair is used as the humidity sensor. The hair is arranged in parallel beam and they are separated from one another to expose them to the surrounding air/atmosphere. Number of hairs are placed in parallel to increase mechanical strength.

This hair arrangement is placed under small tension by the use of a tension spring to ensure proper functioning.

The hair arrangement is connected to an arm and a link arrangement and the link is attached to a pointer pivoted at one end. The pointer sweeps over a humidity calibrated scale.

Operation of Hair Hydrometer

When the humidity of air is to be measured, this air is made to surround the hair arrangement and the hair arrangement absorbs the humidity from the surrounding air and expands or contracts in the linear direction.

This expansion or contraction of the hair arrangement moves the arm & link and thus the pointer to a suitable position on the calibrated scale and thus indicating the humidity present in the air/atmosphere.

Note: These Hair hydrometers are called membrane hydrometers when the sensing element is a membrane.

Applications of Hair Hydrometer

  • These hydrometers are used in the temperature range of 0’C to 75’C.
  • These hydrometers are used in the RH (Relative Humidity) range of 30 to 95%.

Limitations of Hair Hydrometer

  • These Hydrometers are slow in Response
  • If the Hair hydrometer is used constantly, its calibration tends to change.
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 !
Conductivity Transmitter Calibration Procedure
Pulsed Fluorescence SO2, H2S, CS Analyzer Working Principle
Dew Point Meter Principle
Four Electrode Conductivity Probes Principle
Analyzer Sample Systems
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
208kSubscribersSubscribe
38kFollowersFollow

Categories

Recent Comments

  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • MIHARITSOA Aina Sitraka on Top Non-PLC Certification Courses for Automation Professionals
  • Vaishnavi on Free Instrumentation Course for Trainee Engineers

Related Articles

Analyzer Sampling System

Gas Analyzer Sampling System

Infrared Flue Gas Analyser

What is Infrared Flue Gas Analyzer? – Working Principle

Ph Meter Principle

pH measurement

Dual-beam non-dispersive analyzer

Dual-beam Non-dispersive Analyzer

Various Types of Sensors Used in Water Treatment Plant

Various Types of Sensors used in Water Treatment Plant

Technologies for Oxygen Gas Measurement

Technologies for Oxygen Gas Measurement

Measurement of Carbon Dioxide in Flue Gas

Measurement of Carbon Dioxide in Flue Gas

Analyzer chopper wheel

NDIR Analyzer Filter Cells

More Articles

Feedback Characteristics of Control Systems

Linear Approximation of the Non-Linear System MCQ

PLC Program for Conveyor Motor

PLC Conveyor Motor Ladder Logic

Thermocouples Burnout detection

Thermocouples Burnout detection

Thermocouple Calculations

Free Download Thermocouple Calculator

Design & Construction of Process Plant

Process Control Systems Philosophy Concept

Procedure For reading or searching the tag number in Siemens PLC

Procedure for Reading or Searching the Tag number in Siemens PLC

Turbine Flowmeter Parts

What is a Turbine Flow Meter?

Functional block diagram for analog alarms

PLC Logic for Analog Alarms using Functional Block Diagram

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?