MECHANICAL POLYTECHNIC

All Mechanical Subject study,notes,Syllabus,Sample Question Papers,Previous Question Papers,Circulars,jobs,News,

  • Home
  • SYLLABUS
    • G Scheme
    • I Scheme
  • Previous Question Paper
    • G Scheme
    • E Scheme
  • MSBTE model answer paper
  • MSBTE Sample question Paper
  • Question Banks
  • About Admission Procedure
  • Important student notice
  • Important faculty Notice
  • Home
  • Basic
    • Physics
    • Chemistry
    • Basic Communiction
  • Design
    • Applied Mechanics
    • Strength of Material
    • Theory Of Machine
  • Thermal
    • IC engine
    • Power Engineering
    • Measurement And Control
    • Thermal Engineering
  • video and ppt links
  • list of mechanical polytechnics
  • Polytechnic Faculty Jobs
  • Faculty Formats
  • Online Exam MCQ
    • Management
    • EST
  • Students job Advertisement

Humidity Measuremeter

 Add comments about this   

Humidity contain of water vapour in air or other gas. Water vapour is the gaseous form of water, and can be thought of much like any other kind of gas. It is normally transparent
Humidity is the term for the amount of water that is contained in gaseous environment. With most cases, measurement of humidity is for an air environment at atmospheric pressure and ambient or raised temperatures.
Humidity measuring devices:
Hygrometers:
Devices that indirectly measure humidity by sensing change in physical or electrical properties in materials due to their moisture content are called hygrometers.
Materials such as hair, skin, membranes, and thin strips of wood change their length as they absorb water. The change in length is directly related to humidity.
Such devices are used to measure relative humidity from 20 to 90 percent, with accuracies of about + - 5%. Their operating temperature range is limited to less then 700 C.
HAIR HYGROMETER
Hair hygrometer is the simplest and oldest type of hygrometer.
As the relative humidity increases, hair becomes longer, and as the humidity drops it becomes shorter. On very humid days, your hair actually becomes longer and this extra length cause the fizziness that gives us bad hair days.
Human hair lengthens by 3 percent when the humidity changes from 0 to 100 percent, this property of hair can be used to operate a pointer or recording pen through a system of mechanical linkage.
The transducer element consists of strands of hair which are generally arranged parallel to each other.
This instrument uses strands of human or horse hair with the oils removed attached to levers that magnify a small change in hair length.

Advantages
·         Simple in construction.
·         Low cost.
·         Simple In operation.
Disadvantages
·         They are not as accurate as other kinds of hygrometers such as the SLING PSYCHROMETER.
·         It needs frequent adjustment and calibration.
·         It also tends to have large errors at very high and very low relative humidity.
 

 
  • Share This:  
  •  Facebook
  •  Twitter
  •  Google+
  •  Stumble
  •  Digg

Related Posts:

  • THERMISTOR Thermistor are a temperature measurement device that has a negative temperature coefficient. As the temperature increases the resistance decreases an… Read More
  • Characteristics of the instrument 1)static characteristics: Accuracy: is how close is the measurementto the true value.   Percentage error = (( indicated value –true value … Read More
  • Liquid In glass Thermometer PRINCIPLE:- The thermometer is a simple , portable manually operated instrument which may be used for measurement of a temperature . TYPES OF… Read More
  • Thermocouple For Temperature Measurement  A thermocouple is a device made by two different wire joined at one end called junction end or measuring end. The two wire are called thermo e… Read More
  • Bimettalic Thermometer A Bimetallic thermometer consists of bimetallic strip . Bimetallic strip consist of two pieces of different metals firmly bonded together by welding… Read More
Newer Post Older Post Home

0 comments:

Post a Comment

This website is copyrighted.

Breaking News

we will come soon site is under construction thank you

Popular Posts

  • MSBTE Academic Monitoring D Forms
    D1            D11 D2            D12 D3            D13 D4            D14 D5            D 15 D6            D16 D7            D1...
  • MSBTE Model Answer Paper
    I Scheme Syllabus First sem Second Sem Third Sem Fourth Sem Fifth sem Sixth Sem Basic Mathematics Applied Science SOM ................
  • List Of Polytechnic Colleges in Maharashatra
    Pune region Polytechnic Colleges Government Polytechnic Pune     Babasaheb Phadtare Polytechnic Bharati Vidyapeeth’s ...

Recent Posts

Unordered List

Pages

  • Home

Text Widget

Blog Archive

  • July 2018 (49)
  • June 2018 (6)
Powered by Blogger.

Report Abuse

Contact Form

Name

Email *

Message *

Search This Blog

Subscribe

Recent Posts

Recent Posts

Text Widget

Sports

Advertise Here

Services

Vision

We Try to simplify the complex things in to the simple manner on the level of Students Grasping Capacity.Our Main Aim to create the strong and Competent Successful Mechanical Engineers

Copyright © 2025 MECHANICAL POLYTECHNIC | Powered by S.M
Design by Mechanical Polytechnic | Blogger Theme by Mechanical Polytechnic | Distributed By Website Team