![Page 1: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/1.jpg)
Presented By :
Tejas Atyam
4th sem Production
![Page 2: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/2.jpg)
Common Sources of Errors are:
Ambient temperature Effect
Head or Elevation Efffect
Barometric Effect
Immersion Effect
Radiation Effect
![Page 3: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/3.jpg)
The effect taking place due to the
exposure of the bourdan tube and the
capillary tube to the surroundings .
Being exposed to the surroundings causes
them to be subjected to variable temp.
widely different to that of the bulb .
![Page 4: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/4.jpg)
Using Large Bulb :
From the equation we can clearly see that
the use of a larger bulb will reduce the
error
Case Compensation :
A bimetallic strip or secondary bourdan
tube is used to counter the deflection in
the main bourdan tube in the opposite
direction .
![Page 5: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/5.jpg)
Full Compensation :The only new difference id that even a capillary tube has been attached to counter the effects .
Using Self Compensating Capillary :In this case the cross section of the capillary is made into a annulus which has a special alloy wire in its whole length to counter the capillary expansion.
![Page 6: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/6.jpg)
![Page 7: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/7.jpg)
![Page 8: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/8.jpg)
![Page 9: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/9.jpg)
![Page 10: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/10.jpg)
This is the error caused due the elevation
of the bulb from the level of the bourdan
tube . Due to the difference in height a
pressure head is created which causes
error in the temperature reading .
![Page 11: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/11.jpg)
![Page 12: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/12.jpg)
The tip travel of bourdon tube is due to
pressure difference between atmosphere
and filled system pressure . So if there is
any variation in atmosphere pressure from
designed pressure , the bourdon tip travels
and causes an error reading .
The equation shown by me is used to
calculate the error .
![Page 13: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/13.jpg)
This error is caused to the improper
immersion or insulation of head of bulb .
![Page 14: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/14.jpg)
This error occurs due to temperature difference between the bulb and solid bodies around it .
Dip Effect : In case of a metallic bulb of mercury filled system, the metallic bulb expands before expansion of mercury , hence volume of bulb is increased and pressure reduces . So in short respose of thermometer is slowed down .
![Page 15: Sorces of errors in a filled system thermometer](https://reader033.vdocument.in/reader033/viewer/2022061313/5594255b1a28ab2b768b467f/html5/thumbnails/15.jpg)