I am doing a detail engineering and a newbie in this field..

I want to understand that how measuring principle of an instrument would be decided like that of bourdon type, bellows, diaphgram etc for pressure measurment and also for other parameter measurements

can someone show lights on this or tell what are the general criteria. any attachments, links would be helpful

thanks

 

Tony Kuphaldt's massive tome on instrumentation, "Lessons In Industrial Instrumentation, version 2.01" from
www.ibiblio.org/kuphaldt/socratic/sinst/book/liii.pdf

 

> I want to understand that how measuring principle of an instrument would be
> decided like that of bourdon type, bellows, diaphragm etc for pressure
> measurement and also for other parameter measurements

It's decided by Range and Cost.

Bourdon tubes start about 20 psi full scale and are relatively cheap.
Bellows will measure quite a bit lower but more expensive.
Diaphragms will measure down to really low pressures.

It's also about materials of construction.

 

Thanks for sharing that link.

And that is an extremely good and noble effort by Tony to make the principles accessible for those of us whose path did not include higher mathematics. It's something I can recommend where I know $90 for a book might as well be a million. Which covers a lot of us working automation folks. No offense to the authors in our midst.

Regards
cww