Humidity and temperature control inside an oil chamber

What kind of oil chamber, size, for what purpose? Temperature and humidity ranges? Any other pertinent information will get some help.

Hi Daniel,

for me as an electronic developer the temperature and humidity ranges would be of secondary interest. The operating expense (and so the system cost) mainly depends on the accuracy and reliability you need. If, lets say, your needed accuracy is +-1°C you get a real lo-cost-solution; is it +-0.01°C then you have to investr a little more brain (and, of course, money). Another point is, how noisy is your surrounding ? Industrial environment has often large electro-magnetic disturbances which may corrupt your (sensible?) system and you have a lot to do with shielding, special cabling etc.

At first you should find out your requirements of accuracy. Adapting ranges is mostly a potmeter turn or a programming sequence done in seconds.

Hope that helps,
Regards Uwe

Hello Daniel,

Another important point would be to know if you have any restriction in the size and location of your sensors and actuators.

Good Hunting!

hai everyone.. Thanks for your reply.. I'm doing a 50 litre prototype of cylinder shape oil chamber for my final year project. The oils is a raw oil, which mean it came from the source at offshore such as petroleum.. I'm quite blurr and i dont know what range should the humidity and temperature be.. But i prefer the accuracy for the prototype should be +-1 C only because since it is low cost and the sorrounding is a normal sorrounding.. Where can i find more information on this? I've search in the iee but found none about oil chamber.. I'm looking for journals or international proseeding on this project..

Daniel,

have a look at the application notes at analog devices (analog.com) or linear technologies (linear.com). There you find a lot of simple and cheap proposals for your solution (temperature and humidity).

The AD590 or LM234 are temperature transducers with good accuracy for your requirements. They give a millivolt per degree or microamp per degree which I would prefer because of its safe transmission over meters.

Also humidity sensors are named in the applications. Those are mostly capacitive sensors with a capacity of about 100pF and a variation of some pF according to 0...10% humidity. They are used together with a monoflop where the pulse time
is measured and proportional to the humidity.

Regards Uwe

thanks mate.. I'm doing quite okay now.. I'll reply on this thread again when i'm done with the project..