radiofrequency poition sensor

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vamsee

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Hi!!

I am doing project in which i have to find the position sensor for the ball valve, the picture has been attached. Is it possible to use radio frequency to find the position? pls help me out.

thank you
 

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This company is manufacturing some rotary encoders,magnetic sensors.They may have some solutions about your application.
It should normally be possible...
 
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    vamsee

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To sense the position of any control element like the ball valve, you can use several sensor types. Depends upon what precision you need in finding the exact position.
A ball valve usually operates in two positions only - on and off. For this you need a pair of contacts located around the two end positions of the lever. You can use also optical switches, with a LED and a photodiode, for the same operation.
If you need a high-precision angular-position sensor, then find suitable rotary sensors offering up to >1000 output pulses for one revolution, ~250 pulses for one-quarter rotation.
You can also use various potentiometers to develop a voltage proportional to valve setting angle.

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And yes, you can connect any of the above sensors to a radio link for remote indication or control.
 
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    vamsee

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thank u very much for the reply.. the main problem is that, there should not be any contact to the ball valve and the shaft connecting the valve (above and below) should not be disturbed.
 

Can you glue a permanent magnet to to the shaft below? Also somehow the position encoder needs to be mounted.

Enjoy your design work!
 
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    vamsee

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HTA said:
Can you glue a permanent magnet to to the shaft below? Also somehow the position encoder needs to be mounted.

Enjoy your design work!
Click to expand...

thanx for the gr8 idea.. if i glue permanent magnet to the shaft below, is there any sensor which sense the angular magnetic field? i found there is technique called two axis integrated magnetic sensor -- **broken link removed** check pg. 10
will this be good approach?
 

There are single chip encoder which using a single N/S-pole magnet to output the angle position with different resolutions. The angle resolution at 12-bit would be 0.1 degree. With 8-bit it is about 3 degree. The electrical interface to the outside could be digital or analog. Applications you find here: **broken link removed** .

Enjoy your design work!
 
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    vamsee

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Yes, you can make your design very nice and complex! I would use a reed contact located in selected positions, controlled by that magnet.
If you want really to use a RF sensor, you can use another electrode against the control lever, as a variable capacitor, to tune a RF oscillator . You can calibrate oscillator frequency to correspond to lever position. You can glue a ferrite block to th lever, to tune an oscillator coil.
 

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