Electrical Engineering - concept of I/P converter & P/I converter

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concept of I/P converter & P/I converter

industech

2006-02-26, 7:21 am

Hi,

Thanks for guidence on PLC information.

I searched the web for I/P converter and P/I converter working concept.
all results came with product catalogues.

Can anybody help me out,

thanks and regards,

industech

daestrom

2006-02-26, 11:21 am

"industech" <ravisgk@gmail.com> wrote in message
news:1140950899.727877.70910@i39g2000cwa.googlegroups.com...
> Hi,
>
> Thanks for guidence on PLC information.
>
>
> I searched the web for I/P converter and P/I converter working concept.
> all results came with product catalogues.
>

What is it exactly, that you're looking for? P/I and I/P usually have
standardized ratings. As for the 'P', 3-15 psig is a very common control
range, and for the 'I' side, 4-20 ma, and 10-50 ma are two common ranges.
There are also voltage converters that will convert a pneumatic signal to
voltage, 0-10VDC and 1-5VDC are common there.

You want theory? features? build-your-own? P/I (or P/V) have at the heart
of them a pressure transducer. Could be Bourdon tube with differential
transformer, strain-gauge, variable-capacitance, all sorts of possibilities.
Once converted to electronic form, demodulate it if necessary, and 'massage'
it with any sort of signal conditioning circuitry.

For the reverse direction I/P or V/P, the central element is more limited.
Usually a force balance set up with a tiny 'flapper' bleed valve and then
variable back-pressure of the bleed valve is used to regulate the main air
supply through mechancial advantage of wide-area piston controlling a main
valve.

daestrom

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