Need Help!- Electronic pressure regulator 4-20mA?

[DennisCNC]

I have one of these regulators:
http://www.ronan.com/products/product.cfm?ProductID=82

It has three connections on top ( -, +, G) the G is ground to case. How it this thing connected to the world? I'm assuming it needs a 24 to 36V supply and then 4-20mA control signal, but what goes were?

Or does this thing use the actual 4-20mA signal to power it self and control the pressure?

Didn't find any info in the PDF's on the site, I think they assume every one should know!?

Thanks

[epineh]

I couldn't get the IO manual from the site as you need to register and I am lazy but usually this type of thing accepts the industry standard 4-20mA input, the polarity is important which is why it is marked, and regulates the pressure.

I assume it has an air in (supply)connection and an output line that has the regulated pressure, from the link the different models have Standard 3-15, 3-27 or 6-30 psi Ranges that relate to the 4-20mA range, for example with a 4-20 mA input signal you can have a 3-15 psi output pressure, or any of the other ranges if you specify.

There are also lots of variations on this, you can get pressure to current transducers which are basically the opposite of this one, for a certain pressure range it will output a 4-20mA signal.

Hope this helps.

What were you trying to do with this ?

Russell.

[Geof]

Originally Posted by DennisCNC I have one of these regulators: http://www.ronan.com/products/product.cfm?ProductID=82.....

You call it a "regulator" but it is a transducer.

I could be interpreting things wrong but to me a regulator is something that takes an incoming supply at a high pressure and gives an output flow at a lower pressure while a transducer gives a more or less static pressure reference. My understanding of the use of these current to pressure transducers is that the variable pressure they output is used to subsequently control something like a regulator further along in the assembly.

[irving2008]

Need to be clear which model you have...
the X55-600 is a current to pressure... i.e input current regulates output pressure

the X55-300 is the opposite... input pressure gives a current signal...

see here

both require a 36v supply. for the X55-600 the case ground is just a safety measure. the current flow is isolated.

Assuming you have a X55-600 then in use you would put +36v on the + connection and connect the - connection to a current regulator and then back to the -ve power supply conection.

For testing or static pressure this could simply be a resistor...

r (in Kohms) = 36/i so for the 3-15psi model a resistor of 36/4 = 9k will give 3psi and 36/20 = 1.8k will give 15psi

A 1.8k resistor in series with a 10k variable resistor will give a variable pressure set up.

depending on your application and for more complex set-up you'll probably need a voltage to current converter. let me know if you need more info.

If you have a X55-300 then let me know and I'll describe how to use it..

[epineh]

The ones we used at work were generally connected to positioning type valves used in process control, controlled by PLC, the 4-20mA signal from the PLC set the position of a valve (that was pressure regulated) then monitored the resultant flow, water, juice whatever. Some of the better setup's had PID calculations included.

Russell.

[Al_The_Man]

Originally Posted by DennisCNC Didn't find any info in the PDF's on the site, I think they assume every one should know!? Thanks

They have the PDF on the site under manuals.
It is actually a Controller.
Transducer is a bit mis-leading as it can actually mean either a sensor or controller, as it is a conversion from one energy to another.
The PDF was too large to upload here.
Al.

[DennisCNC]

Thank you all the for the help, looks like irving2008 told me what I need!

The things that was unclear to me was that didn't know that it uses the actual 4-20mA supply to power it self and regulate the pressure. I'm used to devices having a input voltage terminal and another input for the control signal. But this is all in one. Pretty cool.

Thanks

[DennisCNC]

Connected it to a 4-20mA supply works nice!

Thank you all!