4-20ma wireless system

[kiwisoundguy]

Hi There,

I am looking for a small DC (1.5-12v)powered 4-20ma wireless system. I need to transmit the current signal from about 30m away from my DC powered display. It only needs to be a one way transmit. There is no computer involved in any way. It is a simple loop circuit that I would like to have the cables removed.

Any ideas chaps? I noticed another topic that mention soemthing aout the Phoenix wireless stuff, but it looks quite big and the ability to supply that power / current is a worry.

Thanks in advance.

Ben

 

[benta]

Do you have line-of-sight? An IR system might be easier and cheaper.

Benta.

 

[kiwisoundguy]

Hi, LOS is possible but not always possible. What would you suggest in the infra red range? Would you also have some RF solutions?

Cheers, ben

 

[danw2]

1) Phoenix Contact has wired-in/wired-out for 4-20mA, they call it "one way". No software needed, just wire it and turn it on.

http://www.phoenixcontact.com/signal-level-matching/31240_15482.htm

2) Banner Engineering does analog in/analog out, with some mapping function in software.

http://www.bannerengineering.com/en-US/wireless/surecross_web_home

 

[kiwisoundguy]

Hi,

Thanks for that. I have seen the Phoenix before, but it is too large and the power demands are too high. I loke the look of the Banner stuff, but I fear it may be the same.

Do you think I could converter 4-20ma to 0-1v or 0-5v and use a simple AM/FM TX/RX?

 

[danw2]

I suppose you can breadboard anything.

Banner's stuff runs on 10-30V dc, so 12Vdc is doable. They've also got battery packs that will run the transmit side. The receiver/gateway side should be line powered through a power supply.

Link to 10-30Vdc stuff:

http://www.bannerengineering.com/en-US/wireless/surecross_web_nodeline