[GreenKeys] Current loop converters.

[Jeffrey D Angus]

These are the "Black Box" loop converters that show up on eBay from
time to time.
<http://www.blackbox.com/Store/Detail.aspx/RS-232-to-Current-Loop-Interface-Bidirectional-Converter-232-CL-E-AC-Powered-Active-or-Passive-Standalone/CL050A-R3>
$270 each new from Black Box.
 From the data sheet:
<http://www.blackbox.com/resource/files/productdetails/17068.pdf>
> As active devices, these converters supply 20-, 30-, or 60-mA loop
> current at 18 VDC for operation. As passive devices, the converters
> will not supply loop current, but will operate with 20-, 30-, or 60-
> mA unipolar current at up to 30 VDC.
However, the model number to keep an eye out for is:  CL051A
They are rated at up to 130VDC loop supply voltages.


-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com