"Then I tried 20ma and opened some links and got the one you needed. "

So not bad at all. I had earlier posted,

"Why not do a search for "20mA". It brings up many interesting links. Then you can look for what you want in that ? "

Looks like it has worked ! But full credit to Ijaz for going one step further and seraching further.

While on this, I wanted to post a good idea from Texas Instruments for feeding multiple instruments from a sinle 4-20mA loop.

Raghu