Arduino and analog output

I would like use arduino to control dosing pumps, but these are controlled by a 4-20 mA analog signal. Does anybody know some suitable DAC that may be used? I do not care about price, but, as a field instrumentation, I prefer simply wiring. Thanks in advance, Jan.

Need more specification on pump input signal.

Need more specification on pump input signal.

4-20 mA

Standard current-loop spec.

Hello!

You could use this http://www.nano-reef.com/forums/index.php?showtopic=230743 and with the same LM324 ('cause it has 4 OA) you could do this http://www.allaboutcircuits.com/vol_3/chpt_8/7.html .

Good luck!

Regards, Marius