Kai-Wei,
I will be around tomorrow afternoon if you need a hand. I will send you my number.
In the picture you can see the regulator in the middle (black with red writing and two white bars) That adjusts pressure coming out of the tank. I have mine set around 15 I believe. The gold thin piece directly in the middle bottom part of the picture is the needle valve. You adjust that to obtain your actual co2 rate into the reactor. My guess is that the regulator is all the way open.
Scott
[ 10 December 2001: Message edited by: Shadetree ]