Join Date: Mar 2014
Location: Las Cruces, New Mexico
Low pressure test question
I just purchased from Aquariumplants.com the 2-stage regulator, with a mouse solenoid and Ideal needle valve, shown in the two attached photos. The high-pressure test conducted over 16 hours performed as described in the original post of this thread; in other words after closing the CO2 bottle valve, the HP gauge continued to show the starting pressure over a period of 16 hours.
However, the low-pressure test does NOT result in the pressure remaining in the LP gauge. Instead, when I turn the regulator control anticlockwise the LP pressure gauge returns to zero. Soap water on the various connections showed no visible leaks, so I concluded either the LP side of the regulator has an internal leak, or the solenoid...
Since this is a new unit I called Aquariumplants.com rather than attempting to removing the solenoid as suggested in the guide. The person I spoke to said the unit in the shop behaved in the same way. He said the way to perform the "bleed" test on this regulator, with the CO2 bottle valve closed, was to leave pressure in the HP regulator and leave the regulator valve open to maintain pressure in the LP regulator. In other words, it is not possible to isolate CO2 in the LP regulator.
I'm NEW to CO2, so I would appreciate an experienced member's thoughts on whether the information being provided by the person I spoke to at Aquarium plants could be correct for THIS regulator? Or could this be a misunderstanding on the part of the Aquariumplants employee and I need to ask to talk to someone more experienced?