Have turned up the low side regulator to 20 psi. Thanks!
S. Hieber wrote:
If you low side pressure shown on the regulator gauge is zero when the solenoid is open, then you have virtually no resistance to gas flow. It's like the regulator is trying to maintain pressure in a balloon with a giant hole in it.
At 20 psi, I'd expect the metering valve to be restricting the gas flow enough so that the pressure doesn't drop a whole lot -- it will drop a little if the line is opened at all, even with resistance -- in the trade they call it "droop". But if it's going down to zero, then the metering valve is not actually metering. If your controller is set at, say, 6.8, then it will trip on at 6.9 and trip off at 6.7. You don't need the system to bounce back up to 6.9 rapidly -- if the solenoid runs open for half hour or more at a time, that's fine. Then, if your aquarium isn't shedding CO2 too quickly, it will probably take an hor or more to drop back down to 6.7.
Christel Kasselmann, author of the best current authoritative text on aquatic plants will be a featured speaker at The Northeast Council of Aquarium Societies 30th Annual Convention.
March 18-20, 2005 at the Marriott Hotel, Farmington, CT
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