Originally Posted by FischAutoTechGarten
Are there any potential weaknesses of this CO2 Regulator/DualGuage/Solenoid/NeedleValve/BubbleCounter unit? Or should I anticipate a decent service life?
it works, and quality is OK, but it is a single stage and can not escape OUTPUT PRESSURE RISE which causes EOTD, and in extreme case, fish death.
The 10lb co2 tank you have, will still hold 1-1.5lb of co2 when all liquid co2 are gone and pressure start dropping. The pressure drops from 800-850 to near zero, the output pressure may rise by 10 psi(you can test this by turning off the co2 tank valve, and let the co2 run as usual, you will notice LP gauge needle goes up while the HP gauge needle goes down), sometimes this is a big increase of co2 injection and will cause trouble if you are not paying attention to the issue or to avoid it.
To avoid problem:
1. have it work with a Ph controller or do not run co2 near threshold
2. make sure you set the output pressure higher(45 psi+), because if you set the regulator output pressure higher, when the input pressure drops, the output "rise" only contribute to a fairly small percentage extra co2 outputs compare to when the pressure output at low setting.
But, when you set the output pressure high, you will see it is not easy to dial in or set constant the co2 flow rate with that needle valve, it is kind of delmma, need to settle for the balance(find the sweet spot).