Any way to have a scale to measure my CO2 tank? Especially for us with calcium reactors? Worst case is run out of CO2 and crash tank for low ALK.

I know $$$ but could save $1000 in dead coral

How about pressure monitor? Could use to see when tank is near empty. Will start to see pressure drop on tank and give a few days warning when tank is almost empty

I can make you a custom water level expansion module that could measure the psi of your CO2 tank

How would that connect? You'd need a tee in the airline? That's an awesome idea. I don't run a reactor..but for those that do, this would be so good.

Yeah, use a T on the airline.

Just curious, what would you have to mod to do that? I figured you could change the gain in software like we've done for longer pipes.

What would be cool would be this, plus the ph expansion plus a co2 regulator and have an all in one carbon reactor kit. AlanM built a pwm solenoid I believe that could be used. Let me see if I could dig up the link.

Here, check this out.

http://wamas.org/forums/topic/65104-diy ... ntry579900

I do have a little Arduino-driven mouse solenoid device. It currently has 4 channels and can use a potentiometer or 0-10V input to pulse a little 10ms bubble out of the mouse solenoid, which is inline in the low-pressure side of the CO2 tubing. It can go from 2 minutes per bubble to 2 bubbles per second. I was basically trying to see if I could make a controllable version of one of those CarbonDoser things for a few dollars.

The goal is listening to a pH probe and dynamically adjusting the bubble rate. With the pressure sensor on the low pressure line it would close the loop with controlling the thing, I think.

Hey that would be awesome, my Aquarium Plants Bubble Controller was $299.00 If it comes near that price point I am in on one of those.

The first stage on the CO2 Regulator at max fill is 1000 psi. That would be the pressure I would want to measure. When this starts to go down then I know my CO2 is near empty. I do not need an absolute measure on the Pressure just an indication when there is a downward trend. Would a pressure transducer be a better fit? Could tee or replace the first stage gauge. I am not putting a 1/4" tube or any tubing on that side and hooking to the current water level sensor. Asking for some serious problems.

lnevo wrote:Just curious, what would you have to mod to do that? I figured you could change the gain in software like we've done for longer pipes.

What would be cool would be this, plus the ph expansion plus a co2 regulator and have an all in one carbon reactor kit. AlanM built a pwm solenoid I believe that could be used. Let me see if I could dig up the link.

I would buy this! This is a major failure point in my system that keeps me up at night. I lost my entire tank in an ALK spike, due to no CO2. Lost few $1000 in coral.

This is the regulator I am using:

http://www.aquariumplants.com/CarbonDos ... _p/co2.htm

Would it be possible to get a peristalic pump as well to feed the reactor? Would have to be continuous duty.

1000psi?
That seems a bit excessive.
Are you sure it is not 100psi?