Finally got my CO2 setup finished! - The Planted Tank Forum
  • 2 Post By jondrums
  • 2 Post By jeffkrol
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post #1 of 4 (permalink) Old 04-22-2018, 06:43 AM Thread Starter
Algae Grower
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Finally got my CO2 setup finished!

A while back I made some posts on getting my TC420 to work with the Fluval 2.0 LED.

Well, I've finally got everything together to add a solenoid control for my CO2 system on the TC420. Get everything connected, debugged, and programed - working great now!

Here's how I connected the Solenoid valve to channel 3 of the TC420. I used a diode to ensure that when the solenoid is switched off, there is no voltage spike to the TC420.

Got ahold of a victor regulator, it is very nice. Probably will replace the metering valve - would love something with more adjustment range.

Oh, and here's the tank - Finally ready to add water! Everything up top is my wife's work, everything down below is mine...

Bump: And for those interested, here's a partial list of parts used in the CO2 system build:

Regulator: Victor SR253B sourced from EBay
Solenoid: 24VDC solenoid valve from Amazon
Wiring connector for the solenoid: 2pin waterproof connector from amazon
Diode: 1N4002 (amazon)
one-way valve: from greenleaf aquariums
bubble counter: Cal Aqua double counter
Diffuser: Cal Aqua inline diffuser
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Last edited by jondrums; 04-22-2018 at 06:58 AM. Reason: linking images
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post #2 of 4 (permalink) Old 04-22-2018, 03:49 PM
Planted Tank Guru
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Minor suggestion:
You have an atypical metring/needle valve and it may or may not be sufficient control.
One suggestion is an SMC-AS1000 or Camozzi equiv in-line (usually m5/hose barbs) for finer control..
Cheap add-on in the sub $20 range.

no need to change anything..

Next thing:
I assume you have the TC set NOT to ramp correct?
Not sure how the solenoid would handle PWM........
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"A man with a watch knows what time it is. A man with two watches is never sure"
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post #3 of 4 (permalink) Old 04-23-2018, 12:39 AM
Algae Grower
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Very nice clean setup!
when Co2 injector clogs, try replacing with something easy to clean (advice from experience!)
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post #4 of 4 (permalink) Old 04-23-2018, 07:17 AM Thread Starter
Algae Grower
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Oh man, so the fanciest part of my setup (the diffuser) will clog and be difficult to maintain? Bummer.

thanks for the referral on the metering valve - I'll try that one. And yes, I set the TC420 to NOT ramp. The solenoid would handle it just fine, it just wouldn't turn on until the PWM gets to about 50% or so.
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