Zeus.
Fertz Meister
Hi all
Achieving a steady [CO2]/pH from lights on till lights off or 4-5hours into the photoperiod is tricky, but its a goal we all try to aim for OFC. I wont go into why we need this steady [CO2]/pH as Clive has covered the reasons for it it his excellent posts.
Recently upgraded my pH pen to a Hanna HI-98129 and have been doing pH profiles on both my tanks for couple of weekends and had an epiphany of how to get the steady [CO2]/pH whilst doing the pH profiles.
We play around with the BPS to get the target [CO2]/pH for lights on then the [CO2] creeps up slowly. We decrease the BPS then it takes longer to get the target [CO2]/pH
So what I I have done is similar to what a pH controller does without measuring the the pH. When lights go on, the CO2 goes off for 2.5mintes then back on again for 12.5 minutes, then rinse repeat for the rest of the CO2 period. the end result is a steady [CO2]/pH for the CO2 period to within 0.03/4pH via the Hanna pH pen.
Still playing with it ATM and might also need to keep the CO2 on constant when the lights are on the higher intensity as I do have them increasing during the photoperiod which will increase the CO2 demand of the plants. But I don't have them that high ATM so not an issue.
Obviously its all dependant on the number of time slots you can have on your timer OFC. Not an issue here as using a PLC there is no limit in real terms. (Infact didnt use a timer as such, used latching relays and on delays in the PLC software which are activated when lights and CO2 are on)
Just thought I would share
Zeus
Edit - one tank has CO2 reactors and the other has an in tank atomiser.
Achieving a steady [CO2]/pH from lights on till lights off or 4-5hours into the photoperiod is tricky, but its a goal we all try to aim for OFC. I wont go into why we need this steady [CO2]/pH as Clive has covered the reasons for it it his excellent posts.
Recently upgraded my pH pen to a Hanna HI-98129 and have been doing pH profiles on both my tanks for couple of weekends and had an epiphany of how to get the steady [CO2]/pH whilst doing the pH profiles.
We play around with the BPS to get the target [CO2]/pH for lights on then the [CO2] creeps up slowly. We decrease the BPS then it takes longer to get the target [CO2]/pH
So what I I have done is similar to what a pH controller does without measuring the the pH. When lights go on, the CO2 goes off for 2.5mintes then back on again for 12.5 minutes, then rinse repeat for the rest of the CO2 period. the end result is a steady [CO2]/pH for the CO2 period to within 0.03/4pH via the Hanna pH pen.
Still playing with it ATM and might also need to keep the CO2 on constant when the lights are on the higher intensity as I do have them increasing during the photoperiod which will increase the CO2 demand of the plants. But I don't have them that high ATM so not an issue.
Obviously its all dependant on the number of time slots you can have on your timer OFC. Not an issue here as using a PLC there is no limit in real terms. (Infact didnt use a timer as such, used latching relays and on delays in the PLC software which are activated when lights and CO2 are on)
Just thought I would share
Zeus
Edit - one tank has CO2 reactors and the other has an in tank atomiser.
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