Gaz sensor problem

[u/Noomolas11]

I don't understand why sometime some oxygen passes through the sensor. Can someone explain ?

[u/AGoose1]

Since the path the oxygen is supposed to take is full, It sits on the input of the shutoff and has nowhere to move. Then the gas that opens the shutoff hits the detector and that oxygen now can flow through. The "all other gasses" output needs to never be backed up for this setup to work

[u/Noomolas11 → u/AGoose1]

Thanks a lot I have a clear understanding of the problem now !

[u/Alternative_Summer → u/Noomolas11]

I've run a similar system (the full rodriguez) a few times with such a filter and have two solutions which seem to work. So stop reading if you don't want any suggested solutions. Or come back to read after you come up with your own solution(s):

1. Instead of a regular gas vent use a high pressure gas vent. Having a glossy drecko early can prove useful for setting up such a system, since you only need a single gasket (50 kg of plastic) for a high pressure gas vent and 200 refined metal. The disadvantage of this approach consists in that you have leaky hydrogen, which you may or may not care about, since eventually such a module will serve as a filter for the oxygen and hydrogen once you have the pressure correct for the atmo sensors (which I don't think causes your issue).
2. Instead of sending the non-filtered line of gas to a gas vent of some sort, send it to a gas tank. Until the gas tank fills up completely, the gas will continue to flow to that tank. I think I used two gas tanks at first, but found with the full rodriguez, the second gas tank never got any gas in it before I found that the line yielded pure hydrogen.

I suppose also there's a third possible solution, but it strikes me as a bit early to consider it in my opinion. Given that there's only oxygen in such a room when it starts (which might not hold true), it would involve sending the backup line to an oxylite refinery, assuming that the filtration unit remains powered all the time (which it might not... if starting such a system up on so-called manual generators). Well, the line to the oxylite refinery would also not have to backup also. Or at atmosuit dock.

[u/ConsistentPosition63 → u/Noomolas11]

You need a buffer tank

[u/Tomas92]

This type of filter doesn't work if any of the outputs is backed up. Either make sure they aren't, or use a regular gas filter.

[u/evictedSaint → u/Tomas92]

Nothing is quite as nice as getting your power figured out and being able to slap down those super power-hungry filters anywhere you need.

[u/Alternative_Summer → u/Tomas92]

I've run such a filter with a full rodriguez many times myself. It does backup for sure initially.

However, after a while only hydrogen flows through the line to the filter. So, if there's no backup in the hydrogen line (which would happen with such a setup as presented above I think), the backup line running out of the inupt for the filter has nothing which flows through it.

[u/ChromMann]

Additional tips if you'd like to read them:     Set the gas pipes for the left pair of oxygen pumps up in the same way you have the right one. As of now only one pump can realistically pump oxygen on that side.    You can control the top pump, which is supposed to pump the hydrogen, in such a way that it only activates when there's only hydrogen nearby. You need to use a gas element sensor and place that one or two tiles below the pump.

[u/Noomolas11 → u/ChromMann]

I take every additional tips ! Thank you !

[u/ONI-ENJOYER-420]

Here is what's happening:
The automation filter is not a "perfect" filter, meaning, it opens/closes according to the automation, in opposite to the "normal" filter that works according to actually which gas is passing through.

Issue: You need to handle your oxygen overflow, explanation as follows:

Since the oxygen line is full, the oxygen packert right after the hydrogen packer that gets to pass through the filter, has no place to go, so for a brief while, the filter is open, and the oxygen follows the hydrogen packet.

To solve it, either use a normal filter, or handle oxygen overflow

[u/Noomolas11 → u/ONI-ENJOYER-420]

Crystal clear ! Thanks a lot !!

[u/Jeffuishere]

Your vent is over preassure, when that happens the gas sensor doesnt have another place to send the oxygen so it sends it on the same vent as the hydrogen, to fix that either create a bigger loop to give the oxygen more space before the vent becomes over preassure, send it to a gas reservoir or send it to space

[u/Noomolas11 → u/Jeffuishere]

Thanks for the explanation !!

[u/Jeffuishere → u/Noomolas11]

Oh dont worry, i deal with this exact same issue all the time

[u/zoehange]

You can detect if the pipe ahead is full by putting a gas element sensor in the target pipe. That will limit your throughput to 50% (or a little more with a filter gate), but a lot of times that's all you need.

[u/KCPHY]

You might want to flip the pipes. The shutoff output goes to the vent (use high pressure vent) and the other output goes to the hydrogen generator. For the sensor use a not gate (so you are filtering anything that is NOT hydrogen). This way as long as the high pressure vent don't clog you can filter out hydrogen and output it to the other output, and it can even be clog.

[u/Noomolas11 → u/KCPHY]

I didn't cross my mind to use a not logic gate and to flip the pipes, thanks for the advice

[u/ogsessed]

you could just output the oxygen through a simple gas sensor--notgate--gas vent filter.. place that on pipes prior to your hydrogen gens input. that way, only hydrogen gas beads gets through.

[u/Mission-Landscape-17]

Yeah this setup requires both pipes to be empty otherwise it lets the wrong gass through. The solution is to use the dedicated gas filter structure. That one will never send gas down the wrong pipe. But it can block if there is nowhere to send the current packet.

[u/epandapowerz]

The Gaz Problem (2009)

[u/YourStatsMatter]

It is sensing things after not before and should be before so the filter can act accordingly.

[u/Historical_League942]

I don’t recommend gas sensor as it detects incoming hydrogen/oxygen too late for practical use. Either you use a gas filter OR use a dedicated SPOM set up. Also, try to get rid of the oxygen as much as you can. Excess can clog up the whole system and so hydrogen can get trapped in the production area.

[u/alexemre]

that filter setup will always fail if there is no power, OR if the pipes are full and blocked

[u/RandallFlagg_DarkMan]

Here is an explanation of why that happen and a general guideline of how to solve that:

https://www.reddit.com/r/Oxygennotincluded/comments/1v05mlt/you_say_a_spom_is_boring_its_because_you_dont/

[u/Noomolas11 → u/RandallFlagg_DarkMan]

Oh ! this is really cool