Hypothesis In line pH probe - genius or terrible idea?

[JacksonL]

As I rethink the plumbing in my tank, I am planning to remove as much equipment from the tank as possible.
Being a relatively smaller tank (130L, 80cm) there are less places to hide all the tech.
On other tanks, I have used cable glands, meant for electrical installs, to install standard in tank heaters in line. I have had these running for about 8 years and they have never leaked a drop. So I am comfortable that they are waterproof.
I am looking to use one to install my pH probe between the filter outlet and my CO2 reactor.
I have made a prototype setup which is pictured below. Before I go for it, I wanted to see if anyone had tried this before, or if anyone can foresee issues with the idea.
It is easy to remove the probe for calibration, with the filter off you just unscrew the gland back nut and pull it out, replacing it with a plug the same size as the probe.
To try and prevent faster probe wear from the turbulence of the filter line, I am hoping having it set back from the main flow, with the tee and couplings, will have it in a calmer pocket of water.




will it work?

 

[Naturescapes_Rocco]

I think it will work! Like all equipment it will need maintenance at some point.

GHL, the aquarium computer system I use, has an inline probe measurement cell that can hold up to 4 probes at once:

 

[JacksonL]

I do like that that one reduces turbulence with the cylinder! Might have to find a nano prefilter or similar to emulate it.

 

[JayP]

My question would be, assuming water passing back through the filter will be degassed to some degree, how will the ph reading between the filter and reactor correlate to the reading in the aquarium?

 

[JacksonL]

My question would be, assuming water passing back through the filter will be degassed to some degree, how will the ph reading between the filter and reactor correlate to the reading in the aquarium?

I wondered the same, it will definitely be degassed of CO2 to some degree. The other variable is that the biological filtration may lower the O2 in the water, which will have an effect too.
It may be better on the intake side of the filter, then it is getting water straight from the tank.

 

[JacksonL]

Quick prototype with spare parts.
Will add a temperature probe port and see how it goes. Would prefer a smaller filter housing, but this is what I had in the shed.