DIY KH station, automatic precsision KH-titrator

[igorlab]

Hi to all,

All of us know the importance of maintaining the stability of water parameters for the SPS reef tank. Mankind is lazy, it is also known :). So, to break the vicious circle I decided to make a poor man titrator and peristaltic dispenser to regulate the solution B added volume and keep the desired level of KH without including me in this process. The first variant was made on the peristaltic pumps - in spite of using the stepper motor for the peristaltic pump - results weren't satisfying - the device was needed to be very often calibrated, results reproducibility were low. Once, I visit the lab and inspired by high precision Tecan syringe pump decides to reproduce it in my device. I'm really encouraged by the results and decide to make a post about that. I'm planing this device as open-source, but for sharing, I have to finetune some moments in software (if someone would like to join me in this process you are welcome) and make a normal device case.

The device is running on ESP32.

Add some photos:

 

[gregor]

Hi to all,

All of us know the importance of maintaining the stability of water parameters for the SPS reef tank. Mankind is lazy, it is also known :). So, to break the vicious circle I decided to make a poor man titrator and peristaltic dispenser to regulate the solution B added volume and keep the desired level of KH without including me in this process. The first variant was made on the peristaltic pumps - in spite of using the stepper motor for the peristaltic pump - results weren't satisfying - the device was needed to be very often calibrated, results reproducibility were low. Once, I visit the lab and inspired by high precision Tecan syringe pump decides to reproduce it in my device. I'm really encouraged by the results and decide to make a post about that. I'm planing this device as open-source, but for sharing, I have to finetune some moments in software (if someone would like to join me in this process you are welcome) and make a normal device case.

The device is running on ESP32.

Add some photos:

Good evening, Igor.
An interesting design, can you tell us more about it?
With pleasure, would you try to make a similar apparatus?

 

[igorlab]

Hi, gregor,

You are welcome to ask about all details you are interested in :)

 

[Domi]

Awesome project!
Would be cool if you make it open source, I would definitely build such a device!

 

[catweazle0172]

Very nice build! Definitely following it!
Any idea what what the expected price will be?
And how often do you need to calibrate the PH probe?

 

[gregor]

Good evening Igor.
I wrote to you in private messages.

 

[igorlab]

Hi all,

Thanks for the interest in my device, I'm working under BOM, not fast, unfortunately))
pH is enough stable - it needs to be calibrated not more than once per month or two.
Concerning price - I don't know - it was assembled from parts I already have.

 

[catweazle0172]

So far as I saw the BOM, this build not become above 250Euro. :D
Iam thinking to combine it with my Autmatic Water Tester.
Automatic Water Tester

 

[gregor]

Good afternoon, Igor.
How is the progress in your project?
Can I view your project files to make your controller?

 

[gregor]

Good afternoon, Igor.
Any news on your project? How is it going?

 

[catweazle0172]

Yea here also the same question! Would love to make my own one!

 

[igorlab]

Hi to all,

Now, due to the circumstances, I have a lot of time and want to share my project of Titrator. The repository of the project is available on GitHub https://github.com/igorlab/KH_station There are all you need: 3D parts, PCB, short BOM, minimalistic descriptions, and step-by-step instructions for printing parts and assembling.

Since the last publications in this topic, the project has a lot of improvements and changes and now I believe it is in the state ready for hobbyist reproduction.