Yeah, it happened, dosing pump kept running and running

[gbru316]

I think it can happen with all brands. The chip on the pcb that switches the pumps on/off isn't Jebao but from a generic chipmaker. Dosing pump manufacturers don't have a lot of options here i guess.

I'm 99.9% sure that there isn't a dedicated "chip" used for this. Likely, it's an output pin on a microcontroller switching a transistor. Or controlling a motor driver (or something similar). Neither of which is application specific to dosing pumps, and all of which have hundreds -- if not thousands -- of options on the market.

 

[ZombieEngineer]

Found an issue though with this method of pulling the dosing line up.
Looks like the fluid will drop back a little towards the dosing container during the day, so not the right amount will be dosed.

That means you have a small leak somewhere in the line. Look for air bubbles to see what part of the line it is. Could be a bad seat, wrong type of tubing used (some require 4/6mm soft, some okay with hard, etc), a crack in a tube, or a leak in the head itself.

 

[Harold999]

That means you have a small leak somewhere in the line. Look for air bubbles to see what part of the line it is. Could be a bad seat, wrong type of tubing used (some require 4/6mm soft, some okay with hard, etc), a crack in a tube, or a leak in the head itself.

Found the issue. There was not enough tube around the wheels in the dosing head, it's not getting squeezed well enough then.