for a bit of fun and because i scored a suitable pressure gauge for free , i have made up my own scace.
The scace is built onto a backflush disk which fits into a blind portafilter: it can be removed from the portafilter when done and easily re fitted.
The hardest part was making a bleed system; in the end i have a 1/4" bolt drilled and tapped with a 3mm bolt which can be loosened or tightened to allow the required flow.
I adjusted it to give 30ml in 20 seconds ( flow rate 1/2 way between a single and double shot)
I also have access to calibration so calibrated the gauge to 135psi (9 bar) so i know its accurate to about 1%.
I've used it to calibrate my Izzo Alex and the good news is the gauge on the Izzo is exactly on 9 bar after calibration. I needed to do this becuase Chris calibrates them using tank water feed and in the plumbed in setup you have additional pressure.
Interested in any feedback- have i missed anything?
The scace is built onto a backflush disk which fits into a blind portafilter: it can be removed from the portafilter when done and easily re fitted.
The hardest part was making a bleed system; in the end i have a 1/4" bolt drilled and tapped with a 3mm bolt which can be loosened or tightened to allow the required flow.
I adjusted it to give 30ml in 20 seconds ( flow rate 1/2 way between a single and double shot)
I also have access to calibration so calibrated the gauge to 135psi (9 bar) so i know its accurate to about 1%.
I've used it to calibrate my Izzo Alex and the good news is the gauge on the Izzo is exactly on 9 bar after calibration. I needed to do this becuase Chris calibrates them using tank water feed and in the plumbed in setup you have additional pressure.
Interested in any feedback- have i missed anything?

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