coffee forum, ?????, ?????, fresh coffee beans and tea house

[jackhkau]

???????
?????pressurestat
??????

[bib]

wow high tech ar...
but sorry to ask there is a 0.05bar dead band pressurestat.
electronic one more durable and better ?
Thanks for teaching.
0.05 bar pressurestat data sheet:
http://www.barksdale.com/download/?dl=505
mine is 0.2-0.3bar , due to the durable issue, I have given up the upgrade.

[jackhkau]

????????????
??PID ??????????d
???PID?????delay

??????0.80bar,????0.88bar
??98~99
???setting

???????PStat????
if you own a dual boiler machine, dont waste money to do upgrade like this.
It wont give you too much different.

Someone come with a "home made" pressure profile upgrade, which is great.

Ps .?????????expo bar ,?????????

[alexfan]

Do you keep the original PSTAT (set to just higher than the PID pressure) in serial with the PID control (SSR) ? In case of the PID fail (always on), the PSTAT could be the final protection.

[jackhkau]

It has a safety valve @ 2 bar something
I tested, no problem.
I foundD out inside no space to keep the original pstat.
Also You have to refit the copper tube.

Alexfan I like you pressure profile upgrade. Is it good?

[alexfan]

[bib]

for durable and simple pressurestat replacement 100,000 tested :