I have a hx machine and it has a mater pressurestat.
The deadband on the pressurestat is 0.5 bar. So setting it to turn the element on at 1.0, has it turning off at 1.5 bar.
This seems like its too big a variance.
What are others variance or deadband like?
Anyway, pid unless linked to pressure is a overkill, so thinking i could digitise the pressurestat for less than the price of a siria. Gaining a ssr, and tunable deadband and adjustable top and bottom switching from a pressure sensor, not temperature.
So, this guy Julian Edgar is awesome, does electronics, car tuning and a amazing array of stuff and is cool enough to write it all down. Its a ezine called autospeed.
Anyway, he talks about a voltage switch in one article here:
AutoSpeed - Digital programmable voltage switch
The boards are now $5 on ebay...
The way i see it, if i add a power supply, and a 30psi sensor, and a ssd relay.
I will have digitised the pressurestat with no moving parts and easy adjustability.
Just quietly, duplicating the system but using a 150psi sensor in the brew curcuit, would eliminate the opv in vibe pump machines.
The deadband on the pressurestat is 0.5 bar. So setting it to turn the element on at 1.0, has it turning off at 1.5 bar.
This seems like its too big a variance.
What are others variance or deadband like?
Anyway, pid unless linked to pressure is a overkill, so thinking i could digitise the pressurestat for less than the price of a siria. Gaining a ssr, and tunable deadband and adjustable top and bottom switching from a pressure sensor, not temperature.
So, this guy Julian Edgar is awesome, does electronics, car tuning and a amazing array of stuff and is cool enough to write it all down. Its a ezine called autospeed.
Anyway, he talks about a voltage switch in one article here:
AutoSpeed - Digital programmable voltage switch
The boards are now $5 on ebay...
The way i see it, if i add a power supply, and a 30psi sensor, and a ssd relay.
I will have digitised the pressurestat with no moving parts and easy adjustability.
Just quietly, duplicating the system but using a 150psi sensor in the brew curcuit, would eliminate the opv in vibe pump machines.



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