Search found 595 matches
- March 19th, 2024, 12:22 pm
- Forum: Knockbox
- Replies: 41
- Views: 891
Equations and boiler pressure
It's been a while since I've tuned any PID systems, but maybe this is helpful. As I recall, P is somewhat arbitrary. Pick a P that is conveniently fast to do what you want. Integral value depends on the behavior of the device. Insufficient I will have oscillation about the setpoint. This is called u...
- March 14th, 2024, 8:55 am
- Forum: Lever Espresso Machines
- Replies: 3
- Views: 226
Nuova Simonelli single lever espresso machine
Pretty interesting shop you have there. Did you shoot those photos? Does that plane fly? Anyway, I can't answer your question, although I'm surprised that your machine worked perfectly after 30 years of storage. The North American distributor for Nuova Simonelli is Nuova Distribution, in Ferndale Wa...
- March 2nd, 2024, 7:51 pm
- Forum: Repairs, Restorations & Mods
- Replies: 3
- Views: 226
Unknown espresso machine
Plenty of parts missing on the outside. Is there no manufacturer's plate with information on it? I would not bother with it. -Greg
- March 2nd, 2024, 12:37 pm
- Forum: Knockbox
- Replies: 13
- Views: 549
Argon for Coffee Storage
Well air is 78% nitrogen. Argon is pretty pricey. Nitrogen is less so. I sorta don't like putting CO2 into the atmosphere. All schemes require infrastructure (regulator, sealing scheme etc.). I've always just frozen my coffee. -Greg
- February 29th, 2024, 10:05 am
- Forum: Knockbox
- Replies: 41
- Views: 891
Equations and boiler pressure
In theory it's instantaneous, but there is probably some mixing in the boiler that adds time but I think any added time is negligible and certainly no reason to discard temperature as a means of controlling pressure in this application. -Greg
- February 26th, 2024, 1:14 pm
- Forum: Knockbox
- Replies: 41
- Views: 891
Equations and boiler pressure
It's very fast. Can't tell you in seconds but it ain't many if any. -Greg
- February 24th, 2024, 11:05 am
- Forum: Knockbox
- Replies: 41
- Views: 891
Equations and boiler pressure
Hey there: I should mention that you won't know temperature until you are above atmospheric pressure boiling point AND all vapor in the steam boiler is water. You'll have to be above atmospheric pressure boiling point because otherwise you won't have a mechanism to drive out the non-water gasses. Th...
- February 22nd, 2024, 5:20 pm
- Forum: Knockbox
- Replies: 41
- Views: 891
Equations and boiler pressure
Can you mention what kind of machine, and show us a picture of the current pressurestat location on the boiler? Since liquid in the steam boiler is where you want the probe, I'm wondering if there isn't a fitting on top of the steam boiler than can accommodate, and if not, can something be moved to ...
- February 19th, 2024, 5:06 pm
- Forum: Knockbox
- Replies: 41
- Views: 891
Equations and boiler pressure
Hi there: It's a whole lot cheaper and easier to use a thermocouple probe to measure the temperature inside your steam boiler than to use a pressure gauge. You were on the right track that you're looking for temperature corresponding to the steam pressure that you want. Most commercial espresso mach...
- January 16th, 2024, 5:36 pm
- Forum: Water
- Replies: 12
- Views: 558
Undersink RO water with remineralization
About 60 ppm. I'm running a La Marzocco Leva X. -Greg