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Isomac Venus extraction and manometer
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wizja
Senior Member


Joined: 14 Dec 2006
Posts: 3
Location: Poland
Expertise: I like coffee

Espresso: Isomac Venus
Grinder: Isomac Macinino Prof. Inox
Posted Wed Jan 10, 2007, 5:32am
Subject: Isomac Venus extraction and manometer
 

Hi mates,

I'm new owner of Venus and have some question concerning extraction and manometer readings. When I start the machine the manometer reads 0 bar. Then after few minutes when I just drop the heated water as a waste the manomenter goes up to ~12 bar. And now, when should I extract the coffee, when there is 0 or 12 bar? When there is 0 the pressure constntly goes up during the extraction, and when there is 12 bar I'm afraid that the pressure hits the coffee too strong. What is better?

Thanks!
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nobbi4711
Senior Member
nobbi4711
Joined: 20 Apr 2005
Posts: 338
Location: Germany
Expertise: Professional

Espresso: Dallacorte Mini EX4
Grinder: Casadio Instantaneous
Vac Pot: none
Drip: French Press
Roaster: Mini-500/800N drum roaster;...
Posted Wed Jan 10, 2007, 8:22am
Subject: Re: Isomac Venus extraction and manometer
 

The Venus manometer is a brew pressure manometer. So it's just fine showing 0bar when the pump doesn't work. It's also fine that when pulling a shot, the manometer goes up from 0 to 12bar. Pressure must be built against the coffee puck.

You can adjust the brew pressure over the expansion valve to 10bar, but you have to open the machine for doing that. But it's a little tricky:

http://espressoperfetto.de/pdf/venus.pdf

The silicone tube with the number 40 goes onto the exp-valve. That must be screwed out a little. I don't know if it can be adjusted easily or if you hav to put a washer between cap and valve body. Maybe someone here has already done it.

Greetings \\//

Marcus
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nmayweather
Senior Member


Joined: 25 Jun 2004
Posts: 994
Location: nyc
Expertise: I live coffee

Espresso: expobar office, isomac venus
Grinder: mini mazzer
Vac Pot: bodum santos
Drip: mr coffee sp3
Roaster: toastmaster popper
Posted Wed Jan 10, 2007, 10:17am
Subject: Re: Isomac Venus extraction and manometer
 

to adjust, see http://coffeegeek.com/forums/espresso/machines/29416

be wary,  the relief valve on the older models would fall out  around 10 bars.   you might need a new spring (or you can adjust the  current spring to be a bit shorter )

actually, the gauge reads both boiler AND pump pressure-- if you look on the schematics you'll see why . its also not a quality guage, which is  why it can look erratic.
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