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Pressurestat adjustment screws
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Discussions > Espresso > Machines > Pressurestat...  
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Ian
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Ian
Joined: 21 Jan 2003
Posts: 1,465
Location: England

Espresso: Euro2000,Rancilio
Grinder: Mazzer,La Cimbali
Vac Pot: Cona-->CraigA
Drip: Belgique for emergencies
Roaster: Primas with variac
Posted Tue May 4, 2004, 2:20am
Subject: Pressurestat adjustment screws
 

On this pressurestat, the central screw adjusts switching pressure, what is the other one for?


Ian

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MOSFET
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MOSFET
Joined: 31 Dec 2003
Posts: 376
Location: Long Island, NY
Expertise: I like coffee

Espresso: Linea
Grinder: Mazzer Mini
Vac Pot: Hoover
Drip: Post-nasal
Roaster: Perdue Oven-Stuffer
Posted Tue May 4, 2004, 3:59am
Subject: Re: Pressurestat adjustment screws
 

Looks like mine. I'll bet the ranch it simply holds the plastic cover on. There's one way to find out!

Keith
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Ian
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Ian
Joined: 21 Jan 2003
Posts: 1,465
Location: England

Espresso: Euro2000,Rancilio
Grinder: Mazzer,La Cimbali
Vac Pot: Cona-->CraigA
Drip: Belgique for emergencies
Roaster: Primas with variac
Posted Tue May 4, 2004, 8:33am
Subject: Re: Pressurestat adjustment screws
 

That was one of my initial thoughts but it has +<--->- next to it which indicates some sort of possibility for adjustment. I did wonder if it had anything to do with deadband adjustment.



Ian

 
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Ian
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Ian
Joined: 21 Jan 2003
Posts: 1,465
Location: England

Espresso: Euro2000,Rancilio
Grinder: Mazzer,La Cimbali
Vac Pot: Cona-->CraigA
Drip: Belgique for emergencies
Roaster: Primas with variac
Posted Wed May 26, 2004, 1:12am
Subject: Re: Pressurestat adjustment screws
 

Yep, it is deadband adjustment. Moving towards the + widens it and - narrows it.

Can you let me know the location of the ranch I've just won? ;-)

 
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Bushnell_A
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Joined: 30 Mar 2004
Posts: 47
Location: San Diego
Expertise: I live coffee

Espresso: Rio Commercial
Grinder: Rossi
Drip: Presto Scandinavian
Roaster: Cafe Moto
Posted Wed May 26, 2004, 3:06am
Subject: Re: Pressurestat adjustment screws
 

As long as we're on the subject, is there a way to adjust the deadband on a Sirai pressurestat?  The only apparent adjustment screw (on top of it) sets the upper end.  I'd also like to set the lower end a little higher than it is.
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rocket15
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Joined: 8 Nov 2003
Posts: 87
Location: Waterford, MI
Expertise: I love coffee

Espresso: Bezzera BZ02S
Grinder: rocky
Vac Pot: Infuze/Cory/Silex/GE
Drip: chemex/melitta pourover
Roaster: stir crazy/convection oven
Posted Wed May 26, 2004, 6:46am
Subject: Re: Pressurestat adjustment screws
 

what is deadband?
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HB
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Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Wed May 26, 2004, 7:44am
Subject: Re: Pressurestat adjustment screws
 

rocket15 Said:

what is deadband?

Posted May 26, 2004 link

It's the interval between "on" and "off."  For example, if the pressurestat kicks on the heating element at 0.9 bar and cuts off at 1.1 bar, the deadband is 0.2 bar.  That represents a temperature variance of ~4F, IIRC.

-- Dan

 
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rocket15
Senior Member


Joined: 8 Nov 2003
Posts: 87
Location: Waterford, MI
Expertise: I love coffee

Espresso: Bezzera BZ02S
Grinder: rocky
Vac Pot: Infuze/Cory/Silex/GE
Drip: chemex/melitta pourover
Roaster: stir crazy/convection oven
Posted Thu May 27, 2004, 6:29am
Subject: Re: Pressurestat adjustment screws
 

thanks for the explanation.  You made it very clear
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mikeW
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mikeW
Joined: 5 Dec 2003
Posts: 186
Location: sydney
Expertise: Professional

Espresso: S20de2 / classic 1v / rex...
Grinder: rocky / RR45 / climax
Drip: bravilor nova
Roaster: sienna-r3
Posted Tue Jun 1, 2004, 6:34am
Subject: Re: Pressurestat adjustment screws
 

Sorry to say that most commercial mechanical contactors/mechanical pressure switches have no band adjustment.
Standard differential is 0.2

MikeW
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EricC
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EricC
Joined: 2 Feb 2004
Posts: 268
Location: Liverpool
Expertise: Just starting

Grinder: Versalab M3
Roaster: Quest M3
Posted Thu Jul 15, 2004, 2:58pm
Subject: Re: Pressurestat adjustment screws
 

Ian,

I think i have just over adjusted my deadband adjustment screw. :-(
Over zealous with the screwdriver, and it looks as though i have stripped the threads,
this what i get for using a Leatherman Wave instead of a suitable screwdriver for such an intricate adjustment.

Does anyone on the group have any idea where i can buy a new Pressurestat to fit my Euro2000 Junior ?

Preferably one identical to the original as in Ian's initial post above.

No panic as we are off on holiday this Saturday for 2 weeks. :-)


Eric.
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