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Strange problem with weighing water for V60
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Discussions > Coffee > Machines > Strange problem...  
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DoctorBeans
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Joined: 29 Jan 2013
Posts: 5
Location: UK
Expertise: I love coffee

Posted Tue Jan 29, 2013, 9:32am
Subject: Strange problem with weighing water for V60
 

I am having problems with measuring the amount of water that goes through my V60.

I have a Jennings CJ-4000, on top of which I put a warm carafe, the V60, a washed filter, and 24 g of ground coffee. My goal is to get 390 g (or mL) of water going through in about 2.5 min. I then zero the scales and start pouring, slowly and in stages. The problem is that, after a couple of minutes, the readout on the scales actually starts decreasing quite significantly, even though I am still pouring water into the grounds. This makes it impossible to know how much water I am actually pouring over, and by the end I feel like I could be out by as much as 50-100 mL.

Has anybody seen this before? Does anybody know what's going on? Thanks.
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Sam21
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Joined: 20 Sep 2011
Posts: 409
Location: Northwest, CT
Expertise: I love coffee

Grinder: Baratza Virtuoso, LIDO,...
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Posted Tue Jan 29, 2013, 11:38am
Subject: Re: Strange problem with weighing water for V60
 

DoctorBeans Said:

I am having problems with measuring the amount of water that goes through my V60.

I have a Jennings CJ-4000, on top of which I put a warm carafe, the V60, a washed filter, and 24 g of ground coffee. My goal is to get 390 g (or mL) of water going through in about 2.5 min. I then zero the scales and start pouring, slowly and in stages. The problem is that, after a couple of minutes, the readout on the scales actually starts decreasing quite significantly, even though I am still pouring water into the grounds. This makes it impossible to know how much water I am actually pouring over, and by the end I feel like I could be out by as much as 50-100 mL.

Has anybody seen this before? Does anybody know what's going on? Thanks.

Posted January 29, 2013 link

Are you timing your pour with your cell phone nearby? Put it onto airplane mode and be sure to move other wireless devices away from it! See if that helps.
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DoctorBeans
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Joined: 29 Jan 2013
Posts: 5
Location: UK
Expertise: I love coffee

Posted Tue Jan 29, 2013, 11:50am
Subject: Re: Strange problem with weighing water for V60
 

Are you timing your pour with your cell phone nearby? Put it onto airplane mode and be sure to move other wireless devices away from it! See if that helps.

You know, I was indeed timing it with my cell phone. Tomorrow, when I try again, I'll take this into account and let you know how it goes. (It's too late in the day for another coffee now.)

Thanks for the suggestion!
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yakster
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yakster
Joined: 25 Feb 2009
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Location: San Jose, CA
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Espresso: Gaggia Factory / La Peppina...
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Roaster: Behmor
Posted Tue Jan 29, 2013, 2:53pm
Subject: Re: Strange problem with weighing water for V60
 

I would also suggest testing your scale for heat sensitivity.  Place your carafe full of hot water on the scale with something between the scale and the carafe to insulate the scale from the heat and make a measurement.  Remove the heat insulator and place the carafe back on the scale with the insulator on top of the carafe this time and watch the scale to see if it weighs the same and if the weight changes as the scale heats up.

I picked up some cork coasters to see if this was happening with my American Weigh scales, but it did not appear to be an issue in my case.

 
-Chris

LMWDP # 272
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jpender
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jpender
Joined: 11 Jul 2011
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Posted Tue Jan 29, 2013, 4:08pm
Subject: Re: Strange problem with weighing water for V60
 

Don't forget to check to see if new batteries do the trick.
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dana_leighton
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dana_leighton
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Posted Tue Jan 29, 2013, 6:08pm
Subject: Re: Strange problem with weighing water for V60
 

yakster Said:

I would also suggest testing your scale for heat sensitivity.

Posted January 29, 2013 link

I second this suggestion. I have a scale that is sensitive to heat. When I was weighing my espresso shot I was watching the weight change. Weird. Putting an insulator inbetween solved the problem.

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
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DoctorBeans
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Joined: 29 Jan 2013
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Location: UK
Expertise: I love coffee

Posted Wed Jan 30, 2013, 9:45am
Subject: Re: Strange problem with weighing water for V60
 

Hi all, thanks for the suggestions.

I tried timing it with my cell phone in airplane mode, but that didn't help.

Tomorrow I'll test for heat sensitivity, and also to see if new batteries might help.
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Netphilosopher
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Joined: 14 Jan 2011
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Location: USA
Expertise: Just starting

Posted Wed Jan 30, 2013, 11:50am
Subject: .
 

.
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jpender
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jpender
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Location: California
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Grinder: OE LIDO
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Posted Wed Jan 30, 2013, 5:54pm
Subject: Re: Strange problem with weighing water for V60
 

A drift of 50 to 100g seems like an awful lot, even with a big pot of hot water sitting on the scale. It does fit the symptoms though.
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DoctorBeans
Senior Member


Joined: 29 Jan 2013
Posts: 5
Location: UK
Expertise: I love coffee

Posted Thu Jan 31, 2013, 8:39am
Subject: Re: Strange problem with weighing water for V60
 

I tried it today with a book underneath the carafe and I saw no drift in the weight measurement. I'll need to start looking for a more convenient way to insulate the carafe from the plate on the scales, however.

I'm a little surprised that I never saw any mention of this before (I did a lot of reading around before I decided on a set of scales). Is there a better sort of carafe to use to collect the coffee, i.e., one that's more insulated on its bottom? At the moment I'm using a stainless steel milk pitcher.
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