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Technivorm Moccamaster CD question-- "Is it hot enough for ya?"
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CraigA
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CraigA
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Posted Fri Apr 13, 2007, 2:57pm
Subject: Re: Technivorm Moccamaster CD question-- "Is it hot enough for ya?"
 

Hmmm, yep., I've had more than a few thoughts too.., but I've held off till now just to read the responses. {;-D

 
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varuscelli_II
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varuscelli_II
Joined: 22 Feb 2007
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Location: League City, Texas
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Drip: Technivorm KBT-741
Posted Fri Apr 13, 2007, 5:55pm
Subject: Re: Technivorm Moccamaster -- "Is it hot enough for ya?" FINAL VERDICT: NO
 

jadventurous Said:

You know, I THOUGHT this issue would arise, given the high caliber of folks here. :)

So I took the liberty of creating a video that shows a pot of water, brought to boil, and the temperature readings of the device as and while water boils. Once water boiled, the temps were hovering between 210 and 214 or so, so that tells me that it's pretty accurate. I am situated only about 100 ft. above sea level.
JAD

Posted April 13, 2007 link

How about this hypothesis (coming from a non-physicist)...  ;-)

If you measure the surface of actively boiling water with the IR thermometer, the surface of that water will indeed be at the 212 deg. F mark because it is actively boiling.  

But...if you measure the surface temperature of water that has already passed through the coffeemaker (and is no longer actively boiling), and that surface temperature doesn't match the average temperature of the overall volume of water in the container (the filter holder or carafe), then you could have a mismatch.  That is, a mismatch between the surface temp and the temp below the surface.  (Remember, this is me just searching for an explanation in this particular case, since I know that the temperatures I am getting in my Technivorm are higher than in this example case.)  

I think (at least from my hypothetical standpoint) that the surface temperature of the water in that secondary container could perhaps be less (as measured by the IR device) than the temperature of the water beneath it because of the contact with the cooler air above.  

So, maybe it's possible that the surface temperature (which your Raytek is likely measuring accurately) is not the same as the temperature below the surface (or indeed the same as the average temperature in the body of water being measured).  

How's that for a guess at what might be going on?  ;-)

And I have to ask again...have you tried a different thermometer?  That is, one that you can actually place into the water to get something other than a surface temperature measurement?  Just in case there might be a difference?
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Mercury3
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Joined: 1 Jul 2006
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Location: Colorado
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Posted Wed Apr 25, 2007, 6:15am
Subject: Re: Technivorm Moccamaster -- "Is it hot enough for ya?" FINAL VERDICT: NO
 

Something has to be wrong somewhere.  This keeps coming up and this is what I got in the last thread where this was discused:

My house was 56 degrees when I got up this morning so the metal bar and rest of the pot was cold starting out.

I put the temp switch on the warming plate to high and started a pot.  

Half way through I removed the pot to allow the coffee chamber to fill up.  After filling it read about 195-196 degrees.  

Once the pot finished the coffee in the pot read just slightly under 170.  About 169 degrees.

I live in Colorado at a little over 5000 feet elv.


I warm my coffee cup up with hot water prior and even after putting in cold half/half my coffee is still very hot.
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CraigA
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CraigA
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Posted Wed Apr 25, 2007, 6:44am
Subject: Re: Technivorm Moccamaster -- "Is it hot enough for ya?" FINAL VERDICT: NO
 

Mercury3 Said:

I live in Colorado at a little over 5000 feet elv.

Posted April 25, 2007 link

That's the reason, your boiling point of water @ that elevation is only 203F! Sea Level 212F.
You do the calculation: http://www.biggreenegg.com/boilingPoint.htm

If you look at BUNN brewers they sell high altitude models..

 
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Mercury3
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Posted Wed Apr 25, 2007, 6:55am
Subject: Re: Technivorm Moccamaster -- "Is it hot enough for ya?" FINAL VERDICT: NO
 

CraigA Said:

That's the reason, your boiling point of water @ that elevation is only 203F! Sea Level 212F.
You do the calculation: http://www.biggreenegg.com/boilingPoint.htm

If you look at BUNN brewers they sell high altitude models..

Posted April 25, 2007 link

I think you missunderstood.  The readings in my Moccamaster CD are MUCH hotter than his readings.  Doesn't make any sense and I suspect his therm. has to be off as the water comes in just under boiling.
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CraigA
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CraigA
Joined: 19 Dec 2001
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Location: Rexdale, Toronto, Ontario, Canada.
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Roaster: Refurb Behmor 1600, BBQ...
Posted Wed Apr 25, 2007, 7:01am
Subject: Re: Technivorm Moccamaster -- "Is it hot enough for ya?" FINAL VERDICT: NO
 

Yeah, ok., & he's all over the place with the IR therm too. Try holding the dam thing steady for at least longer than 1 sec lol..

 
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varuscelli_II
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varuscelli_II
Joined: 22 Feb 2007
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Location: League City, Texas
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Drip: Technivorm KBT-741
Posted Wed Apr 25, 2007, 7:18am
Subject: Re: Technivorm Moccamaster -- "Is it hot enough for ya?" FINAL VERDICT: NO
 

CraigA Said:

Yeah, ok., & he's all over the place with the IR therm too. Try holding the dam thing steady for at least longer than 1 sec lol..

Posted April 25, 2007 link

Yeah, and I don't think the original poster on this thread ever responded to suggestions about double-checking his findings with a second thermometer.  I might have missed that, but he was asked more than once (if I recall correctly) and never responded, I don't think.  

Seems to me (and this is just my opinion) if someone is willing to take the trouble to make and post a video on the subject, he might also be willing to double-check is readings with another thermometer and post those results.  :-/

And seriously, what I do when taking a measurement with something like a meat thermometer is to hold it with a pair of needlenose pliers if I have to dip it down very far into the mouth of the thermal carafe (maybe a nonissue with glass carafe).  Otherwise, the heat rising out of the thermal carafe gets a bit intense.  ;-)
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CraigA
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CraigA
Joined: 19 Dec 2001
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Location: Rexdale, Toronto, Ontario, Canada.
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Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Wed Apr 25, 2007, 7:34am
Subject: Re: Technivorm Moccamaster CD question-- "Is it hot enough for ya?"
 

Well I know my readings are accurate as I have a laboratory grade murcury glass thermometer & have an accurate DMM that's been checked & calibrated to it & boiling water @ my elevation. {;-)

 
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varuscelli_II
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varuscelli_II
Joined: 22 Feb 2007
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Location: League City, Texas
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Drip: Technivorm KBT-741
Posted Wed Apr 25, 2007, 7:53am
Subject: Re: Technivorm Moccamaster CD question-- "Is it hot enough for ya?"
 

CraigA Said:

Well I know my readings are accurate as I have a laboratory grade murcury glass thermometer & have an accurate DMM that's been checked & calibrated to it & boiling water @ my elevation. {;-)

Posted April 25, 2007 link

Don't worry, Craig, I'm not questioning the accuracy of your readings.  I don't think you're the type of person to be sloppy in his approach to "things coffee"...  ;-)
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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,273
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Wed Apr 25, 2007, 7:59am
Subject: Re: Technivorm Moccamaster CD question-- "Is it hot enough for ya?"
 

varuscelli_II Said:

Don't worry, Craig, I'm not questioning the accuracy of your readings.

Posted April 25, 2007 link

I know Al, thanks., & I'm not questioning you either. {;-)

 
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