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Diz

Member Since 26 Aug 2012
Offline Last Active Yesterday, 11:23 AM
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Posts I've Made

In Topic: Oxymeter Reading During Reduction

12 September 2014 - 07:40 PM

Thanks for posting the article, Pattip.  It is nice when we can use our various contacts and talents to help each other.


In Topic: Oxymeter Reading During Reduction

11 September 2014 - 07:59 PM

Sorry - can't find the article but I remembered the name is not 'McCall' but 'Roger Graham'.  I did an online search for 'Roger Graham and ego sensor' and came up with some leads.  There are some clayart links on which Roger answers  questions and mention is also made of his article in Ceramics Monthly.  If anyone has a library of old CMs, the article was published in the March 2003 issue and begins on page 84.  Anyone with access to a large library with old magazine issues, another site lists the accession number to access the article as # 9349916.  A bit more info always helps....


In Topic: Oxymeter Reading During Reduction

11 September 2014 - 07:16 PM

I have used the auto oxygen sensor (Bosch) for several years and have had good luck with it. I also cannot justify the cost of an oxygen sensor.  Forgive me but I don't know all the terms on the multimeter - I use the readings that I get from reading the numbers that I get when the unit is set to the upper left and the dial on '2'  (I believe this is the mvolt area.  (The symbol is a V with 3 dashes above it and a solid line above the dashes.)  The numbers I try to achieve are between negative 500 to 600.  I agree that the numbers can bounce all over the place but that is the range I shoot for.  My setup is not as slick as yours.  I have a Torchbearer updraft kiln with the hole in the lid so my readings are made on the exhaust exiting the kiln using a ceramic bracket that I made to hold the sensor in the flames.  I originally got the info from Roger (McCall?) in Australia. He had an article in Ceramics Monthly magazine - I'll search for the article and will scan it and post if I can find my copy.  He had graphs etc in the article.  I do keep a log showing my numbers but they don't always tell the info.  Smell and smoke still direct me and I gain confidence if the numbers correspond.  Last 2 firings the numbers were off and 1 firing had little reduction and the 2nd was my best reduction yet.  Go figure! - there are kiln gods.

 

Good luck to you - the auto sensor does work!


In Topic: Kaolin Substitutions

21 August 2014 - 06:38 PM

Thanks so much for the info!!  Today I was mixing some glaze tests and there was mention of both grolleg and EPK within some of my test recipes.  EPK I have so that went into the glazes.  Then I came in to 'do my research' via a question placed on this forum!  I'm glad others have the same questions I do and it makes me feel good to know that I have a forum to get answers to my questions.


In Topic: How To Soften (Liquify) Sodium Silicate

07 May 2014 - 12:28 PM

I thought I had it in a tight lidded jar - obviously not.  Glad it is cheap!  Here I was hoping there was an easy way to rehab it.  Gosh now I have another reason to head to Continental Clay!  What a hardship that will be  :>)  . Thanks for the quick responses.