John Weber on mon 30 sep 02
My wife just bought me a new toy, a new Axner Oxyprobe for our Cone 10
Reduction firings. I have a question for those who use these great
instruments. I will be firing along in medium reduction at 0.60 on the
Oxyprobe and for some reason it will start to bounce around (almost
flickering) at 0.01 to 0.02. It seems to do that for a while and then I tap
(lightly) the damper and bingo it goes back up to 0.60 to 0.61. Am I just
getting a draft or does this sound like a problem with the Oxyprobe? I
couldn't believe how much I have been over reducing with excess gas. At
least that's what I think, because I have yet to open the kiln of my first
Oxyprobe firing. Before using the Oxyprobe on the same gas setting, I would
get reduction with the damper closed about 80% and a flame rolling out of
the peep hole. With the Oxyprobe I get 0.60 to 0.80 with 20% of the damper
closed and no clue of a flame at the peep. I'll report later on the quality
of color. John Weber
JODO Pottery
In Horse country, just 5 miles west of Short Pump, VA, and 18 miles west of
Richmond, VA.
Manakin-Sabot, VA
E-Mail: jodopottery@attbi.com
WEB PAGE: http://jodo96.home.attbi.com
Hank Murrow on mon 30 sep 02
>My wife just bought me a new toy, a new Axner Oxyprobe for our Cone 10
>Reduction firings. I have a question for those who use these great
>instruments. I will be firing along in medium reduction at 0.60 on the
>Oxyprobe and for some reason it will start to bounce around (almost
>flickering) at 0.01 to 0.02. It seems to do that for a while and then I tap
>(lightly) the damper and bingo it goes back up to 0.60 to 0.61. Am I just
>getting a draft or does this sound like a problem with the Oxyprobe? I
>couldn't believe how much I have been over reducing with excess gas. At
>least that's what I think, because I have yet to open the kiln of my first
>Oxyprobe firing. Before using the Oxyprobe on the same gas setting, I would
>get reduction with the damper closed about 80% and a flame rolling out of
>the peep hole. With the Oxyprobe I get 0.60 to 0.80 with 20% of the damper
>closed and no clue of a flame at the peep. I'll report later on the quality
>of color. John Weber
>
>JODO Pottery
>In Horse country, just 5 miles west of Short Pump, VA, and 18 miles west of
>Richmond, VA.
>Manakin-Sabot, VA
>E-Mail: jodopottery@attbi.com
>WEB PAGE: http://jodo96.home.attbi.com
Dear John;
Having supplied the OxyProbe on my Doorless Fiber Kiln
(http://www.murrow.biz/hank/kiln-and-tools.htm) for years now, I have
a suggestion, Fire your kiln pretty much the way you get the best
results with it, taking readings with the OxyProbe throughout the
firing. THEN fire the kiln BY the Oxyprobe using the numbers from the
previous firing. Many folks have been disapointed by the results from
'following the manual'.
Hope your first firing was great, Hank in Eugene
Bruce Girrell on mon 30 sep 02
>I will be firing along in medium reduction at 0.60 on the
>Oxyprobe and for some reason it will start to bounce around (almost
>flickering) at 0.01 to 0.02. It seems to do that for a while and then I tap
>(lightly) the damper and bingo it goes back up to 0.60 to 0.61. Am I just
>getting a draft or does this sound like a problem with the Oxyprobe?
I experience the same behavior, though it is more of a jump from .2 (not
.02) to .6. I suspect that the region between no reduction and .6 reduction
is either very narrow or else the response curve of the instrument is very
sharp in that region.
Bruce Girrell
who sometimes acts as though his brain is oxygen deprived or in reduction
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