options in porcelain on thu 7 sep 00
Does anyone have a recommendation for location of
oxyprobe in a Bailey 18/12 downdraft natural gas kiln?
Bailey recommended half way down, half way in on the
left side but I'd like to know if anyone has any
experience with this.
Thanks, Ronda in Virginia
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John Baymore on fri 8 sep 00
Does anyone have a recommendation for location of
oxyprobe in a Bailey 18/12 downdraft natural gas kiln?
Bailey recommended half way down, half way in on the
left side ..............
Ronda in Virginia,
Hi. Couple of thoughts on oxyprobes that might be useful.
Like any sensor unit....... the oxyprobe only gives you an indication of
the situation that is within the probes "field of view" (So to speak). =
Tells you nothing about what conditions are a distance away unless you kn=
ow
that the sample point is representative. So no matter where you locate i=
t,
unless the conditions in the rest of the chamber correspond to those at t=
he
probe site, you can get variations in results.
The evenness of the atmospheric distribution in a kiln chamber is primari=
ly
a function of the quality of the "mixing" (turbulence is a factor) that t=
he
combustion system (kiln, burners, vent system together) provides. The
better matched the various components, the better (more even) this
atmospheric distribution is. This makes the selection of a representativ=
e
sensor position far easier .
So..... I would posit that Bailey probably knows their kilns circulation
patterns pretty well. If they say a particular location is a good
"representative" sampling point for the average conditions in the
chamber..... I would tend to follow their recommendations. I would howev=
er
ask them if they have done experimentation and testing of this specific
type of unit to come up with that suggestion.... or if it was just a "goo=
d
guess" by one of the sales staff .
The good news is.......... if you are not used to using an oxyprobe to fi=
re
with.......... no matter where you tend to locate it, you will gain very
valuable information about your firings, and will improve fuel economy an=
d
the repeatability of effects. They are great tools for gaining
information. To use a variation of that computer marketing
cliche'............... timely, accurate information is power.
BEst,
......................john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
603-654-2752 (s)
800-900-1110 (s)
JBaymore@compuserve.com
John.Baymore@GSD-CO.com
"Earth, Water, and Fire Noborigama Woodfiring Workshop August 18-27,
2000"
Hank Murrow on sat 9 sep 00
Ronda in Virginia wrote;
>Does anyone have a recommendation for location of
>oxyprobe in a Bailey 18/12 downdraft natural gas kiln?
>Bailey recommended half way down, half way in on the
>left side but I'd like to know if anyone has any
>experience with this.
And Hank in Eugene replies;
In my Doorless Fiber Kiln, I located the OxyProbe pointing down
into the upper front corner of the roof with about 3" exposed in the
interior. The tip of the probe is about 1/2" out from but parallel to the
fiber walls, and in the corner. This avoids the likelihood of a collision
with pots and/or furniture; and I have found that I get fine readings
there. Of course, the chamber lifts up off the stack, so It is important to
have the probe out of the way. Hope you are getting clarity, Hank
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