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Across International
- Thread starter Green Dot Labs
- Start date
Cabinet counter top businesses and shops handling marble wall and floor tiles are a couple. Google marble tiles and watch the choices.
You need a reasonably non porous thermal mass to act as a stable heat sink. The material is multiple choice, with the need for mass the central issue.
Cascade TEK has individually electrically heated and controlled shelves as an option on their ovens.
UNREGISTRD
Active member
So Ive noticed HYDRION SCIENTIFIC has Aluminum shelves and emailed them asking for replacements and was told 150$
I think im going to bed/bath beyond and going to buy some nice aluminum cookie sheets and cut them to size for my shelfs...
These wire racks are useless!! Has regis posted a link?
FTW
a must have for all ovens IMO....
yepp. cant wait till you get done with the new oven gw!! ill clear a spot on the shelves as soon as thats done!
Silicone heat mats, each with it's own sensor and PID controller. The only way to get perfect tracking is to directly monitor the oil temperature, IR temperature sensors should do, since this is a low temperature specific oven. They start at about $150 each,
http://www.omega.com/subsection/fixed-mount-infrared-thermometer.html
Just mount a sensor pointed down above each heat mat.
If you place soft padding/insulation under each heat mat, the mat will tend to conform to the uneven (concave) outside, bottom surface of many Pyrex dishes. I doubt you'll find any dishes that are perfectly flat on the bottom, and it would be necessary to ensure good contact with a solid heated shelf.
For the silicone heat mats (they're called heaters,) 1.25 watt per square inch is plenty, and should be able to withstand full power in free air. Here's a Temperature versus Wattage in fiberglass heaters graph, http://www.omega.com/toc_asp/frameset.html?book=Heaters&file=Intro_flexheaters
The 1.25's are the SRP Series from Briskheat, Briskheat sells direct, Grainger's also carries them, so does this place,
http://www.oemheaters.com/c-541-srp-series-125-wsq-inch.aspx
That, and the box and you're good to go. The window should be large enough to allow full viewing of all levels so you can adjust the action on the fly...
Of course you can also toss your oil on parchment in there, right on the heat mat. You can even mix Pyrex and parchment, why is radiant heat still even being considered?
And tonight's the longest night...blessings!
FE, are you using the Cascade Teks? Those things are PRICEY!!
That is pretty awesome. I just pulled the trigger on an AI myself, but I am thinking my next upgrade will be a custom solution as you are describing. I was thinking of buying a used vacuum chamber and having my machinist equip it with several PIDs and IR sensors for each rack.
Why aren't you already doing this?!
I haven't even tested a silicone heat mat under vacuum, but I posted anyway, as the company GW's working with should should know exactly where to obtain the perfect heat mats for the purpose.
analogcricket
Member
What do you guys think about this Hydrion?
http://www.ebay.com/itm/1-9-Cu-Ft-A...284?pt=LH_DefaultDomain_0&hash=item25820613ac
http://www.ebay.com/itm/1-9-Cu-Ft-A...284?pt=LH_DefaultDomain_0&hash=item25820613ac
UNREGISTRD
Active member
Another guy has one have u seen this link?
https://www.icmag.com/ic/showthread.php?t=269763
I think there probably the same dam thing although across has a better temp controller etc for our low temps..
@analogcricket... Im thinking the thinnest possible...
I use a hydrion. Im happy with it. There are a few different temp controller options. One is for low heat applications. The temp read out is C and the pressure gauge is MPa. They are going to offer the mercury gauges soon but thats 4 months away.
analogcricket
Member
if its thin its not gonna regulate heat as well... GW was saying he was using 1" marble slabs.. have 4x 1" slabs would take up a lot of space... just trying to maximize space and regulate heat the best way possible..
The one linked to is limited on purpose to 500 watts, I don't think you guys have tried it yet.
"The VDO-53B desktop vacuum drying oven features a 1.9 cu. ft (53 Litre) easy to clean stainless steel heating chamber, in which the heat is distributed evenly throughout the electropolished inner chamber without hot spot. The heating elements are carefully selected to heat gently, which improves accuracy close to room temperature. The low-loss heat transfer to the samples uses highly heat-conductive anti-corrosion electroplated aluminum plates, as well as 3-edge large surface contact between sample plates & rack holders (the same design has been used by world-leading brands such as Binder). The VDO-53B can operate from 9°F (5°C) over ambient temperature to 150°F (65°C), with temperature accuracy of +/-0.9°F (0.5°C)."
"Model VDO-53B (110V)
Brand Hydrion Scientific
Product Type Desktop Vacuum Drying Oven
Voltage (+/- 10%) 110 V 50/60 Hz
Power 500 W
Chamber Volume 1.9 cu. ft (53 Litre)"
UNREGISTRD
Active member
Well never be able to have the same temp on each shelf..The bottom will always be what the therm is set at and the top will be about 5deg less. Yes I have Thick marble on the bottom of the oven to evenly distribute the heat. that way the front or back is not hotter than the other..
They Hydrion oven comes with aluminum shelves NOt wire racks so im thinking Good Cookie sheets are made out of aluminum so that they cook evenly as well so whats the difference..
Thats the one. I've never had it over shoot which is the best thing about it, it was pretty much plug n play. After having an across over shoot big time, a low temp controller was crucial......AI is offering that too now.
