Marshall, I am using a unit very similar to the one you have here in
the Ebay link. Bought mine off Ebay in Australia, and it works just
fine. Paid 26 dollars Australian which is probably around 21 dollars American.
Not claiming that my results are totally perfect as I have nothing to
compare them with but going by the descriptions I have read in the
emails here on the list, the results are fine and doesn't need an
expensive unit.
At 03:51 AM 27/08/2009, you wrote:
That seems overpriced. Can one not use units such as this one?
New Digital Ultrasonic Jewelry Watch Denture Cleaner 18
$25.99
http://cgi.ebay.com/New-Digital-Ultrasonic-Jewelry-Watch-Denture-Cleaner-18_W0QQitemZ300290481856QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item45eab51ec0&_trksid=p3286.c0.m14
Marshall
Brooks Bradley wrote:
Although I made only a passing comment in one of my earlier posts,
it is of some moment that I elaborate on possible temperature
effects upon Ultrasonic system operation.
First, do remember that the VOLUME of liquid in the cleaner tank is
of consequence. The temperature of the liquid component will, in
most cases, rise somewhat with the passage of time (especially in
cases of uninterrupted operation). This should not be of great
concern to the experimenter....IF there is always sufficient volume
of liquid in the tank. MOST ultrasonic cleaners (even the cheaper
ones) have fill marks on the sides...one for Minimum and one for
Maximum. For obtaining the most acceptable results in MOST
operations such as the one I outlined for the Encapsulation
experiment....it is advisable to fill the tank to at least the 2/3
level...but ABSOLUTELY
WELL ABOVE MINIMUM. There is little danger of overheating the
vitamin C to a point of compromise.....but THERE IS some danger of
damaging Barium Titanate or Electromagnetic
type transducers (especially the cheaper ones)...and the Harbor
Freight unit IS one of the cheaper ones. Actually, the general
likelihood of damaging, even the Barium Titanate transducers would
only occur in cases where the experimenter "heated the liquid"
before starting the US unit.
Because of the additional, useful, features on the larger (2.5
liter) ultrasonic
cleaner available at Harbor Freight (Item #95563)....it should be a
better buy ($60.00)for persons desiring to make larger quantities
of encapsulation candidates. However, the smaller unit should be
quite adequate for the individual experimenter.
Sincerely, Brooks Bradley.
---------[ Received Mail Content ]----------
*Subject : *Re: for Jim Holmes CS>heat and vitamin c
*Date : *Tue, 25 Aug 2009 12:46:36 -0400
*From : *[email protected]
*To : *[email protected]
Main concern would be overheating the transducer and destroying it.
Time your work with a kitchen timer thingy that will chime.
Chuck
My arm! said Captain Hook offhandedly.
On 8/25/2009 9:42:40 AM, arthur rambo ([email protected]) wrote:
> My Ultrasonic cleaning unit sometimes runs on without stopping,
and the
> liquid heats up a bit. I am wondering if it might cause the
ascorbic acid
> to degenerate. Any opinions?
>
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