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Other examples are VACSEAL or VACSEAL II available
from SPI Supplies. Eurocom, Inc. Helix Technology (Granville-Philips and
CTI-Cryonics, now part of Brooks Automation) HyVac Products, Inc.
LDS Vacuum Products, Inc. Kurt J. Lesker Company MDC Vacuum Products MKS
Instruments Myers Vacuum Pascal Technologies Pfeiffer Vacuum Precision Plus Precision Scientific PTB
Sales SPI Supplies Teledyne Hastings Thermionics Vacuum Products -
Vacua Techniques Co., P.O. PTB Sales has a Manuals Directory.
A quick Internet search or business directory should turn up numerous other
possibilities as well as sources for used equipment (see below).
If you run a system on a day-to-day basis like I do here at the university, you
start to see the water hangup at 100 to 200 microns every day,
since we've been a few days having 90% humidity, it's gotten worse.
We offer free estimates on maintenance, repairs, and new
equipment installation and you approve the price before we
start. As specialists in Miele appliance repair, our team of
experts will make sure that the problem is fully explained before we start servicing your appliances.
Even a short length of tubing or a single threaded fitting
can trap a lot of contaminants which will become a pregressively greater
problem at pressures below a few hundred microns.
A probe releasing a small amount of a tracer gas is run over the
apparatus until the color of a discharge inside the
tubing changes color. Second quick test if there is a part of the system that can sustain an electrical
discharge (DC, AC, RF, Oiden coil, etc.) like a portion of
glass tubing: Water vapor is has an orange discharge color at high pressure.
Some, like Pfeiffer and Welch, have complete manuals and/or exploded diagrams and parts
lists for their equipment which may be downloaded for
free (useful for that pump you found in Grandma's attic).
I don't know if these manuals are accessible directly from the
respective equipment pages. Controlled leaks are used to admit precise quantities of gases into vacuum systems and in particular, gas lasers.
Electric dryers use 2 fuses or breakers while a gas dryer uses 1.
Reset any tripped breakers or replace broken fuses.
General Electric makes a wide range of appliances
that have given the homeowner an edge that previous generations could only dream about.
3. The resolution of the gauge should be enhanced, if possible,
very much beyond what would otherwise be considered sensible given the accuracy of the underlying technology.
Many of the simpler analog TC gauges are surprisingly sensitive to line voltage variations, a constant voltage transformer might be
needed if your line is given to periodic variations. A 4.5 digit DVM in series
or parallel with the analog readout of a traditional vacuum gauge is a good example.
If you suspect a leak is causing 1 to 100 microns of trouble, use a thermal
gauge. If a slow leak is present, the pressure will drop while the
relatively 'thick' liquid is being sucked through the hole.
However, an Oudin coil won't work around metal components since
they will attract the discharge even if there is a hole you could drive a truck through nearby!
Epoxy/Torr Seal might also work but not being solvent based,
it won't solidify immediately and there is a risk that it will just get
sucked through the hole to reappear inside your vacuum
vessel! If a solution of something like shellac dissolved in alcohol
is painted on instead, in addition to the immediate effects, the solvent will
quickly evaporate in the vacuum and what remains will
plug the leak.
Only other thing that has that kind of vapor
pressure would be something like formaldehyde. Thus,
if the pressure continues to decrease on average (there could be times where pockets of "stuff" are released
and pressure may rise slightly), one or more of these fake leaks may be
present. From an item perspective, appliances were not
more stylish, and features drove (even if they needed repair more).
No harm to the food, just more energy to keep it cool!
However, this does not give you the liberty to push your luck and keep using it without maintaining
the refrigerator. I have found I can detect and pinpoint about %98 of real vacuum
leaks using helium and virtually any indirect
reading vacuum gauge suitable for the range of interest.
With the gauge loose from the dash, you should be able to pull it forward and
examine the wires that need to be disconnected.
I haven't tried it with a discharge tube type gauge but I suspect it
should work to some degree. Gas leak detector. Since the presense of trace
amounts of some gases will change the color of an electrical discharge dramatically, this provides a means of detecting a leak in a system where a DC or
RF electrical discharge can be generated.
my website www.register.sblinks.net |
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