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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.
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