Morning David,
At 11:09 AM 6/6/04, you wrote:
I agree, it does not make sense. In fact I have trouble keeping dust OUT
of my computer. It acts like a vacuum cleaner. The fans suck air in. I
have to vacuum the dust out about 3 times a year.
Of course, it is pumping air, 24-7 in some cases.
I find many offices that are so dirty, power supplies fail for this one
reason. In one case, I have replaced 3 power supplies in the same computer
for that reason. So.... this keeps me in touch with the customer.
My best power supply, "PC Power and Cooling", has 57464.4 hours ( just
checked, not depending on memory)
How do I know? Before I put this one on my desk, I installed an hour meter
and a digital thermometer.
( both were the same models I used in the medical product I was
manufacturing at the time )
During this time, I have fully disassembled and cleaned the dirt out, and
carefully cleaned the fans several times.
This power supply will deliver 35 Amps at 5 volts. One of the
best. Today, they are a dime a dozen, but not one in the class with this
supply.
I have designed and installed air filters for computers. I have considered
a nice metal frame with quick
change filters.
Most people maintain their computer like they do their body..... As long
as it runs, lever-B.
One more interesting aspect of air and lint. The medical product I
designed and built in the early 90's was an "Air Therapy Control
System". Yes, it has a fantastic air pump and air filter. ( DC speed
Control )
The pump and air filter system, along with a noise baffle was my greatest
challenge. I spent a week working with a DB meter and perfecting the noise
baffle. The motor noise was coming out the Air Intake.
Wow, ..... was that fun.
This critter was portable and the small unit weighed only 32 pounds. It
hung on the foot of the bed and inflated a breathable air mattress. There
were 4 sections, head, back, seat, and foot. Each section must have
different air pressure for the comfort of the patient. 100 pound patients
and 250 pound patients alike.
When the hospital bed head was elevated, extra weight was applied to the
seat. So.... I had to automatically sense the elevation, and apply extra
pressure to the seat section. It also had a CPR Switch.
The digital pressure readout showed the pressure in each section. This was
manually selectable for the 4 sections as it had only one pressure
indicator. This meter, plus the transducers was a major cost of the unit.
Pressure transducer was made my Motorola, gold plated, and had a range from
0 to 1.5 psi.
To this day, no one knows how I selected the pressure standard and achieved
calibration.
Later, a nationally recognized wound therapist, pressure expert, tested on
of these units, complete with mattress, and was well pleased with the readings.
So simple.... I used a blood pressure monitor under a persons head, back,
seat, and foot. I ran a few test in this manner, documented the
readings, and BINGO, I had a set of standards in mm Hg.
The point I intended to make, other than those above, is that hospital
rooms are filled with WHITE LINT.
The machines would fill up with it, after a few thousand hours. They did
of course require maintenance, but many ran for 30,000, 50,000 and 75,000
hours.
Considering the daily rent revenues, these were money makers for the
company that purchased them.
The second generation became more intelligent with communications and self
test built it.
I will try to scan a few brochures and post a few pictures. These were
very pretty machines, in my biased opinion.
Wayne
--
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