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Or Exploring the myths of buying
used equipment
Myth #1. Old equipment is not
reliable.
Instruments such as analytical X ray require great mechanical
stability in order to achieve accurate, reproducible results.
The mechanical components of X ray diffractometers and spectrometers
are made much stronger, larger, and more
precise than the sample weight (usually only a few grams or ounces)
requires. It is therefore unusual to find even a heavily used
instrument showing signs of wear. Occasionally some components
are corroded by sample emissions but these are contained in the
sample changer area and can be replaced, repaired, or replated
if necessary.
Myth #2. The "old"
electronics are unreliable.
In the 1960's and early 1970's, when automated analytical X ray
was being developed, the electronic components controlling them
were not particularly sophisticated. Due to breakthroughs in
electronic technology, instruments manufactured from the mid
1970's were constructed incorporating much more reliable, inexpensive,
and readily available components such as TTL logic CMOS logic
and transistors, etc. enhancing stability, precision, and reliablity.
Complete reconditioned systems are now available for sale or
as sources of any part, should the need arise. The defective
part can then be repaired, tested, and returned to service.
Myth #3. The software is obsolete.
One area which has been consistantly upgraded by manufacturers,
is software. While the latest software upgrades
for older instruments are available from the manufacturer, they
are usually cost prohibitive. There are, however, other sources
for software upgrades. In the area of X ray diffraction, several
companies offer software as good as, or better than, any
diffraction software currently available from the original equipment
manufacturer (references are available upon request).
In spectrometry, software is available which meets the needs
of
most users, but a Windows version is being evaluated. Call for
an update. |