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Cryoscope Sample Probe Versions FAQ Advanced
™
Osmometer 3250/Cryoscope 4250 Service Manual
Cryoscope Sample Probe Versions FAQ
Cryoscope Sample Probe Versions
Frequently Asked Questions (FAQ)
4DP002 Rev1
(4D35/4C35/3255 Service Manual)
Page 1 of 2
A new, composite, stainless steel and plastic
body cryoscope sample probe has been
released for use in the Advanced Instruments,
Inc. single and multi-sample cryoscopes
(Models 4D3, 4C3 and 4250).
A) What is the difference between the three
versions of sample probe?
Answer
: Only the body material is differ-
ent. Type Aused a brazed stainless steel
body; Type B used a one-piece plastic
body; and Type C uses a composite stain-
less steel and plastic body. All three use
the same high accuracy glass thermistor
as the sensing element.
B) Is this new probe used in the osmome-
ters?
Answer
: No, this change is only for
cryoscopes and does not affect the all-
stainless steel body sample probe used in
the osmometers.
C) Why has the design been changed?
Answer
: The stainless steel probe, Type
A, exceeded the thermal conductance lim-
its specified in ISO 5764, therefore, the
plastic probe, Type B, was developed to
meet these new requirements. Type B,
although compliant with the new ISO
5764 standard, proved to be difficult to
manufacture, which has led to the com-
posite design probe, Type C. This design
uses the strength of stainless steel up in
the mandrel, yet has the lower thermal
conductance of plastic where the probe is
immersed in the sample.
D) My cryoscope has been operating without
any problems. Do I need to change the
probe? Will I see any performance
change?
Answer
: If your cryoscope needs to be
compliant to the ISO 5764 standard and
you are currently using a Type Aprobe,
A
B
C
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside
North America +US 1-781-320-9000).
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