RSA-G2 Getting Started Guide
Page 60
Basic Instructions for Geometry Installation
The following instructions provide general information for installing a geometry on the RSA-G2. Refer to
TRIOS online help for further information.
General Guidelines
Following geometry installation, be certain to:
• Place the lower geometry on the motor shaft and tighten the set screws.
• Place the upper geometry on the transducer shaft, and tighten the set screws.
• Perform a geometry mass calibration following the instructions found in
or directly enter the mass when selecting or setting up the geometry in TRIOS software. The
geometry mass calibration must be performed or entered the first time a new geometry is used. The
software will store the geometries’ mass for future use.
NOTE
: This calibration applies only to the geometry on the transducer shaft.
• Perform zero fixture before loading the sample. Refer to your specific geometry’s TRIOS Help topic
for additional information.
Follow these guidelines:
• When mounting the geometries, orient them so that the sample will be accessible to the sample PRT
(mid-oven). For the most accurate sample temperature, the sample PRT should be moved to near the
sample.
• Make sure that the sample PRT does not actually touch the sample (or geometry). Close the oven care
-
fully until you are sure the sample PRT is adjusted properly. The alignment pins allow the geometries
to be rotated in 90 degree increments. Often, rotating the geometry 90 degrees will place the sample in
a position where the PRT can be placed close to the sample and not the geometry itself.
• While loading the sample onto the geometry, ensure that the sample is centered between the geometry
mounting surfaces. Off-center loading may cause misalignment of the transducer/motor shafts, result
-
ing in the appearance of an overload signal. Additionally, misalignment may also affect the accuracy of
the data. If misalignment does occur, the sample should be removed from the geometry and carefully
reloaded.
• When testing at temperatures below ambient temperature (or the temperature at which the sample was
loaded), the clamps may loosen as they cool. This is due to difference in the thermal expansion coeffi
-
cients of the sample and that of the geometries. Immediately prior to initiating testing at the lowest test
temperature, you may wish to open the oven door and verify that the screws securing the clamps are
tight, taking care not to touch any surface of the oven or geometries which may be at dangerous
cryogenic temperatures. Axial force control should be used to maintain the integrity of clamped
samples.
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