ARES-G2 Getting Started Guide
Page 69
•
Make sure the geometries align with each other properly and that the gap is properly zeroed.
•
When using the oven, close the oven door carefully to ensure that the sample or geometry does not
interfere with the door.
•
While loading the sample onto the geometry, ensure that the sample is centered, as well as is possible,
between the mounting surfaces. Off-center loading may cause misalignment of the transducer/motor
shafts. Additionally, misalignment may also affect the accuracy of the data. If misalignment does
occur, the sample should be removed and carefully reloaded.
•
When testing at temperatures below ambient temperature (or the temperature at which the sample was
loaded), the clamps on some geometries may loosen as they cool. This is due to difference in the ther-
mal expansion coefficients of the sample and that of the geometry. Before initiating testing at the low-
est 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 dan-
gerous cryogenic temperatures.
Installing the Upper Geometry
NOTE
: The Upper PRT should only be used if an FCO Environmental system is being used and Parallel
Plate or Cone/Plate geometries are being used.
To install an upper geometry follow these steps:
1
Loosen the knob on the transducer mount.
Figure 42
Upper PRT installed.
2
Insert the transducer PRT into the opening. While applying light upward force, rotate the PRT until it
slips into place, indicating that the PRT has aligned with the keyway in the electrical jack. When properly
installed, it will register the ambient temperature. See the figure to the right.
3
Obtain the desired geometry. Make sure there is no dirt or dust at the location surfaces for parallel and
concentric alignment. Holding the geometry by the shaft, carefully slide the geometry over the PRT.
The PRT temperature sensor is spring loaded and will need to be pushed upward as far as it will go then
hold it in place.
Knob
PRT
