Micromeritics GEMINI VII KEYPAD, Руководство оператора

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2 Operational Procedures
M
EASURE
S
ATURATION
P
RESSURE
Alt + . (decimal)
Press CHOICE to display the options. Press ENTER to select.
The saturation pressure can be measured in the:
n
Sample tube (all Gemini VII 2390 models)
n
Po tube (Gemini VII 2390 p and 2390 t only)
To measure the saturation pressure (P_0):
1. Attach an empty sample tube to the analysis port. This sample tube must be the same size
as the tube attached to the balance port. Do not place sample in the tube; an erroneous Po
reading occurs when sample is in the tube.
Sample tubes on the ports do not have to be installed if measuring the saturation pres-
sure in the Po tube but should be plugged if tubes are not installed.
2. Add liquid nitrogen (LN
2
) to the Dewar.
3. Place the Dewar support on the elevator, then place the Dewar on the support. A Dewar
support is not necessary for the larger Dewar used with the Gemini VII 2390 t . Place the
Dewar directly on the elevator.
4. If adding LN
2
to an empty Dewar, allow the temperature of the LN
2
to stabilize (approx-
imately 30 minutes).
5. Press Alt + . (decimal).
6. Select Sample Tube or Po Tube .
7. Press ENTER twice to begin the measurement or press Alt + CLEAR at any time to cancel
the measurement.
When the measurement is complete, the saturation pressure is stored in memory and used in
report calculations.
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Gemini VII Keypad Operator Manual
239-42801-01 (Rev E) — July 2021