R
EFERENCE
A
NALYSIS
Clean and Label Sample Tubes on page 2 - 6
Determine the Sample Mass on page 2 - 8
Sample Tube Installation on page 2 - 10
Fill and Install the Dewar on page 2 - 12
Perform an analysis using the carbon black reference material included in the accessories kit to
verify that the instrument is operating properly. See the booklet included with the reference
material when preparing for the reference analysis.
1. Clean and label the balance tube and sample tube.
2. Determine the sample mass before degassing.
3. Degas the sample.
4. Install the sample tube (containing sample) on the sample port.
5. Install a clean, empty sample tube (of the same size) on the balance port.
6. Fill the Dewar with liquid nitrogen to about 2 cm (3/4 in.) from the top for the small Dewar
and 5 cm (2 in.) for the large Dewar.
Always handle glass Dewars with care. Any product incorporating a vacuum is a
potential safety hazard and should be treated with caution. If in doubt, contact your
safety officer.
7. Close the sample compartment door and allow the Dewar to equilibrate to ambient
conditions (approximately 30 minutes).
Ensure the sample compartment door is closed before beginning an analysis. If an
abnormal condition causes the analyzer to operate at an excessive pressure, the
sample or balance tube could dislodge from its port, possibly breaking the Dewar and
causing personal injury or damage to the equipment.
8. Press
Alt + 4
. The following prompt is displayed:
9. Press
CHOICE
until Setup
Group 1
(
N300-700
is Sample ID) is displayed. The parameters
specified in this
Set Up
group are appropriate for the reference material being analyzed.
10. At the prompts, verify or enter information at each prompt.
Reference Analysis
Gemini VII Keypad Operator Manual
239-42801-01 (Rev E) — July 2021
5 - 9
