MBW 973-SF6, Руководство по эксплуатации

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20
MBW973-SF6_MANUAL_E_V3.1
After completion of the % volume SF
6
measurement, the
spinning clock stops and the measured % volume SF
6
is
displayed.
Finally, the pump back starts and the trend arrows and level
indicator show the decreasing pressure of the internal stor-
age cylinder. The mirror is heated at the same time, indi-
cated by the red
Start key. During the heating phase the
Start key is locked out.
At the completion of pump back, the measuring head pres-
sure is reduced to 100 kPa abs. (approximately atmospher-
ic pressure). After stabilization of the displayed gas com-
partment pressure (approx. 5 seconds), the measurement
results are now available on the data lines as well as on the
serial interface for data transfer to the excel protocol (see
page 25).
The measurement data for humidity and % volume SF
6
re-
main stored and displayed until the next measurement is
started by pressing the
Start button. The vessel pressure
measurement always indicates the current pressure at the
973 sample gas input. After completion of the measure-
ment, the gas compartment pressure remains properly indi-
cated as long as the sampling tube is connected to the gas
compartment.
After connection of the sampling tube to the next gas com-
partment, the next measurement can be started by pressing
the
Start button.
Termination of Measurement
After completion of the measurements, disconnect the SF
6
coupling from the gas compartment
and close it with the yellow screw cover. Then disconnect the quick coupling from the 973 and
cover the gas inlet as well as the coupling of the tube with the blue caps. The last measured SF
6
remains in the sampling tube. A correctly closed sampling tube is protected from dust and ambi-
ent air.
If the measurement was stopped with a normal pump back sequence, 100 kPa abs. pressure
(~0 kPa gauge) will remain in the internal storage cylinder. The instrument can now be correctly
transported.