MBW 973-SF6, Operation Manual

Page: 23 / 49

MBW973-SF6_MANUAL_E_V3.1
19
Measurement
Measurement without SO
2
Option
This section describes the measurement sequence for the 973 without the SO
2
option. Please
refer to page 21 for the equivalent procedure for instruments equipped with the SO
2
option.
If you intend to collect the measurement data automatically, please install the Excel Protocol
sheet, as described on page 25, before the start of the measurement.
As soon as the 973 is connected to the gas compartment,
the current vessel pressure is indicated. The standard con-
figuration for the pressure unit is kPa absolute. The input
pressure range is 120…1’000 kPa abs.
When the instrument is switched on, the standard measur-
ing mode with
Humidity Measurement , % Volume SF6
Measurement and Pump Back After Measurement is ac-
tivated.
Press the Start button. The Start button and the Pump but-
ton turn green. Because the SO
2
measurement is disabled,
an X appears next to SO2 . The pump starts and the humidi-
ty clock, located next to the Start button, begins to spin.
During the measurement, SF
6
gas flows from the gas
compartment, through the hose, through the measuring
head, and into the internal storage cylinder. The internal
cylinder trend arrows and level indicator show the rising
pressure in the internal storage cylinder.
After completion of the humidity measurement, the spinning
clock stops. Both the measured Frost/Dew Point and the
humidity content in ppm
v
are displayed.
Then the % Volume SF
6
measurement starts and the
corresponding clock begins to spin.
The internal cylinder trend arrows and level indicator show
the rising pressure in the internal storage cylinder.