COSA Xentaur SF6 Purity Pro - Manual (Page 8)

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completed, press the PUMP key and let the sample gas draw into the
instrument. The color of the display will reverse while the pump is operating. *Note that the
indication on display under pump operation is not measuring result.
6) After the indication on the reverse display becomes stable, the pump will stop the
operation and read out the indication as a measuring result at this pump operation stop. At
this pump operation, stop under the gas flow ceasing condition. This is the measuring
result.
Caution
Press the AIR CAL key after confirming that there is enough fresh air in the chamber, or else the correct
measurement cannot be achieved.
*Note
If the [AIR] is selected as the base gas, the indication will show a zero when the AIR CAL key is
pressed. However, if the [N2] or other gases except [AIR] are selected as the base gas, the
indication will not show a zero, bur rather other values determined based on the combination of
the measuring gas and the base gas. This is caused by sampling the gas which is not on target (in
this case, the air.) Note that the instrument is not broken. Once it samples the target gas, it shows
a correct reading. Depending on the combination of the measuring gas and the base gas, the AIR
CAL value may be a negative value. For further information, refer to the measuring gas
specification.
Caution
RK60000 performs best when both the Gas Chamber and Reference Chamber are at the atmospheric
pressure (101.3 kPa.) While the measuring gas is being sampled, the pressure in the Gas Chamber
will become slightly different from the atmospheric pressure, and the analyzer will not show the correct
reading. Read the indication after the gas flow stops.
*Note
RK60000 measures the gas best when both the Gas Chamber and Reference Chamber are at
101.3 kPa. If precise measurement is required, perform the pressure correction by the following
method:
Pressure Correction = ______101.3 kPa______ X (Reading – Air Cal. Value) + Air Cal Value
Pressure at measurement [kPa]