COSA Xentaur SF6 Purity Pro - Manual (Page 11)

11
2-6. AIR CAL CAUTION
If the temperature inside of the sensor has changed over ±10ºC from the last time the AIR CAL was
performed, [CAUTION/CHECK AIR CAL] will be displayed in order to prevent zero drifting.
[Measuring Gas/Base Gas] and [AIR CAL] are displayed consecutively.
If the [CAUTION/CHECK AIR CAL] is displayed, perform the AIR CAL based on the procedure below:
AIR CAL Procedure
1. Press the PUMP key and let it sample fresh air.
2. When the indication becomes stable, stop the pump with the PUMP key and press the AIR CAL
key
Caution
Before pressing the AIR CAL key, allow the instrument to sample enough fresh air (ideally for two
minutes.) Otherwise, the correct measurement cannot be acquired.
Caution
When the measurement starts, confirm if the AIR CAL value is displayed after the fresh air is
sampled enough. If the AIR CAL value is not indicated, or if [AIR CAL CAUTION] is not displayed, be
sure to perform the AIR CAL procedures correctly.