Medisoft FeNO+ - Important information on barometric pressure

H11-EN Calibration P
AGE 18/31
5
Only if spirometry option is available
The ambient conditions are used to calculate BTPS correction factor. It is
essential that ambient conditions are measured or encoded correctly for
accurate volume measurement:
• Temperature: in degrees Celcius
• Relative humidity: in %
• Barometric pressure: in mmHg
Important information on barometric pressure
The barometric pressure used by the software is the actual barometric
pressure, not barometric pressure corrected at sea level. Be careful when
using an external weather station because it always indicates barometric
pressure corrected at sea level, depending on the altitude of the location.
In order to obtain the real barometric pressure, the formula below can be
used:
BP

 BP



1
0.0065h
288.15

.
Where:
- BP
corr
is the barometric pressure (in mmHg) corrected at sea level, as
indicated on all external weather stations
- h is the altitude (in meters)
Example: a weather station indicates 760 mmHg at an altitude of 250 meters.
This will correspond to a real barometric pressure of 738 mmHg.