STONEX R2 PLUS - Appendix III: Connect the R2 PLUS series with PDA

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Appendix I: Atmospheric correction formula and
chart (Just for reference)
Factory setting: temperature: 20℃, pressure:1013hPa, 0ppm
The correction:
Kpt＝278.960-0.2902*p/(1＋0.0036*t)
Where: p--Pressure value (hPa)
t--Temperature value (℃)
Kpt--Atmospheric correction (ppm)
Example:
t=20℃, p=1013hpa, L0=1000m.
Then: Kpt=4ppm
L=L0(1+Kpt)=1000×(1+4×10-6)=1000.004m
The atmospheric value is obtained easily with the atmospheric correction chart. Find
the measured temperature in horizontal axis, and pressure in vertical axis on the chart.
Read the value from the diagonal line, which is the required atmospheric correction
value.