STONEX R2W PLUS 500 - Appendices; Atmospheric Correction Formula and Chart

R2W PLUS
81
Appendix I: Atmospheric correction formula and chart(Just
for reference)
Factory setting: temperature: 20℃, pressure:1013hpa, 0ppm
temperature: 20℃, pressure:1013hpa, 0ppm
The correction:
Kpt＝274.417-0.2905*p/(1＋0.0036*t)
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=0ppm Kpt=4ppm
L=L
0
(1+Kpt)=1000×(1+0×10
-6
)=1000.000m
L=L
0
(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.