PA21 method for pressure calculations - WID513

WID513 User Guide
Document code
M211676EN
Revision
G
Language
English
Product
WID513
Document type
User guide

Pressure calculations compatible with the Vaisala PA21 device:

Q F E ⁢ = P o * exp ⁢   ⁡ ( Δ H ⁢   7996.0 + 0.0086 * Δ H + 29.33 * ( T − 273.16 ) )

Q N H = Q F E * exp ⁡   ( 0.03416 * H * ( 1.0 − 0.19025 * ( log ( Q F E ) − 6.92209 ) ) ⁡ 288.2 + 0.00325 * H )

Q F F = Q F E * exp ⁡   ( H 7996.0 + 0.0086 * H + 29.33 * ( T − 273.16 ) )

Table 1. Variables in PA21 pressure calculations
Variable Explanation
Po Instant barometric pressure of the sensor on the sensor height in hectopascal (hPa)
ΔH Difference in the height (m) between sensor and station height (reference point)
T Air temperature in kelvin (K)
H Station height (for example reference point) in meters (m)