4 accuracy of the calculated quantities, 1 accuracies in metric units, Accuracy of the calculated quantities – Vaisala HMP42 User Manual
Page 52: Accuracy of mixing ratio (g/kg)
HMI41 AND HMP42
Operating Manual
M210317EN-A
48
11.4
Accuracy of the calculated quantities
Dewpoint temperature, mixing ratio, absolute humidity and wet bulb tempera-
ture are calculated from the measured relative humidity and temperature
values. The accuracy of the calculated quantities depends on the calibration of
the probe and on performing the measurement correctly. In tables below the
accuracies of the measured values are
±2 %RH and ±0.2°C.
11.4.1
Accuracies in metric units
Accuracy of dewpoint temperature (°C)
RH/%
10
20
30
40
50
60
70
80
90
100
T/
°C
-40
1.82
1.00
0.74
0.61
0.53
0.48
0.44
0.42
-
-
-20
2.09
1.14
0.83
0.68
0.59
0.53
0.49
0.45
-
-
0
2.51
1.37
1.00
0.81
0.70
0.63
0.57
0.53
0.50
0.48
20
2.87
1.56
1.13
0.92
0.79
0.70
0.64
0.59
0.55
0.53
40
3.24
1.76
1.27
1.03
0.88
0.78
0.71
0.65
0.61
0.58
60
3.60
1.96
1.42
1.14
0.97
0.86
0.78
0.72
0.67
0.64
80
4.01
2.18
1.58
1.27
1.08
0.95
0.86
0.79
0.74
0.70
100
4.42
2.41
1.74
1.40
1.19
1.05
0.95
0.87
0.81
0.76
120
4.86
2.66
1.92
1.54
1.31
1.16
1.04
0.96
0.89
0.84
140
5.31
2.91
2.10
1.69
1.44
1.27
1.14
1.05
0.97
0.91
160
5.80
3.18
2.30
1.85
1.57
1.38
1.24
1.14
1.06
0.99
Accuracy of mixing ratio (g/kg)
with
ambient pressure of 1013.25 mbar
RH/%
10
20
30
40
50
60
70
80
90
100
T/
°C
-40
0.002 0.002 0.002 0.002 0.003 0.003 0.003 0.003
-
-
-20
0.014 0.015 0.017 0.018 0.019 0.020 0.022 0.023
-
-
0
0.08
0.09
0.09
0.10
0.10
0.11
0.12
0.12
0.13
0.13
20
0.31
0.33
0.35
0.37
0.39
0.41
0.43
0.45
0.47
0.49
40
0.97
1.03
1.10
1.17
1.24
1.31
1.38
1.46
1.54
1.62
60
2.70
2.94
3.46
3.76
3.72
4.08
4.42
4.79
5.19
5.63
80
6.78
7.80
9.00
10. 4
12.2
14.3
16.9
20.2
24.4
29.7
100
16.4
21.6
29.2
41.3
62.0
101
190
462
-
-
120
41.2
75.7
176
-
-
-
-
-
-
-
140
-
-
-
-
-
-
-
-
-
-
160
-
-
-
-
-
-
-
-
-
-