4 pressure, 5 analogue outputs, 6 electronics – Vaisala HMP260 User Manual
Page 61
HMP260 SERIES
HMP260-U017en-1.5
Operating Manual
1997-11-25
55
Accuracy of wet bulb temperature (°C)
Relative humidity
Temp.
10
20
30
40
50
60
70
80
90
100
-40
0.20
0.20
0.20
0.20
0.20
0.20
0.20
0.20
-
-
-20
0.21
0.21
0.22
0.22
0.22
0.22
0.23
0.23
-
-
0
0.27
0.28
0.28
0.29
0.29
0.29
0.30
0.30
0.31
0.31
20
0.45
0.45
0.45
0.44
0.44
0.44
0.43
0.43
0.42
0.42
40
0.84
0.77
0.72
0.67
0.64
0.61
0.58
0.56
0.54
0.52
60
1.45
1.20
1.03
0.91
0.83
0.76
0.71
0.67
0.63
0.60
80
2.23
1.64
1.32
1.13
0.99
0.89
0.82
0.76
0.72
0.68
100
3.06
2.04
1.58
1.31
1.14
1.01
0.92
0.85
0.80
0.75
120
3.85
2.40
1.81
1.48
1.28
1.13
1.03
0.95
0.88
0.83
140
4.57
2.73
2.03
1.65
1.41
1.25
1.13
1.04
0.97
0.91
160
5.25
3.06
2.25
1.82
1.55
1.37
1.24
1.13
1.05
0.99
The formulas used in calculation of dewpoint, mixing ratio and absolute hu-
midity are presented in Appendix 6. However, when measuring in a high
ambient pressure using HMP264 some corrections are needed in the
calculations. These corrections can be made according to the instructions in
Appendix 6.
8.4
Pressure
Pressure range of the HMP264
0...10 MPa (0...100 bar)
sensor head
8.5
Analogue outputs
Two analogue outputs selectable
0...20 mA
4...20 mA
0...1 V
0...5 V
0...10 V
Typical accuracy of analogue output
±0.05 % full scale
at +20 °C
Typical temperature dependence of
0.005 %/°C full scale
analogue output
8.6
Electronics
User interface
3 keys and 4 LEDs inside the housing
or local display keypad
Display
2 x 16 character alphanumeric high-
contrast, wide view angle LCD
character height
3.85 mm (0.15")
Keyboard
1 x 4 keypad