Vaisala PTB210 SERIES Instruction Manual download pdf (Page 26)

Figure 2.15: Thermistor Probe Schematic

[Manual - Model 107 Temperature Probe, 4/07]

The ration of measured voltage (Vs) to the excitation voltage (Vx) is related to

the thermistor resistance (Rs), and the 1000 and 249K ohm ﬁxed resistor shown in

equation 2.3 below.

V s/V x =

1000

Rs + 249000 + 1000

(2.3)

The sensor calculates Rs from the voltage ration, and converts Rs to temperature

using the Steinhart-Hart equation in 2.4.

T =

A + B(LnRs)+C(LnRs)

) − 273.15

(2.4)

• T = temperature returned in °C

• A, B, C = coeﬃcients provided by the thermistor manufacteur

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 136 137

Test and Installation of an 1
Diploma Thesis 1
Affidavit 2
Acknowledgement 3
Abstract 4
Contents 6
Chapter 1 9
12.09.09] 11
Chapter 2 13
The Sensors 13
[http://upload.wikimedia.org/ 15
Figure 2.4: Sensing Element 16
Figure 2.10: Main Components 22
Figure 2.11: Vaisala PTB 210 23
Figure 2.17: CMOSens Chip 28
20.10.08] 28
Chapter 3 29
Data Acquisition 29
3.1.1 Connecting Panel 30
Figure 3.5: CS I/O Port 32
Figure 3.6: Peripheral Port 32
3.1.2 Peripheral Devices 33
Chapter 4 35
Programming 35
4.2 Structure 36
4.3 Declarations 37
4.4 Data Tables 40
Table 4.2: Typical Data Table 41
4.4.2 DataInterval() 42
4.5 Program - Main Scan 46
4.5.1 Instructions 47
4.5.2 Expressions 50
Chapter 5 52
The Sensors - Test Series 52
5.2 Air Duct 61
Chapter 6 62
6.2 Mounting 63
Figure 6.4: Wind Speed 65
Chapter 7 66
Evaluation 66
7.1.2 FTP Server 67
7.1.3 Test Readings 69
Figure 7.7: Pressure 70
Chapter 8 71
Conclusion 71
List of Figures 73
List of Tables 76
Bibliography 77
Appendix A 79
Appendix B 85
CRBasic - Input ﬁle CONST.CR1 85
WEATHER STATION 86
1.1 Introduction 92
1.2 The Sensors 93
1.2.2 Wind Speed 96
Lambrecht 14577 96
1.2.3 Precipitaion 99
Lambrecht 15153 99
1.2.4 Precipitaion 103
Lambrecht 15152 103
1.2.5 Solar Radiation 105
Kipp & Zonen CMP3 105
Table 1.2: Connection diagram 107
1.2.6 Pressure 108
Vaisala PTB210 108
Table 1.3: Connection Diagram 114
1.2.7 Temperature Probe 115
Campbell Scientiﬁc T107 115
Table 1.4: Connection Diagram 116
1.2.8 Temperature/Humidity 117
Campbell Scientiﬁc CS215 117
Table 1.5: Connection Diagram 118
1.3.1 Connecting Panel 119
Figure 1.26: CS I/O Port 121
Figure 1.27: Peripheral Port 121
1.3.2 Peripheral Devices 122
1.3.3 Programming 124
1.4 Wiring Panel 127
1.4.7 Power Supply - Box 130
A.1 CRBasic - Weather Station 131
A.3 CRBasic - powerup.ini 137

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Vaisala PTB210 SERIES Instruction Manual Page 26

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