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Appendix B _______________________________________________________ Calculation Formulas
VAISALA _______________________________________________________________________ 203
APPENDIX B
CALCULATION FORMULAS
This Appendix contains the formulas used for the calculated output
quantities.
The PTU300 series transmitters measure relative humidity and
temperature. From these values dewpoint, mixing ratio, absolute
humidity and enthalpy in normal pressure are calculated using the
following equations:
Dewpoint:
1
log
−
=
A
Pw
m
T
T
n
d
(1)
P
w
is the water vapor pressure. The parameters A, m, and T
n
depend on
temperature according to the following table:
t
A
m
Tn
<0 °C
1)
6.1134
9.7911
273.47
0 ... 50 °C
6.1078
7.5000
237.3
50 ... 100 °C
5.9987
7.3313
229.1
100 ... 150 °C
5.8493
7.2756
225.0
150 ... 180 °C
6.2301
7.3033
230.0
1)
Used for frostpoint calculation if the dewpoint is negative
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 6 7
- CHAPTER 7 7
- CHAPTER 8 8
- APPENDIX A 9
- APPENDIX B 9
- APPENDIX C 9
- List of Figures 10
- List of Tables 12
- GENERAL INFORMATION 15
- Version Information 16
- Related Manuals 16
- Documentation Conventions 16
- ESD Protection 17
- Recycling 18
- Regulatory Compliances 18
- DNV Type Approval 19
- Patent Notice 20
- Trademarks 20
- Software License 21
- Warranty 21
- PRODUCT OVERVIEW 23
- Basic Features and Options 25
- Structure of the Transmitter 26
- 0604-060 27
- Probe Options 28
- 0911-067 29
- Warmed Probe PTU307 30
- INSTALLATION 31
- 133 (5.24) 32
- 59 (2.32) 32
- Thickness 32
- 9.5 (0.37) 32
- 0911-061 33
- Pole or Pipeline 34
- 0503-007 35
- 0503-041 35
- 0509-151 36
- 0503-008 36
- Panel Mounting Frame 37
- 0804-083 38
- Cable Bushings 39
- Grounding the Cables 40
- Alternate Wiring Systems 41
- WARNING 42
- 8-Pin Connector 43
- D-9 Connector 44
- CAUTION 45
- Probe Mounting 46
- 0507-024 47
- 0507-022 47
- PTU303 for General Use 48
- PTU307 for High Humidities 49
- Temperature Probe (Optional) 49
- Optional Modules 50
- Installation 51
- Warnings 52
- Third Analog Output 55
- Installation and Wiring 56
- RS-422/485 Interface 59
- Figure 33 4-Wire RS-485 Bus 61
- 1102-027 62
- LAN Interface 63
- WLAN Interface 64
- 0706-068 66
- OPERATION 67
- Display/Keypad (Optional) 68
- Reading 69
- 0604-055 70
- Missing Trend 71
- Graphic History 72
- 0706-030 73
- Information Display 74
- Menus and Navigation 75
- Rounding Setting 76
- Display Backlight Setting 76
- Display Contrast Setting 76
- Keypad Lock (Keyguard) 77
- Menu PIN Lock 77
- Configuring Display Alarms 78
- 0802-069 80
- 0802-070 80
- Serial Line Communication 83
- Service Port Connection 84
- Using the Service Port 85
- LAN Communication 86
- Wireless LAN Configuration 89
- Communication Protocol 92
- Terminal Program Settings 93
- 0810-070 94
- 0810-071 95
- List of Serial Commands 96
- Table 27 Pressure Commands 98
- Table 28 GPS Commands 98
- Table 29 Other Commands 98
- Serial Line 99
- FTIME and FDATE 102
- General Settings 103
- Limit RH Output Range 107
- Date and Time 108
- NMEA Data Format 109
- GPS Commands 110
- Using Display/Keypad 111
- Using Serial Line 112
- Data Filtering for Pressure 114
- Temperature 115
- Device Information 117
- Serial Output Settings 121
- Data Recording 125
- Deleting the Recorded Files 128
- Analog Output Settings 129
- Analog Output Quantities 130
- AMODE/ASEL 131
- Analog Output Tests 132
- Operation of Relays 134
- 1102-007 135
- Hysteresis 136
- 1102-040 137
- Enabling/Disabling Relays 139
- Setting Relay Outputs 139
- Testing Operation Of Relays 142
- Sensor Functions 143
- Manual Chemical Purge 144
- Chemical Purge in Power Up 144
- Using Buttons On Motherboard 144
- Setting Sensor Heating 147
- Display/Keypad 148
- CHAPTER 5 149
- Taking Modbus into Use 150
- Enabling Serial Modbus 151
- Enabling Ethernet Modbus 152
- 1101-034 153
- 1101-036 153
- Diagnostic Modbus Counters 155
- Disabling Modbus 156
- MAINTENANCE 157
- Changing the Sensor 158
- Error States 159
- Table 36 Error Messages 160
- Technical Support 161
- Product Returns 161
- CALIBRATION AND ADJUSTMENT 163
- 0508-013 164
- Pressure Adjustment 165
- Example: 168
- Relative Humidity Adjustment 169
- Temperature Adjustment 177
- TECHNICAL DATA 181
- Relative Humidity 182
- Optional Temperature Probe 183
- Calculated Variables 184
- 1013 mbar) 185
- Probe Option) 186
- Inputs and Outputs 187
- Mechanics 188
- Modules 189
- RS-485 Module 190
- LAN Interface Module 190
- WLAN Interface Module 190
- Data Logger Module 190
- Spare Parts and Accessories 191
- 27.5 (1.08) 193
- 116 (4.57) 194
- 183 (7.20) 194
- 92 (3.62) 194
- 12 (0.47) 194
- 120 (4.72) 194
- 106 (4.17) 195
- 42 (1.65) 195
- Temperature Probe 196
- PROBE INSTALLATION KITS AND 197
- INSTALLATION EXAMPLES 197
- PTU307) 198
- 0508-032 199
- 0508-016 200
- Cable Gland 201
- 0508-018 202
- 0508-015 203
- 0508-022 203
- 0601-044 204
- CALCULATION FORMULAS 205
- 99.621 ×= 206
- MODBUS REFERENCE 209
- Register Map 210
- 16-Bit Integer Format 211
- Measurement Data (Read-Only) 212
- Status Registers (Read-Only) 213
- Configuration Registers 213
- Exception Status Outputs 214
- Diagnostic Sub-Functions 215
- Exception Responses 216
- *M210796EN* 217
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