Vaisala DRYCAP DMT340 SERIES Guia do Utilizador Página 179
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Appendix A _______________________________________________________ Calculation Formulas
VAISALA _______________________________________________________________________ 177
APPENDIX A
CALCULATION FORMULAS
This Appendix contains the formulas used for the calculated output
quantities.
The DMT340 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 Tn 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
Mixing ratio:
w
w
Pp
P
x
-
99.621 ×=
(2)
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 6 7
- CHAPTER 7 7
- CHAPTER 8 7
- APPENDIX A 8
- APPENDIX B 8
- List of Figures 9
- List of Tables 11
- GENERAL INFORMATION 13
- Version Information 14
- Documentation Conventions 14
- Recycling 15
- Regulatory Compliances 16
- Patent Notice 17
- Trademarks 17
- Software License 17
- Warranty 18
- PRODUCT OVERVIEW 19
- Basic Features and Options 21
- Structure of the Transmitter 22
- 0604-006 23
- Probe Options 24
- INSTALLATION 25
- 133 (5.24) 26
- 59 (2.32) 26
- Thickness 26
- 9.5 (0.37) 26
- 0503-041 27
- 0509-151 27
- 0503-002 28
- Pole or Pipeline 29
- Installation Kit 30
- Panel Mounting Frame 30
- 0704-002 31
- 0804-083 31
- Cable Bushings 32
- Grounding the Cables 33
- WARNING 34
- CAUTION 36
- Probe Mounting 37
- 0506-029 39
- 0503-034 39
- 0503-033 40
- 0503-042 41
- 0503-021 41
- 0503-020 43
- 0503-005 43
- Tightening the Clasp Nut 44
- 0507-043 46
- Leak Screw Installation 48
- Process 49
- 0706-001 50
- Sampling Cell for DMT348 51
- 0503-022 52
- Optional Modules 53
- Installation 54
- Warnings 55
- Third Analog Output 58
- Installation and Wiring 59
- Alarm Relays 60
- RS-422/485 Interface 62
- Figure 42 4-Wire RS-485 Bus 64
- 1102-027 65
- LAN Interface 66
- WLAN Interface 67
- 0706-068 69
- 8-Pin Connector 70
- OPERATION 71
- Graphic History 73
- 0706-030 74
- Menus and Navigation 75
- Changing the Language 76
- Rounding Setting 76
- Display Backlight Setting 76
- Display Contrast Setting 77
- Keypad Lock (Keyguard) 77
- Factory Settings 78
- Display Alarms 79
- Configuring a Display Alarm 80
- Table 12 ALSEL Parameters 82
- Serial Line Communication 84
- User Port Connection 85
- Service Port Connection 86
- LAN Communication 87
- IP Configuration 88
- Wireless LAN Configuration 91
- Communication Protocol 94
- Terminal Program Settings 95
- 0810-070 96
- 0810-071 97
- List of Serial Commands 98
- Table 25 Other Commands 100
- Serial Line 101
- Outputting Reading Once 102
- FTIME and FDATE 104
- General Settings 105
- Using Serial Line 106
- Using Display/Keypad 108
- Date and Time 110
- Data Filtering 111
- >filt ext 112
- Filter : EXT 112
- Device Information 113
- >vers 116
- DMT340 / 5.10 116
- Serial Output Settings 117
- Data Recording 121
- View Recorded Data 122
- Deleting the Recorded Files 124
- Analog Output Settings 125
- Analog Output Quantities 126
- AMODE/ASEL 127
- Analog Output Tests 128
- Operation of Relays 130
- 1102-007 131
- Hysteresis 132
- 1102-040 133
- Setting the Relay Outputs 135
- Sensor Functions 138
- Sensor Purge 139
- 1103-067 140
- 1103-066 140
- Sensor Warming 142
- CHAPTER 5 143
- Taking Modbus into Use 144
- Enabling Serial Modbus 145
- Enabling Ethernet Modbus 146
- 1101-034 147
- 1101-036 147
- Diagnostic Modbus Counters 149
- Disabling Modbus 150
- MAINTENANCE 151
- Error States 152
- Table 32 Error Messages 153
- Technical Support 154
- Product Returns 154
- CALIBRATION AND ADJUSTMENT 155
- Adjustment Information 157
- Adjusting Dewpoint T 158
- 0706-020 159
- 0706-021 159
- 0706-022 159
- 0706-023 159
- Display/Keypad 160
- 0706-024 161
- 0706-025 161
- 0706-026 161
- Adjusting Temperature 163
- Adjusting Analog Outputs 165
- Accuracy ± 3°C Td 167
- or better 167
- Water vapor saturation line 167
- Not recommended area for 167
- Operating Environment 168
- Inputs and Outputs 168
- Mechanics 169
- Probe Specifications 169
- Modules 170
- RS-485 Module 171
- LAN Interface Module 171
- WLAN Interface Module 171
- Data Logger Module 171
- Spare Parts and Accessories 172
- Dimensions (mm/inch) 174
- 92 (3.62) 175
- 116 (4.57) 175
- 183 (7.20) 175
- 0503-044 176
- 0804-059 176
- 0804-129 177
- 0704-054 177
- 0704-056 178
- 0704-055 178
- CALCULATION FORMULAS 179
- 5.2)00189.001.1()15.273( 180
- MODBUS REFERENCE 183
- Register Map 184
- 16-Bit Integer Format 185
- Measurement Data (Read-Only) 186
- Status Registers (Read-Only) 187
- Configuration Registers 187
- Exception Status Outputs 188
- Diagnostic Sub-Functions 189
- Exception Responses 190
- *M210704EN* 191
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