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Appendix B ______________________________________________________ Calculation Formulas
VAISALA ______________________________________________________________________ 153
APPENDIX B
CALCULATION FORMULAS
This Appendix contains the formulas used for the calculated output
quantities.
The DMT346 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 T
n
<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 5 6
- CHAPTER 6 6
- CHAPTER 7 7
- APPENDIX B 7
- List of Figures 9
- List of Tables 11
- GENERAL INFORMATION 13
- Version Information 14
- Related Manuals 14
- Feedback 14
- ESD Protection 15
- Recycling 16
- Regulatory Compliances 16
- Patent Notice 17
- Trademarks 18
- License Agreement 18
- Warranty 18
- PRODUCT OVERVIEW 19
- Basic Features and Options 20
- Operating Principle 21
- Structure of the Transmitter 22
- 0604-006 23
- Probes and Cooling Set 24
- INSTALLATION 25
- 0804-066 26
- 0604-009 26
- 0804-065 27
- 0604-011 27
- 0604-012 28
- Pole or Pipeline 29
- 0604-015 30
- 0604-016 30
- Panel Mounting Frame 31
- DMT345 Probe Mounting 32
- 0604-019 33
- 0604-020 33
- Parts of the Cooling Set 35
- Instructions 36
- 0604-024 37
- 0604-025 37
- Running 38
- Cable Bushings 39
- Cable Grounding 40
- 0605-028 41
- WARNING 42
- CAUTION 43
- 0703-041 44
- Optional Modules 45
- Warnings 46
- 2006/95/EEC) 49
- Third Analog Output 50
- Alarm Relays 51
- RS-422/485 Interface 53
- 0605-034 55
- LAN Interface 56
- WLAN Interface 57
- 0706-068 59
- 8-Pin Connector 60
- OPERATION 63
- Graphic History 64
- 0706-030 65
- Menus and Navigation 66
- Changing the Language 67
- Rounding Setting 67
- Display Backlight Setting 68
- Display Contrast Setting 68
- Keypad Lock (Keyguard) 68
- Menu PIN Lock 68
- Factory Settings 69
- Display Alarms 69
- Configuring a Display Alarm 70
- 0802-070 71
- Serial Line Communication 72
- Service Port Connection 73
- Using the Service Port 74
- LAN Communication 75
- Wireless LAN Configuration 78
- Telnet Settings 81
- Terminal Program Settings 82
- 0810-070 83
- 0810-071 84
- List of Serial Commands 85
- FTIME and FDATE 88
- General Settings 89
- Using Buttons on Motherboard 93
- Date and Time 94
- User Port Serial Settings 95
- >SERI 600 N 8 1 96
- 600 N 8 1 96
- Data Filtering 98
- Device Information 98
- 0706-012 99
- Resetting the Device 101
- Data Recording 102
- View Recorded Data 103
- Deleting Recorded Files 105
- Analog Output Settings 106
- 0503-045 107
- Analog Output Quantities 108
- AMODE/ASEL 109
- Analog Output Tests 110
- Operation of Relays 112
- Hysteresis 113
- Enabling/Disabling Relays 115
- Indication Led Operation 115
- Setting Relay Outputs 116
- Testing Operation of Relays 118
- Networking Commands 119
- OPEN [nn] 121
- Sensor Functions 122
- Automatic AutoCal 123
- Manual AutoCal 123
- Sensor Purge 124
- Interval Purge 125
- Power-Up Purge 125
- Sensor Warming 126
- MAINTENANCE 127
- 0706-017 128
- Technical Support 129
- Return Instructions 129
- Vaisala Service Centers 130
- CALIBRATION AND ADJUSTMENT 131
- Adjustment Information 132
- Using Display/Keypad 133
- Using Serial Line 134
- Display/Keypad 136
- Serial Line 137
- Adjusting Temperature 138
- Adjusting Analog Outputs 140
- TECHNICAL DATA 142
- 0605-043 143
- 0604-022 144
- Modules 146
- RS-485 Module 147
- LAN Interface Module 147
- WLAN Interface Module 147
- Data Logger Module 147
- Options and Accessories 148
- Dimensions (mm/inch) 149
- 0804-035 150
- APPENDIX A 151
- CALCULATION FORMULAS 153
- 68.216 154
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