Vaisala HMT120 User Manual Page 79
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Appendix A _______________________________________________________ Calculation Formulas
VAISALA ________________________________________________________________________ 77
APPENDIX A
CALCULATION FORMULAS
This appendix contains the formulas used for the calculated output
quantities.
HMT120 transmitter receives relative humidity and temperature from the
HMP110 probe. From these values dewpoint, frostpoint, absolute
humidity, mixing ratio, enthalpy, wet bulb temperature, saturation vapor
pressure and vapor pressure in normal pressure are calculated using the
following equations.
Symbols:
T
d
=
Dewpoint temperature (°C)
P
w
=
Water vapor pressure (hPa)
P
ws
=
Saturation vapor pressure (hPa)
RH
=
Relative humidity (%)
x
=
Mixing ratio (g/kg)
p
=
Atmospheric pressure (hPa)
a
=
Absolute humidity (g/m3)
T
=
Temperature (°C)
h
Tw
Tdf
=
=
=
Enthalpy (kJ/kg)
Wet bulb temperature (°C)
Dew/frostpoint temperature (°C)
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 5 4
- CHAPTER 6 5
- CHAPTER 7 5
- APPENDIX A 5
- List of Figures 6
- List of Tables 6
- GENERAL INFORMATION 7
- Version Information 8
- Related Manuals 8
- Documentation Conventions 8
- Recycling 9
- Regulatory Compliances 10
- Patent Notice 10
- Trademarks 10
- License Agreement 10
- Warranty 10
- PRODUCT OVERVIEW 11
- Interchangeable Probe 12
- Accessories 12
- Optional Display 12
- Constant Output Probe 13
- Transmitter Components 14
- INSTALLATION 15
- Mounting 16
- 1011-150 17
- 1303-034 18
- Duct Installation Kit 19
- 0505-177 20
- 0505-178 20
- Probe Mounting Flange 21
- Probe Mounting Clamp 22
- Connections 23
- 1011-152 24
- SERVICE PORT 25
- 0807-004 27
- List of Serial Commands 28
- Show Device Information 29
- Set/Show Calibration Date 30
- Show Analog Output Status 32
- Serial Line Output Commands 33
- Stop Continuous Outputting 34
- Set/show Output Interval 34
- Output a Reading Once 34
- Calibration Commands 35
- Calibrate Analog Output 37
- Set/Show Terminal Echo 38
- Configuring Analog Output 40
- Examples: 41
- Test Analog Outputs 42
- Other Commands 43
- Set/show Output Formatting 44
- Display Command List 45
- Display Active Errors 45
- Save Changed Settings 45
- Restore Saved Settings 46
- Reset Transmitter 46
- Restore Factory Settings 46
- Set/show Output Unit 47
- MAINTENANCE 49
- Fixed Probe Model 50
- Remote Probe Model 51
- Calibration and Adjustment 52
- Adjustment with HM70 56
- Reference Probe 57
- 0505-185 58
- 0505-186 58
- LiCl-NaCl Adjustment 59
- Calibrated Reference Probe 60
- Adjustment with HMI41 61
- Offset and Gain Adjustments 63
- MODE. The following display 65
- Troubleshooting 66
- Analog Output Tests 67
- TROUBLESHOOTING 69
- Solving Typical Problems 70
- Technical Support 71
- TECHNICAL DATA 73
- Table 12 Inputs and Outputs 74
- Options and Accessories 75
- Transmitter Dimensions 76
- 1011-159 77
- CALCULATION FORMULAS 79
- Dewpoint Temperature 80
- Dew/frostpoint Temperature 80
- Mixing Ratio 81
- Absolute Humidity 81
- Enthalpy 81
- Saturation Vapor Pressure 82
- Water Vapor Pressure 83
- *M211244EN* 87
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