Vaisala HUMICAP HMP41 Guia do Utilizador descarregar pdf (Página 89)

Appendix A ______________________________________________________ Calculation Formulas

VAISALA _______________________________________________________________________ 87

Mixing Ratio

The mixing ratio (mass of water vapour/mass of dry gas) is calculated

using:

p-P

Bx 





kgg /

(3)

where

B = 621.9907 g/kg

The value of B depends on the gas. 621.9907 g/kg is valid for air.

Absolute Humidity

Absoute humidity is defined as the mass of water vapour in a certain

volume. If ideal gas behaviour is assumed the absolute humidity can be

calculated using:



15.273







/ mg

(4)

where

C = 216.679 gK/J

Enthalpy

Entalpy can be calculated from mixing ratio using:

xxTh







 5.2)00189.001.1(





kgkJ /

(5)

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 95 96

USER'S GUIDE 1
Table of Contents 3
CHAPTER 4 4
CHAPTER 5 5
CHAPTER 6 5
CHAPTER 7 5
APPENDIX A 6
List of Figures 7
List of Tables 8
GENERAL INFORMATION 9
Version Information 10
Related Manuals 10
Documentation Conventions 10
ESD Protection 11
Recycling 11
License Agreement 12
Regulatory Compliances 12
Patent Notice 12
Trademarks 12
Warranty 13
PRODUCT OVERVIEW 15
Accessories 16
Optional Display 16
Interchangeable Probe 16
Constant Output Probe 17
Transmitter Components 18
INSTALLATION 19
1011-161 20
0505-248 21
Duct Installation Kit 22
0505-177 23
0505-178 23
Probe Mounting Flange 24
Probe Mounting Clamp 25
Connections 26
10 ... 35 VDC 27
RS-485 Bus Termination 28
OPERATION 29
Property Value 30
0807-004 31
List of Serial Commands 32
Show Device Information 33
Set/Show Calibration Date 34
Show Analog Output Status 35
Serial Line Output Commands 36
Stop Continuous Outputting 37
Set/Show Output Interval 37
Output a Reading Once 37
Calibration Commands 38
Calibrate Analog Output 40
Set/Show Terminal Echo 41
Configuring Analog Output 43
Scaling 44
Examples: 45
Configuring Relay Output 46
Show Relay Settings 47
Other Commands 48
Set/Show Output Formatting 49
Display Command List 50
Display Active Errors 50
Save Changed Settings 50
Restore Saved Settings 51
Reset Transmitter 51
Restore Factory Settings 51
Set/Show Output Unit 52
Networking Commands 52
>sdelay 100 53
Turnaround time : 100 53
>CLOSE 55
MAINTENANCE 57
Fixed Probe Model 58
Remote Probe Model 59
Calibration and Adjustment 60
Adjustment with HM70 64
Reference Probe 65
0505-185 66
0505-186 66
LiCl-NaCl Adjustment 67
Calibrated Reference Probe 68
Adjustment with HMI41 69
Offset and Gain Adjustments 71
HOLD again 72
ENTER to conclude the 72
MODE. The following display 73
Troubleshooting 74
Analog Output Tests 75
TROUBLESHOOTING 77
Solving Typical Problems 78
Technical Support 79
TECHNICAL DATA 81
Table 12 Inputs and Outputs 82
Options and Accessories 83
Transmitter Dimensions 84
1011-159 85
CALCULATION FORMULAS 87
Dew/frostpoint Temperature 88
Mixing Ratio 89
Absolute Humidity 89
Enthalpy 89
Saturation Vapor Pressure 90
Water Vapor Pressure 91

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