Vaisala BAROCAP PTB330 User's Guide download pdf (Page 129)

Appendix A ______________________________________________________ Calculation Formulas

VAISALA______________________________________________________________________ 127

APPENDIX A

CALCULATION FORMULAS

This appendix contains the calculation formulas used by the product.

Height compensated pressure values (QFE, QNH, and HCP) are

calculated using the following equations:

0706-109

where:

p = measured air pressure [hPa]

QFE

= height difference between the barometer and reference

level [m]

g = 9.81 [m/s2]

R = 287 [J/kg/K]

T = temperature [K]

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USER'S GUIDE 1
Table of Contents 3
CHAPTER 4 4
CHAPTER 5 6
CHAPTER 6 6
CHAPTER 7 6
APPENDIX A 7
APPENDIX B 7
APPENDIX C 7
List of Figures 9
List of Tables 11
GENERAL INFORMATION 13
General Safety Considerations 14
Feedback 14
ESD Protection 15
Recycling 16
Trademarks 16
License Agreement 16
Warranty 17
PRODUCT OVERVIEW 19
Pressure Measurement 20
0705-091 22
0508-019 24
0503-004 24
0503-006 26
Mounting Rain Shield with 28
Installation Kit 28
Panel Mounting Frame 29
Cable Bushings 30
0604-059 31
Alternate Wiring Systems 33
0703-019 34
M-12 (8-Pin) Connector 36
D-9 Connector 37
AC Power Supply Module 38
Installation 39
Warnings 40
Galvanic Isolation for Output 43
Analog Output Module 44
Relay Module (RELAY-1) 45
0503-037 47
Figure 26 4-Wire RS-485 Bus 50
Table 5 4-Wire (Switch 3:On) 50
Figure 27 2-Wire RS-485 Bus 51
OPERATION 53
Menus and Navigation 54
Reading 55
0708-035 56
0703-033 58
Display Settings 60
Rounding 61
Backlight 61
Contrast 61
Keypad Lock 61
Measuring Settings 62
Diagnostic Settings 62
Serial Interface Settings 63
System Settings 64
Factory Settings 65
Clearing Graph Displays 65
Relay Settings 66
Analog Output Settings 68
Serial Line Communication 70
User Port Connection 71
1 2 3 4 5 72
Service Port Connection 73
Terminal Program Settings 73
0507-028 74
0507-027 74
General Settings 78
Changing Quantities and Units 78
Measurement Related Commands 81
User Port Serial Settings 83
System Information Commands 85
Resetting barometer By Using 86
Serial Line 86
Locking Menu/Keypad by Using 87
Data Recording 88
Selecting Data Recording 88
Quantities 88
View Recorded Data 89
DELETE/UNDELETE 90
Operation of Relays 91
Quantity For Relay Output 91
Hysteresis 92
Enabling/Disabling Relays 94
Setting Relay Outputs 95
Testing Operation Of Relays 96
Operation of RS-485 Module 97
Networking Commands 97
>INTV 10 min 99
Output interval: 10 min 99
Operation of Analog Output 101
0705-211 102
0706-031 102
Analog Output Tests 104
Periodic Maintenance 105
Cleaning 105
Error States 105
0706-070 106
Pressure 109
Pressure Adjustment 111
Using Display/Keypad 116
Using Serial Line 116
Specifications 119
Performance 119
Operating Environment 120
Inputs and outputs 121
Mechanics 122
Technical Specifications of 122
Optional Modules 122
Table 26 Relay Module 123
Table 27 RS-485 Module 123
Options and Accessories 124
Dimensions (in mm) 125
Technical Support 125
Return Instructions 126
Vaisala Service Centers 127
CALCULATION FORMULAS 129
0706-110 130
0706-111 130
Min...Max 132
PA11A EMULATION MODE 135
PA11A Message Format 136

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Vaisala BAROCAP PTB330 User's Guide Page 129

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