Vaisala HMW90 User Manual Page 17
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Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 15
Output Parameters Explained
Table 4 Parameters Supported by HMW90 Series
Parameter
Symbol
Unit(s)
Description
Temperature
T
°C
°F
Temperature in Celsius or
Fahrenheit scale.
Relative
humidity
RH
%
Ratio of the partial pressure of
water vapor in the air to the
saturation vapor pressure of air
at the current temperature.
Dewpoint
Td
°C
°F
Temperature at which the water
vapor in the air will condense into
water at the current pressure.
Dewpoint
Tdf
°C
°F
Same as Td, except when the
dewpoint is below 0 °C, the
transmitter outputs frostpoint (Tf)
instead of dewpoint.
Dewpoint
depression
dTd
°C
°F
Difference between ambient
temperature and dewpoint (Tdf).
Wet bulb
temperature
Tw
°C
°F
The minimum temperature that
can be reached by evaporative
cooling in the current conditions.
Absolute
humidity
a
g/m3
gr/ft3
Quantity of water in a cubic meter
(or cubic foot) of air.
Mixing ratio
x
g/kg
gr/lb
Ratio of water vapor mass per
kilogram (or pound) of dry air.
Enthalpy
h
kJ/kg
btu/lb
Sum of the internal energy of a
thermodynamic system.
NOTE
Humidity
parameters are not measured by TMW92, TMW93, and
TMW90
transmitters even though the parameters can be selected using
the service port (serial line and MI70 indic
ator use).
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 5 5
- CHAPTER 6 5
- CHAPTER 7 5
- APPENDIX A 5
- APPENDIX B 6
- List of Figures 7
- List of Tables 8
- GENERAL INFORMATION 9
- Version Information 10
- Related Manuals 10
- Documentation Conventions 10
- Recycling 11
- Regulatory Compliances 12
- Patent Notice 12
- Trademarks 12
- Software License 12
- Warranty 13
- PRODUCT OVERVIEW 15
- HMW90 Series Transmitters 16
- Output Parameters Explained 17
- Transmitter parts 18
- 1201-005 19
- 1201-006 20
- 1209-013 21
- INSTALLATION 23
- HMW92/TMW92 HMW93/TMW 24
- Relative Humidity (%) 26
- 1209-016 28
- 128 64 32 16 8 4 2 1 29
- Binary: 10100001 29
- Decimal: 161 29
- (128 + 32 + 1) 29
- Selecting Location 30
- Wiring HMW92 31
- Wiring HMW93 32
- -T -Vs+T +Vs 33
- CONTROLLER 34
- Wiring HMW95 35
- OPERATION 37
- Measurement Screen 38
- Service Port 39
- Connecting With a PC 40
- 0807-004 42
- List of Serial Commands 43
- Transmitter Information 44
- Show Transmitter Status 45
- >status 46
- Show Measured Parameters 47
- Show Command Help 47
- Measurement Settings 48
- Analog Output Settings 49
- Set Analog Output Scaling 50
- Display Settings 52
- Serial Line Output Commands 53
- Output a Reading Once 54
- Set Output Interval 54
- Set Output Format 55
- Serial Line Settings 56
- Set Relay Mode 57
- Relay Configuration Examples 59
- Adjust Humidity Measurement 60
- Show Current T Adjustment 62
- Information 63
- Testing Commands 64
- Other Commands 65
- Reset Transmitter 66
- Set BACnet Parameters 66
- MAINTENANCE 69
- Calibration and Adjustment 70
- CAUTION 71
- Adjustment Using an HM70 72
- Adjustment Using a PC 73
- Repair Maintenance 74
- 1112-028 75
- TROUBLESHOOTING 77
- Error Messages 78
- View Error Table 79
- Error State 80
- Switches 81
- Technical Support 83
- Product Returns 83
- TECHNICAL DATA 85
- Table 17 Mechanics 86
- Table 16 Inputs and Outputs 86
- Spare Parts and Accessories 87
- Dimensions in mm 88
- BACNET REFERENCE 89
- Device Object 92
- Object_Identifier 93
- Object_Name 93
- System_Status 93
- Relative Humidity object 94
- Reliability 95
- Temperature Object 96
- Calculated Humidity Objects 98
- Operation Pressure Object 100
- Present Value 100
- Status Flags 100
- Event State 100
- Out of Service 100
- Operation Altitude Object 101
- BIBBs Supported 102
- MODBUS REFERENCE 105
- Register Map 106
- Measurement Data (Read-Only) 107
- Status Registers (Read-Only) 108
- Configuration Registers 108
- Exception Responses 109
- *M211399EN* 110
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