Vaisala LT31 Manuals

Vaisala LT31 Manuals

Manuals and User Guides for Vaisala LT31. We have 1 Vaisala LT31 manual available for free PDF download: User Manual

Vaisala LT31 User Manual

Vaisala LT31 User Manual (294 pages)

Transmissometer

Brand: Vaisala | Category: Measuring Instruments | Size: 17.92 MB

Table of Contents

Table of Contents
3
Chapter 1 General Information

15
- About this Manual
  
  15
  - Contents of this Manual
    15
  - Version Information
    16
  - Related Manuals
    16
  - Feedback
    16
- Safety
  
  16
  - General Safety Considerations
    16
  - Table 1 Manual Revisions
    16
  - Table 2 Related Manuals
    16
  - Product Related Safety Precautions
    17
  - ESD Protection
    19
- Recycling
  
  20
- Regulatory Compliances
  
  21
- Patent Notice
  
  21
- Trademarks
  
  21
- Warranty
  
  21
Chapter 2 Product Overview

23
- Description and Purpose
  
  23
  - LT31 Key Features
    23
    
    Auto-Calibration
    23
    
    Range Extension
    23
    
    Alignment Quality Control
    24
    
    Auto-Alignment
    24
    
    Contamination Prevention
    24
    
    Double-Mast Construction
    24
    
    LED Light Source
    24
    
    Self-Diagnostics
    24
    
    Window Contamination Measurement
    24
    
    Compatibility
    25
- Introduction to LT31
  
  25
  - Figure 1 Vaisala Transmissometer LT31
    26
    
    Figure 2 Receiver Unit LTR111 with LM21 Background Luminance
    27
    
    Figure 3 Transmitter Unit LTT111 with PWD Forward Scatter Sensor
    28
    
    Figure 4 Measurement Head
    29
    
    Mast with Support Unit
    30
    
    Figure 5 Support Unit
    31
    
    Figure 6 Measurement Unit
    32
    
    Measurement Unit
    32
    
    Figure 7 Measurement Unit Opened
    33
    
    Figure 8 Interface Unit
    34
    
    Interface Unit
    34
- Equipment Nomenclature
  
  35
Chapter 3 Functional Description

39
- Operating Principles
  
  39
Chapter 4 Installation

67
Chapter 5 Operation

145
- LT31 Commands
  
  145
  - Entering and Exiting Command Mode
    145
    
    OPEN Command
    145
    
    CLOSE Command
    147
  - Available Commands
    147
    
    Command Completion
    147
    
    Table 10 User Level Commands
    148
    
    Table 11 Advanced Level Commands
    150
  - Terminal Line Adjustment
    153
  - Command Polling
    153
    
    CRC16 Checksum
    155
- Menu-Driven Operation
  
  156
  - Figure 102 Main Menu
    156
    
    Configuration
    157
    
    Figure 103 Configuration Menu
    157
    
    Submenus
    157
    
    Figure 104 Configuration Menu: Data Port Speed
    158
    
    Figure 105 Configuration Message Interval
    158
    
    Free-Form Input
    158
    
    Item List
    158
    
    System Status
    158
    
    Alignment
    159
    
    Calibration
    159
    
    Figure 106 Status Menu
    159
    
    Linearity Test
    159
    
    Simulation
    159
    
    Events
    160
    
    Figure 107 Event Log
    160
    
    PWD Sensor
    160
    
    Service
    160
    
    Figure 108 Event Log: Reduced List
    161
    
    Message Formats
    161
    
    Table 12 Event Log Entry
    161
    
    Message 1 - LT31 Standard Message
    162
    
    MESSAGE Command
    162
    
    LT31 System
    164
    
    Status Codes
    164
    
    Table 13 Status Codes
    164
    
    Table 14 LT31 Overall Status (Byte Number 21)
    164
    
    Table 15 LT31 MOR Status (Byte Number 22)
    165
    
    Table 16 LT31 Power Supply (Byte Number 23)
    166
    
    Table 17 LT31 Auto-Calibration (Byte Number 24)
    166
    
    Table 18 LT31 Window Contamination (Byte Number 25)
    166
    
    Table 19 LT31 Alignment (Byte Number 26)
    167
    
    Table 20 LT31 Future Extension 1 (Byte Number 27)
    167
    
    Table 21 LT31 Future Extension 2 (Byte Number 28)
    167
    
    Table 22 LT31 Transmitter Status (Byte Number 29)
    168
    
    Table 23 LT31 Transmitter: Main Transmitter Module (Byte Number 30)
    168
    
    Table 24 LT31 Transmitter: Window Transmitter Module (Byte Number 31)
    169
    
    Table 25 LT31 Transmitter: Measurement CPU (Byte Number 32)
    169
    
    Table 26 LT31 Transmitter: Miscellaneous (Byte Number 33)
    170
    
    Table 27 LT31 Receiver Status (Byte Number 34)
    170
    
    Table 28 LT31 Receiver: Master CPU Status (Byte Number 35)
    170
    
    Table 29 LT31 Receiver: Main Receiver Module (Byte Number 36)
    171
    
    Table 30 LT31 Receiver: Window Transmitter Module (Byte Number 37)
    171
    
    Table 31 LT31 Receiver: Measurement CPU (Byte Number 38)
    172
    
    Table 32 LT31 Receiver: Miscellaneous (Byte Number 39)
    172
    
    Table 33 LT31 PWD Status (Byte Number 40)
    173
    
    Table 34 Background Luminance Sensor LM21 (Optional) Alarm Status Information (Byte Number 54)
    173
    
    Message 2 - LT31 Message Including PW Data (Optional)
    174
    
    Message 3 - Status Message
    175
    
    Message 4 - Vaisala System Standard Message
    176
    
    Message 5 - FD12 Message 2
    177
    
    Message 5 and 6 - FD12 Emulation
    177
    
    Message 6 - FD12 Message 7
    178
    
    Message 7 - MITRAS Emulation
    179
    
    Message 8 - Flamingo Emulation
    180
    
    Automatic Mode
    181
    
    Message 9 - Service Raw Values
    181
    
    Message Sending Modes
    181
    
    Polled Mode
    182
    
    METAR Messaging
    183
    
    System Configuration
    184
    
    Default Factory Settings
    185
    
    Background Luminance Sensor LM21
    186
    
    External Sensors (Optional)
    186
    
    RVR System Test Commands
    186
    
    Table 35 Default Factory Parameter Settings
    186
    
    Fixed Test Messages
    187
    
    Message 1
    187
    
    Message 2
    187
    
    Message 4
    187
    
    Message 5 - FD12 Message 2 Emulation
    187
    
    Manual Simulation Message
    188
    
    Message 6 - FD12 Message 7 Emulation
    188
    
    Message 7 - MITRAS Emulation
    188
    
    Message 8 - SKOPOGRAPH II Flamingo
    188
    
    Figure 109 Simulation Menu
    189
    
    Simulation Sequences
    189
    
    Figure 110 Summary of Sequence Data
    190
    
    Message 1
    191
    
    Message 2
    191
    
    Message 4
    191
    
    Message 7 (MITRAS)
    191
    
    Message 8 (SKOPO 2)
    191
Chapter 6 Maintenance

193
- Periodic Maintenance
  193
  - Cleaning Instructions
    194
  - Cleaning LT31 Windows and Weather Protection Hoods
    194
  - Figure 111 LT31 Windows
    194
  - Cleaning PWD Forward Scatter Sensor
    195
    
    Cleaning Lenses and Hoods
    195
    
    Figure 112 PWD Hardware Structure
    195
    
    Figure 113 PWD Sensor Lenses
    196
    
    Cleaning RAINCAP
    197
    
    Cleaning Window of Optional LM21
    197
  - Inspection and Cleaning Winter Dirt
    198
  - Blower System
    198
    
    Checking Operation
    199
    
    Replacing Particle Filter
    199
  - Optional Heated Weather Protection Hoods
    200
    
    Figure 114 Particle Filter Holder
    200
    
    Figure 115 Particle Filter
    200
    
    Checking Operation
    201
- Repair Instructions
  
  201
- Alignment
  
  225
  - Figure 128 Alignment Menu
    225
    
    Raw and Fine Alignment
    226
    
    Figure 129 Moving the Axes to MID-Position
    227
    
    Figure 130 Scanning Axes During Raw and Fine Alignment
    230
    
    Fine Alignment
    231
- Calibration
  
  232
  - Figure 131 Scanning Axes During Fine Alignment
    232
    
    Calibration Menu
    233
    
    Figure 132 Calibration Menu
    233
    
    Offset and Visibility Calibration
    234
    
    Figure 133 Optical Blocker Mounted on Receiver Support Unit
    235
    
    Figure 134 Offset Calibration
    236
    
    Figure 135 Visibility Calibration
    237
    
    Figure 136 Choosing MOR Reading
    238
    
    Visibility Calibration
    238
    
    Figure 137 Visibility Calibration
    239
    
    Figure 138 Choosing MOR Reading
    239
    
    Command Line Calibration
    240
    
    Visibility Calibration
    240
- PWD Sensor
  
  241
  - CLEAN Command
    241
  - Figure 139 PWD Sensor Menu
    241
  - ZERO Command
    242
  - Figure 140 PWD Sensor Menu, CLEAN Command
    242
  - CAL Command
    243
  - CHEC Command
    243
  - Other Commands
    244
  - Spare Unit Init
    244
  - Full Command Set Access
    244
- Linearity Test
  
  245
- Service Menu
  
  250
  - Figure 145 Linearity Test Menu, Reference Update
    250
    
    Blow
    251
    
    Displayed Values
    251
    
    Figure 146 Service Menu on User Command Level
    251
    
    Figure 147 Service Menu on Advanced Command Level
    251
    
    Transmitter/Receiver Measurement Unit
    251
    
    Beep
    252
    
    Freq (Advanced Command Level Only)
    252
    
    Heat
    252
    
    Mrdc (Receiver Only) (Advanced Command Level Only)
    252
    
    Mtdera (Transmitter Only) (Advanced Command Level Only)
    252
    
    Mtint (Transmitter Only) (Advanced Command Level Only)
    252
    
    Status
    252
    
    Wrdc (Advanced Command Level Only)
    252
    
    Wtint (Advanced Command Level Only)
    252
    
    Bgl
    253
    
    Hor (Advanced Command Level Only)
    253
    
    LM Sensor
    253
    
    Mrac (Receiver Only) (Advanced Command Level Only)
    253
    
    PWD Sensor
    253
    
    Ver (Advanced Command Level Only)
    253
    
    Visi
    253
    
    Wmo1Min
    253
    
    Wrac (Advanced Command Level Only)
    253
    
    Wtdera (Advanced Command Level Only)
    253
    
    Blower
    254
    
    Commands
    254
    
    Beeper
    255
    
    Figure 148 Switching off Receiver Unit/Blower
    255
    
    Heater
    255
    
    Frequency (Advanced Command Level Only)
    256
    
    Figure 149 Decreasing Main Transmitter Modulation Frequency
    257
    
    Figure 150 Setting Main Transmitter Modulation Frequency to 994 Hz
    257
    
    Movement (Advanced Command Level Only)
    258
    
    Scanning (Advanced Command Level Only)
    259
    
    Figure 151 Setting Main Receiver Response Time to Fast
    260
    
    Receiver Response Time (Advanced Command Level Only)
    260
Chapter 7 Troubleshooting

261
- Status Messages
  261
- Table 36 Events
  262
- Miscellaneous Problems
  273
- Table 37 Miscellaneous Problems
  273
- Technical Support
  275
- Return Instructions
  276
Chapter 8 Technical Data

277
Appendix Aoptions Installation

281
- Extension Poles Installation
  281
Index

291

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