Vaisala FD12P Guía de usuario Pagina 25
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Chapter 2 ___________________________________________________________Product Overview
VAISALA ________________________________________________________________________ 25
The output data:
- Automatic or polled data message
- Visibility, present weather, precipitation and status data
- Automatic message type and interval is selectable at 15
seconds to n × 15 seconds (n < 18) intervals
The analog visibility output:
- Selectable range and mode (linear or logarithmic)
- Status control bit for remote alarm relay, etc.
- Alarms and warnings (hardware failures, visibility limits)
Optical Specifications
Operating principle:
- Forward scatter at an angle of 33
o
and capacitive rain sensor.
The light transmitter:
- Light source: near-infrared LED
- Peak wavelength: 875 nm
- Modulation frequency: 2.3 kHz
- Transmitter lens diameter: 71 mm
- Reference photodiode: for light source control
- Backscatter photodiode: for contamination and blockage
measurement
The light receiver:
- Photodiode: PIN 6 DI
- Spectral response: max. responsivity at 850 nm, 0.55 A/W
(in range 550 ... 1050 nm over 0.3 A/W)
- Reception lens diameter: 71 mm
- Backscatter light source: near-infrared LED for
contamination and blockage measurement
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 5 5
- CHAPTER 6 6
- List of Figures 7
- List of Tables 8
- GENERAL INFORMATION 11
- Version Information 12
- Related Manuals 12
- General Safety Considerations 12
- ESD Protection 15
- Trademarks 16
- Warranty 16
- PRODUCT OVERVIEW 17
- 0201-085 18
- Sensing Elements 19
- Electronics Enclosure 20
- Structural Elements 20
- Operating Principle 21
- Using FD12P 22
- Equipment Nomenclature 23
- Specifications 24
- Mechanical Specifications 24
- Electrical Specifications 24
- Optical Specifications 25
- Capabilities and Limitations 26
- Visibility Measurement 26
- Environmental Specifications 27
- INSTALLATION 29
- Location and Orientation 30
- 0110-178 31
- Equipment Grounding 32
- 0111-001 33
- Internal Grounding 34
- Grounding Remote Units and 34
- Communication Cable 34
- Cable Selection 35
- Line Power Cabling 35
- Unloading and Unpacking 36
- Unpacking Procedure 36
- Storage Information 36
- Installation Procedures 37
- Constructing the Foundation 37
- Mounting When Casting the Pad 38
- 0110-180 39
- Assembling the FD12P 40
- Sensor to the Mast 41
- 0201-088 42
- Connecting Cables 43
- 9509-011 44
- 0110-183 45
- 0110-184 46
- 0205-006 47
- Day/Night Switch to FD12P 48
- Luminance Meter 49
- Communication Options 50
- 9509-013 51
- Modem DMX21 52
- Originate Mode Answer Mode 53
- TXD 0 1 0 1 53
- CCITT 1180 980 1850 1650 53
- Analog Transmission 55
- Startup Testing 56
- Initial Settings 56
- OPERATION 59
- Markings Used in This Manual 61
- OPEN Command 61
- CLOSE Command 62
- Automatic Message Sending 62
- Message Types 63
- Message 0 64
- Message 1 64
- Message 2 65
- Message 3 65
- Message 4 66
- Messages 5 and 6 66
- Message 7 68
- Message Polling 69
- FD12P Command Set 70
- HELP Command 70
- MES Command 71
- AMES 1 60 ↵ 72
- AMES 0 0 ↵ 72
- Weather Related Commands 73
- PRW Command 77
- CLRS Command 78
- WHIS Command 78
- System Configuration Commands 79
- CONF Command 80
- CONF. PASSWORD (4 CHARS MAX) 81
- ANALOG OUTPUT RANGE 83
- MAX VISIBILITY ( 10000) 83
- MIN VISIBILITY ( 50) 83
- END OF CONFIGURATION 83
- BAUD Command 84
- BLSC Command 84
- Maintenance Commands 85
- CAL Command 87
- TCAL Command 87
- CLEAN Command 88
- CHEC Command 89
- FREQ Command 89
- DRY and WET Commands 89
- AN Command 90
- Analog Output Commands 91
- Data Scaling 92
- Hardware Check 92
- Other Commands 93
- RESET Command 94
- FUNCTIONAL DESCRIPTION 95
- Optical Measurement 96
- Optical Arrangement 96
- FDT12B Transmitter Unit 96
- 9611-002 97
- FDR12 Receiver Unit 98
- Additional Measurements 99
- DRD12 Rain Detector 100
- DTS14B Temperature Sensor 101
- FDP12 Control Unit 101
- 9611-004 102
- Measurement Signal Processing 103
- Optical Signal Processing 103
- DRD12 Signal Processing 104
- Visibility 105
- Algorithm Description 105
- Detecting Precipitation 106
- Precipitation Intensity 106
- Precipitation Accumulation 107
- Present Weather 108
- 0201-092 109
- Visibility Types 111
- Weather Classes 112
- Applications 113
- Internal Monitoring 114
- Built-in Tests 114
- Memory Tests 115
- Signal Monitoring 115
- Hardware Monitoring 115
- Contamination Monitoring 116
- MAINTENANCE 117
- Cleaning 118
- Cleaning Lenses and Hoods 118
- Cleaning DRD12 Rain Detector 118
- Calibration 119
- Visibility Calibration 119
- Calibration Check Procedure 120
- 0201-087 122
- Calibration Procedure 123
- 1 = Sensor holder 125
- 3 = Fixing screw 125
- Removing and Replacing 126
- 0110-187 127
- 0110-189 129
- Replacement 130
- TROUBLESHOOTING 133
- Message Missing 134
- Visibility Value is Missing 135
- There Is None 136
- FD12P Reports Frozen 136
- Precipitation during Rain 136
- Have Jumper Settings Been 137
- Changed? 137
- Getting Help 140
- Return Instructions 140
- NWS AND WMO CODES USED IN 143
- JUMPER SETTINGS AND INTERNAL 147
- CPU Board 149
- DC-Regulator 149
- DRI21 Interface Board 149
- TRANSMITTER AND RECEIVER TEST 151
- Table 42 Receiver Test Points 152
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