Vaisala WAA151 Installation Manual Page 39
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Chapter 2 ___________________________________________________________Product Overview
VAISALA ________________________________________________________________________ 37
DRD11A
0105-018
Figure 21 DRD11A Rain Detector
Rain and snow are detected quickly and accurately with the DRD11A
Rain Detector. The DRD11A operates via droplet detection.
A special delay circuitry allows about two-minute interval between
raindrops before assuming an OFF (no rain) position. This enables the
sensor to accurately distinguish between rain cessation and light rain.
The DRD11A sensor is positioned at a 30° angle. This design,
together with the internal heating element, ensures that the surface
dries quickly, an essential factor in calculating intensity. The same
heating element also protects the surface from fog and condensed
moisture. In addition, the heating element is activated at low
temperatures in order to melt snow, thus allowing snow detection.
Sensor performance is not affected by reasonable amounts of dirt and
dust due to droplet detection.
Due to the heating power requirements, DRD11A is recommended to
be used only at stations equipped with AC power.
The DRD11A sensor set includes the sensor itself, cable, connector,
small signal conditioner card, and installation accessories for the
DKP12SUP1 sensor arm.
- INSTALLATION 1
- Table of Contents 3
- CHAPTER 3 5
- CHAPTER 4 5
- List of Figures 7
- List of Tables 9
- GENERAL INFORMATION 11
- ESD Protection 14
- Version Information 14
- Related Manuals 15
- Getting Help 15
- Warranty 16
- PRODUCT OVERVIEW 17
- MAWS301 18
- 0101-011 19
- Product Nomenclature 20
- MAWS Software 22
- Operating Software 22
- Lizard Setup Software 22
- MAWS Terminal 22
- BOX501 Enclosure 23
- 0202-001 24
- QML102 AWS Logger 25
- 0105-002 26
- Memory Expansion Board 27
- (Optional) 27
- Power Supplies 28
- Solar Panels 28
- 0105-005 29
- Backup Battery and Regulator 30
- AC Power Supply (Optional) 31
- Wind Sensors 32
- 0105-012 33
- 0105-013 34
- WAS425A/WAS425AH 35
- Air Temperature and Relative 36
- Humidity Sensor 36
- Pressure Sensor 36
- Precipitation Sensors 37
- 0105-017 38
- 0105-018 39
- Solar Radiation Sensors 40
- 0105-021 41
- 0105-022 42
- 0105-023 42
- 0105-024 43
- 0105-025 43
- Soil Temperature Sensors 44
- 0106-041 45
- Soil Moisture Sensor 46
- Water Level Sensors 46
- 0105-029 47
- 0202-003 48
- Leaf Wetness Sensor 49
- Fuel Moisture Sensor 50
- 0105-032 52
- 9608-041 53
- 0105-033 53
- Communication Devices 54
- Modem DMX501 55
- Satellite Transmitters 56
- 0105-036 57
- 0105-035 58
- 0202-004 58
- GSM Data Modem 59
- Optional Communication 60
- Equipment 60
- Accessories 60
- Surge Arrester 60
- Handheld Terminal 61
- GPS Time Synchronizing Unit 62
- Installation Accessories 62
- Support Arms 63
- Connector Adapters 64
- WHP25 Power Supply 65
- SELECTING LOCATION 67
- Precipitation 68
- Solar Radiation 69
- Soil Temperature 69
- Soil Moisture 69
- Water Level 70
- Placement of QMV101/QMV102 70
- Placement of DCU7110 71
- Snow Level 72
- Fuel Moisture 72
- Weather Sensor 72
- Installation Procedure 76
- Mounting the Sensor Arms 76
- 0202-008 77
- Installing Solar Panel 78
- Installing Sensors 80
- 9901-005 81
- 0202-009 83
- 0002-024 84
- Secondary 86
- 0105-059 86
- 0003-010 87
- 0003-013 89
- 0105-060 91
- 0105-061 92
- 0201-035 93
- 0002-010 93
- 0002-011 94
- 9901-011 95
- 0201-036 95
- 0201-037 96
- 9902-004 96
- 0105-062 97
- 9806-015 98
- 0201-040 100
- 0202-011 101
- 0105-067 101
- 0202-012 102
- 0105-069 103
- 9901-012 104
- 0106-039 105
- 0106-038 105
- 0106-042 106
- 0105-087 107
- 0105-088 108
- 0202-013 109
- 0202-010 111
- 0105-070 113
- 0105-071 113
- 0105-072 113
- 0201-041 115
- Smart Sensors 117
- Communication Modules 117
- 0105-055 118
- 0201-048 120
- 0201-049 121
- 0201-050 121
- 0202-014 122
- 0202-015 123
- 0202-016 124
- 0202-017 125
- 0202-018 126
- 0202-019 127
- 0202-020 128
- 0105-074 129
- 0105-075 129
- 0105-077 130
- 0105-078 130
- 0202-021 131
- 0202-022 132
- 0202-006 133
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