Vaisala LT31 User Manual

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VAISALA ________________________________________________________________________ 9
List of Figures
Figure 1 Vaisala Transmissometer LT31 ............................................... 26
Figure 2 Receiver Unit LTR111 with LM21 Background Luminance
Sensor ...................................................................................... 27
Figure 3 Transmitter Unit LTT111 with PWD Forward Scatter Sensor .. 28
Figure 4 Measurement Head.................................................................. 29
Figure 5 Support Unit .............................................................................31
Figure 6 Measurement Unit....................................................................32
Figure 7 Measurement Unit Opened ...................................................... 33
Figure 8 Interface Unit ............................................................................ 34
Figure 9 Alignment Mechanism.............................................................. 43
Figure 10 Window Contamination Prevention Principle ........................... 44
Figure 11 Window Contamination Measurement Principle ...................... 45
Figure 12 Communication Principle.......................................................... 46
Figure 13 Measurement Unit....................................................................47
Figure 14 Optics Unit Transmitter LTO112 ..............................................48
Figure 15 Optics Unit Receiver LTO212 .................................................. 49
Figure 16 Main Transmitter Module LTL112 ............................................ 49
Figure 17 Block Diagram LTL112.............................................................50
Figure 18 Main Receiver Module LTD112................................................ 51
Figure 19 Block Diagram LTD112 ............................................................ 52
Figure 20 Window Transmitter Module LTL212 ....................................... 52
Figure 21 Block Diagram LTL212.............................................................53
Figure 22 Measurement Head CPU LTC112 ........................................... 53
Figure 23 Block Diagram LTC112 ............................................................ 55
Figure 24 Interface Unit Receiver LTI211 ................................................ 56
Figure 25 Power Supply FSP102 ............................................................. 57
Figure 26 Master CPU LTC212................................................................ 58
Figure 27 PWD Forward Scatter Sensor.................................................. 59
Figure 28 Installed Background Luminance Sensor LM21 ...................... 61
Figure 29 Installed Obstruction Light LT31OBS....................................... 63
Figure 30 Installed Battery Charger Module QBR101.............................. 64
Figure 31 Installed Backup Battery........................................................... 65
Figure 32 LT31 Equipment Grounding ..................................................... 73
Figure 33 TERMBOX-1200/Junction Box for Receiver ............................ 75
Figure 34 TERMBOX-9000/Junction Box for Transmitter ........................ 75
Figure 35 Cable Grounding Instruction .................................................... 77
Figure 36 RS-232 Communication Option ............................................... 79
Figure 37 RS-485 Communication Option ............................................... 80
Figure 38 RS-485 Option.......................................................................... 81
Figure 39 Modem Wiring .......................................................................... 82
Figure 40 AC and Battery Backup Switch ................................................ 83
Figure 41 Installing DMX501 .................................................................... 84
Figure 42 Casting Concrete Foundation .................................................. 86
Figure 43 Positioning Drilling Holes.......................................................... 88
Figure 44 Foundation Screws................................................................... 89
Figure 45 LT31 Foundation Construction................................................. 91
Figure 46 Receiver Installation Parts........................................................ 93
Figure 47 Foundation Screws................................................................... 94
Figure 48 Vertical Mast Alignment............................................................ 94
Figure 49 Tightening Nuts ........................................................................ 95
Figure 50 Mounting Weather Protection Hood ......................................... 96
Figure 51 Cable Routing for Optional Heated Hood................................. 96
Figure 52 Fastening Screws of Support Unit............................................ 97
Figure 53 Aligning with Sight Hole............................................................ 98
Figure 54 LT31 with LM21 Option Installed.............................................. 99

Vaisala LT31 Specifications

General

Brand	Vaisala
Model	LT31
Category	Measuring Instruments
Language	English