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CT25K
Vaisala CT25K User Manual
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© Vaisala 1999
No part of this manual may
be
reproduced in any form
or b
y
any means,
electronic or mechani
cal (including photocopying), nor ma
y
its conten
ts be
communicated to a thi
rd party without prior written permission of
the
cop
y
right holder.
The contents of inst
ruction manuals are subject to ch
ange without
prior
notice.
1
3
Table of Contents
Default Chapter
3
Table of Contents
3
List of Figures
6
Introduction to Manual
9
Validity of this Manual
10
Safety Summary
11
1 General Information
15
Product Overview
15
Figure 1-1 Ceilometer CT25K
16
Specifications
17
Mechanical
17
External Connector J1 - Window Conditioner
17
External Connector J2 - Power Input
17
Output Interface
18
External Connector J3 - Data Line
18
Figure 1-2 Data Line Connection Options
19
External Connector J4 - Maintenance Line
20
Modem Options
20
Modem Board DMX55
20
Modem Board DMX50
21
Anet™ Interface DMX611
21
Transmitter
22
Receiver
22
Optical System
23
Performance
23
Environmental Conditions
23
2 Installation
24
Unloading and Unpacking
24
Figure 2-1 Measurement Unit Handle
24
Foundation
25
Figure 2-2 Foundation Construction
25
Assembling the Unit
26
Figure 2-3 Mounting the Pedestal
26
Figure 2-4 Attaching the Measurement Unit and the Shield
27
Using the Tilt Feature
28
Cable Connections
29
Figure 2-5 External Connectors (Bottom View)
29
Grounding
30
Figure 2-6 Termination Box Wire Connections
30
Connection of Maintenance Terminal
31
3 Start up
33
Start up Procedure
33
Figure 3-1 CT25K Switches and Leds
34
Mobile Operation Aspects
35
Verification of Proper Operation
35
Settings for Normal Operation
36
Factory Settings of User Programmable Parameters
36
4 Operation
39
Operation Modes
39
Serial Lines. Open and Closed Port
39
Figure 4-1 Operation Modes
39
Figure 4-2 Open and Closed Port
40
User Commands
41
Data Messages
47
Data Message No. 1
47
Data Message No. 2
50
Data Message No. 3
52
Data Message No. 4
53
Data Message No. 5
53
Data Message No. 6
53
Data Message No. 7
54
Spare)
55
DMX611 Operation (Option)
55
Status Message "S
56
Manual Message
59
Polling Mode
59
Prevailing Parameter Settings
60
Manual Angle Setting
61
5 Functional Description
63
Theory of Operation
63
Figure 5-1 Typical Measurement Signal
63
Technical Description
67
General
67
Figure 5-2 Measurement Unit Components
67
Figure 5-3 Subassembly Interconnections
68
LIDAR Measurement
69
Figure 5-4 Block Diagram of Operational Units
70
Internal Monitoring and Control
72
Module Descriptions
72
Optical Subassembly CTB22
72
Figure 5-5 Optical Subassembly CTB22 with Optics Monitor, Transmitter and Receiver Subassemblies
72
Laser Transmitter CTT21
73
Figure 5-6 CTT21 Block Diagram
73
Receiver CTR21
74
Figure 5-7 CTR21 Block Diagram
74
Optics Monitor CTL21
75
Figure 5-8 CTL21 Block Diagram
75
Board Frame DMF51
76
Figure 5-9 DMF51 Frame
76
Processor Board DMC50B
77
Figure 5-10 DMC50B Block Diagram
77
Figure 5-11 DIP Switch Settings of the DMC50
80
DC Converter DPS52
81
Figure 5-12 DPS52 Block Diagram
81
Ceilometer Interface Board DCT51
83
Figure 5-13 DCT51 Block Diagram
83
Line and Power Interface Subassembly CTP241
84
Figure 5-14 CTP241 Wiring
85
Internal Heaters Subassembly CT25039
86
Figure 5-15 CT25039 Wiring Diagram
86
Tilt Angle Sensor CT3675
87
Figure 5-16 CT3675 Tilt Angle Sensor
87
Window Conditioner CT2614 / CT2688
88
Figure 5-17 Window Conditioner CT2614/CT2688
88
Maintenance Terminal PSION3 (Option)
89
Figure 5-18 RS Cable
89
Modem DMX55 (Option)
90
Figure 5-19 DMX55 Block Diagram
90
Modem DMX50 (Option)
92
Figure 5-20 DMX50 Block Diagram
92
DMX611 Anet™ Interface (Option)
94
Figure 5-21 DMX611 Block Diagram
94
Sky Condition Algorithm
97
General
97
Option Code
97
Activation
97
Algorithm Overview
98
6 Periodic Maintenance
101
Alarms and Warnings
101
Window Cleaning
101
Battery Check
102
Storage
102
7 Troubleshooting
103
Normal Operation
103
Equipment
103
Instructions
103
Troubleshooting
107
Warnings
107
Alarms
110
Miscellaneous
111
Failure Diagnosis
112
8 Repair
113
General
113
Writing Conventions Used
113
Start-Up Procedure for Replacement (All Parts)
114
Transmitter CTT21
115
Removal
115
Figure 8-1 Board Connectors of the DMF51 Board Frame
115
Replacement
116
Figure 8-2 Removing the Laser Transmitter
116
Compensation Adjustments
119
Figure 8-3 Adjusting the Compensation
120
Figure 8-4 Adjusting the Compensation
121
Receiver CTR21
122
Removal
122
Replacement
123
Figure 8-5 Removing the Receiver
123
Coaxial Cable Replacement
125
Removal
125
Replacement
126
Compensation Fiber
127
Compensation Fiber Replacement
127
Optics Monitor CTL21
128
Removal
128
Replacement
129
Figure 8-6 Removing the Optics Monitor
129
Boards of Board Frame DMF51
130
Removing Boards
130
Figure 8-7 Boards of the DMF51 Board Frame
130
Replacing Boards
131
Parameter Settings of Ceilometer Interface Board DCT51
131
Line & Power Subassembly CTP241
131
Removal
131
Replacement
133
Figure 8-8 Removing Line and Power Interface Subassembly CTP241
133
Internal Heater Subassembly CT25039 Replacement
134
Battery 4592 Replacement Instructions
135
Figure 8-9 Internal Heater Replacement
135
Figure 8-10 Battery Replacement
136
Index
137
4
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Vaisala CT25K Specifications
General
Brand
Vaisala
Model
CT25K
Category
Measuring Instruments
Language
English
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