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CM 121 BC
User Manual
27 pgs794.56 Kb0

Kipp&Zonen CM 121 BC User Manual

CM 121
Shadow Ring
Instruction Manual
IMPORTANT USER INFORMATION
IMPORTANT USER INFORMATION
Reading this entire manual is recommended for full understanding of the use of this product.
Should you have any comments on this manual we will be pleased to receive them at: Kipp & Zonen B.V. Delftechpark 36 2628 XH Delft Holland P.O. Box 507 2600 AM Delft Holland Phone +31 (0)15 2755210 Fax +31 (0)15 2620351 Email info@kippzonen.com Web www.kippzonen.com
Kipp & Zonen reserve the right to make changes to the specifications without prior notice.
Kipp & Zonen guarantees that the product delivered has been thoroughly tested to ensure that it meets its published specifications. The warranty included in the conditions of delivery is valid only if the product has been installed and used according to the instructions supplied by Kipp & Zonen.
Kipp & Zonen shall in no event be liable for incidental or consequential damages, including without limitation, lost profits, loss of income, loss of use and other related exposures, however caused, arising from the faulty and incorrect use of the product.
COPYRIGHT© 2004 KIPP & ZONEN
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, without permission in written form from the company.
WARRANTY AND LIABILITY
Manual version: 0706
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IMPORTANT USER INFORMATION
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TABLE OF CONTENT
TABLE OF CONTENT
IMPORTANT USER INFORMATION.............................................................................................1
TABLE OF CONTENT...................................................................................................................3
1. INTRODUCTION........................................................................................................................5
2. UNPACKING AND ASSEMBLING............................................................................................7
2.1 CM 121B ..............................................................................................................................7
2.2 CM 121C..............................................................................................................................9
3. PRINCIPLES & SPECIFICATIONS........................................................................................11
3.1 Theory ................................................................................................................................11
3.2 Construction .......................................................................................................................12
3.3 Specifications .....................................................................................................................12
4. MOUNTING AND ALIGNMENT..............................................................................................14
4.1 Introduction.........................................................................................................................14
4.2 North-south alignment (one time installation).....................................................................14
4.3 Tilting of the sliding bars (one time installation)..................................................................17
4.4 Setting of the shadow ring sliding bars (regular servicing procedure)................................18
5. MEASUREMENT OF THE DIFFUSE SKY RADIATION........................................................19
5.1. The shadow ring correction...............................................................................................19
5.3 Diffuse sky radiation on a tilted plane.................................................................................21
6. APPENDIX..............................................................................................................................23
6.1 Theoretical derivation of the correction factor, for uniform sky radiation............................23
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TABLE OF CONTENT
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1. INTRODUCTION
1. INTRODUCTION
The combination of a CM 121 shadow ring and a pyranometer offers a simple solution for the measurement of the diffuse solar radiation.
Specific advantages of this type of shadowing are that it is suitable for installation anywhere on earth (contrary to designs that require the specification of a particular latitude), that it can be combi­ned with a ventilation unit, and that it has a special U-profile ring which simplifies the mathematical correction for intercepted diffuse radiation.
The shadow ring will keep the pyranometer in the shade during the entire day, preventing the direct solar radiation to reach the sensor. As a result only the diffuse solar radiation is measured. A regular schedule of maintenance would require manual adjustment of the sliding bars (that are connected to the actual shadow ring) every two days. This adjustment is necessary because the elevation of the solar course changes slightly from day to day. For proper setting of the sliding bars, the table of “correction factors and the sliding bar setting” can be consulted.
The CM 121 can be installed everywhere on earth. Normally the pyranometer will be in the horizontal position, alternatively it can be mounted in tilted positions along the north-south axis.
The ring itself is equipped with a special U-profile so that it has a nearly constant view angle during the year. A stable stand is guaranteed even at high winds.
Naturally, the shadow ring intercepts also a proportion of the diffuse sky radiation. A correction factor for this effect is recommended to be used as a refinement of the measurement. A table of correction factors is combined with the table for sliding bar setting.
The CM 121 can be used with Kipp & Zonen pyranometers. Typical use is with CM 11, CM 6B or CM 21. Pyranometer CM 3, although not recommended, can be fitted using the additional levelling fixture type CLF 1 for mounting on CM 121. Use with SP-Lite is not recommended because of spectral and cosine errors.
There are two types CM 121: The CM 121B is for use without a ventilation unit. The CM 121C is for using in combination with the ventilation unit CV 2. For mounting instructions see chapter 2.2. With the exception of chapter 2 all other instructions apply to both CM 121B and CM 121C.
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1. INTRODUCTION
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2. UNPACKING AND ASSEMBLING
2. UNPACKING AND ASSEMBLING
2.1 CM 121B
Packed in the CM 121B transport box are separate items:
z Base with crossbar, pyranometer support and sector with sight z The pillar with thread and 1 nut z Shadow ring z Sliding bars with 1 screw each for mounting the sliding bars on the shadow ring z Two bolts for mounting the pyranometer on the sector z This manual z A socket head wrench
After removing the ties with which the items are connected to the transport box, the shadow ring can easily be assembled.
z Place the pillar in between the base and the crossbar, using the thread z Place the shadow ring on its sliding bars using two screws z Insert the sliding bars in the crossbar. The correct way is when the pyranometer
sensor can be positioned along the axis of the ring
Caution: Please note that the screw that connects the pyranometer support with the crossbar
must never be touched because it defines the position of the pyranometer sector relative to the sliding bars and the shadow ring. The sector must be in the center of the ring and this is adjusted in the factory. The particular screw is protected by a cap.
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2. UNPACKING AND ASSEMBLING
figure 1. the different parts of the shadow ring CM 121B
1 sector (including sight) 2 scale on the sliding bar (point of readout is indicated) 3 crossbar 4 securing bolt for the crossbar to the pyranometer support 5 shadow ring 6 pyranometer (normally not included in delivery) 7 spirit level of the pyranometer 8 pyranometer support 9 screws for attachment of the sliding bar to the shadow ring 10 fixing screws for the sliding bars 11 sliding bar 12 pillar 13 base 14 leveling screw for the base
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