Celestron CG-4 User Manual

INSTRUCTION MANUAL0345 200PYRGEOMETERmanualCustomer Support

GENERAL INFORMATION 9 Within this spectral range the earth is able to maintain an equilibrium temperature by losing a certain quantity of heat

GENERAL INFORMATION 10 Figure 1.3 Atmospheric radiation (atmospheric window 8 to 14 µm) Where as a pyranometer only receives

GENERAL INFORMATION 11 = Upward irradiance of the CG 4 sensor [W/m2] Note that the net radiation term (Uemf / S) is mostly negative, so th

GENERAL INFORMATION 12 • The thermistor contacts a part of the window, it is a blackbody radiator and heat source itself and its materi

GENERAL INFORMATION 13 1.4.1 How to perform the check? The check must be performed under clear sky conditions. The CG 4 pyrgeometer is opera

GENERAL INFORMATION 14CG 4 stabilises at < 3 W/m2. The experiment shows that for most practical purposes, CG 4 does not need compensation fo

GENERAL INFORMATION 15 Due to the thermopile construction and applied thermistor compensation circuit the temperature response is suppressed to

GENERAL INFORMATION 16

TECHNICAL DATA 17 2 TECHNICAL DATA 2.1 SPECIFICATIONS OF THE CG 4 PYRGEOMETER Performance Spectral range: 4.5 to 42 µm, 50% points. Se

TECHNICAL DATA 18 Estimated inaccuracy of measurement: < 7.5 W/m2. Thermistor specifications (only for thermistor version): Type YSI 44

IMPORTANT USER INFORMATION 1 IMPORTANT USER INFORMATION Reading this entire manual is recommended for full understanding of the use of this

TECHNICAL DATA 19 Figure 2.1 CG 4 pyrgeometer outline dimensions

TECHNICAL DATA 20 2.2 ACCURACY As listed in paragraph 2.1 the sensitivity is cross-correlated to a number of parameters such as temperature a

TECHNICAL DATA 21 The temperature dependence of the sensitivity is an individual function. For any given CG 4 the curve lies in the region betw

TECHNICAL DATA 22

INSTALLATION 23 3 INSTALLATION Reading these instructions before installation is recommended. 3.1 DELIVERY Check the contents of the shipm

INSTALLATION 24 3.2 MECHANICAL INSTALLATION The mechanical installation of the pyrgeometer must be carried out depending on the application. D

INSTALLATION 25 Note: After recalibration and/or reinstallation the nylon insulators must be replaced with new ones to maintain durability.

INSTALLATION 26 3.2.3 Levelling Accurate measurement of the downward atmospheric long wave radiation requires the proper levelling of the ther

INSTALLATION 27 Figure 3.2 Mounting of two pyrgeometers. The pyrgeometer must always be mounted with the cable gla

INSTALLATION 28 3.3 ELECTRICAL CONNECTION The CG 4 is provided with a 10 m, 6 wire shielded cable (8 wire for the Pt-100 version). The followi

IMPORTANT USER INFORMATION 2 DECLARATION OF CONFORMITY According to EC guideline 89/336/EEC 73/23/EEC We Kipp & Zonen B.V. Röntgen

INSTALLATION 29 Looking at the circuit diagram of figure 3.3, it is clear that the impedance of the readout equipment is loading the thermistor

INSTALLATION 30Kipp & Zonen supplies shielded low-noise extension cables up to lengths of 200 m which are coupled by waterproof connectors

INSTALLATION 31 Figure 3.5 Example of a CG 4 with a Pt-100 connected to a Campbell data logger For amplification of the p

INSTALLATION 32

OPERATION 33 4 OPERATION After completing the installation the pyrgeometer will be ready for operation. At the end of the paragraph an exampl

OPERATION 34 4.1.1 Example During field measurements the pyrgeometer is exposed to varying atmospheric conditions with typical radiating prop

OPERATION 35 4.1.3 Clear sky conditions Clear sky conditions differ in the way that there is a relative large heat loss caused by the atmosph

OPERATION 36on many parameters, for example the water vapour content in the atmosphere (Humidity), location of the CG 4 at a certain altitude a

OPERATION 37 4.2 MEASURING NET RADIATION WITH TWO PYRGEOMETERS With two CG 4’s as a net-pyrgeometer, the long wave radiation balance (also

OPERATION 38

TABLE OF CONTENTS 3 TABLE OF CONTENTS IMPORTANT USER INFORMATION ...1 DECLARATION OF CONF

MAINTENANCE 39 5 MAINTENANCE Once installed the pyrgeometer needs little maintenance. The Silicon window must be inspected at regular inte

MAINTENANCE 40 It is normal in humid areas to replace the desiccant twice a year. The exchange interval is affected by humidity, change in ai

CALIBRATION 41 6 CALIBRATION 6.1 THE CALIBRATION FACTOR The ideal pyrgeometer should always have a constant ratio of voltage output to irra

CALIBRATION 42 A final St is determined only from one minute St’s determined in periods with net IR-exchange = Ld – Tb481067.5 ⋅⋅−> 40 W/m²

FREQUENTLY ASKED QUESTIONS (FAQ’S) 43 7 FREQUENTLY ASKED QUESTIONS (FAQ’s) The most frequently asked questions are listed below. For an

FREQUENTLY ASKED QUESTIONS (FAQ’S) 44 normally the cable gland is never touched while the cartridge is removed frequently. So when no care is

TROUBLE SHOOTING 45 8 TROUBLE SHOOTING Any visible damage or malfunction should be reported to your dealer, who will suggest appropriate acti

TROUBLE SHOOTING 46

PART NUMBERS / SPARE PARTS / OPTIONS 47 9 PART NUMBERS / SPARE PARTS / OPTIONS Description Part no. Upper sunscreen (plastic) 0305-166

PART NUMBERS / SPARE PARTS / OPTIONS 48Description Part no. Mounting plate for 4 unventilated sensors (2 upper and 2 lower) 0012 092 10

TABLE OF CONTENTS 4 6.2 CALIBRATION PROCEDURE AT KIPP & ZONEN ... 41 6.2.1 The outdoor procedure...

APPENDIX I 49 APPENDIX I WORLD RADIATION CENTRE INFORMATION The World Radiation Centre capable of Pyrgeometer calibration is: Physikalis

APPENDIX I 50

APPENDIX II 51 APPENDIX II THERMISTOR SPECIFICATIONS YSI thermistor 44031 Resistance versus Temperature in °C Temperature [ °C ] Resistan

APPENDIX II 52

APPENDIX III 53 APPENDIX III Pt-100 SPECIFICATIONS Pt-100 Resistance versus Temperature in °C Temperature [ °C ] Resistance [ Ω ] Temperat

APPENDIX III 54

APPENDIX VI 55 APPENDIX IV RECALIBRATION SERVICE Pyranometers, UV-meters, Pyrgeometers & Sunshine duration sensors Kipp & Zonen s

APPENDIX VI 56

APPENDIX VI 57 NAME : COMPANY/INSTITUTE : ADDRESS : POSTCODE +CITY : COUNTRY : PHONE : FAX :  I would like to receive a price list for r

APPENDIX VI 58

GENERAL INFORMATION 5 1 GENERAL INFORMATION 1.1 INTRODUCTION Pyrgeometers are recommended by the BSRN (Baseline Surface Radiation Network)

APPENDIX VI 59 NAME : COMPANY/INSTITUTE : ADDRESS : POSTCODE +CITY : COUNTRY : PHONE : FAX :  I would like to receive a price list for rec

APPENDIX VI 60

APPENDIX VI 61 NAME : COMPANY/INSTITUTE : ADDRESS : POSTCODE +CITY : COUNTRY : PHONE : FAX :  I would like to receive a price list for r

APPENDIX VI 62

Holland Kipp & Zonen B.V. Röntgenweg 1 2624 BD DELFT T +31 15 269 8000 F +31 15 262 0351 E [email protected] Kipp & Zonen

GENERAL INFORMATION 6 1.2 PHYSICAL PRINCIPLES OF THE PYRGEOMETER The CG 4 pyrgeometer is provided with a thermal detector. The thermal detec

GENERAL INFORMATION 7 1.2.1 Properties of the Silicon window CG 4 uses a specially designed pure silicon window. Although the window isn’t h

GENERAL INFORMATION 8 Figure 1.2 Typical transmittance of a CG 4 window. 1.3 DOWNWARD ATMOSPHERIC LONG WAVE RADIATION Th