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Summary of Contents for Campbell SR11
- Page 1 SR11 Pyranometer 6/17 C o p y r i g h t © 2 0 0 6 - 2 0 1 7 C a m p b e l l S c i e n t i f i c ,...
- Page 3 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...
- Page 5 PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...
- Page 7 • Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS...
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Page 9: Table Of Contents
Changing the Desiccant ..............9 7.1.3 Check Sensor Output ..............10 Recalibration ..................10 Troubleshooting ................. 10 Appendix A. Example Program ........... A-1 Figures 5-1. SR11 dimensions ................. 3 6-1. SR11 schematic ..................6 7-1. Desiccant indicator and holder ............10... - Page 10 Table of Contents Tables 6-1. Wire Colour, Function, and Datalogger Connection ......7 6-2. Multipliers Required for Flux Density and Total Fluxes ..... 8 CRBasic Example A-1. CR1000 Program Measuring the SR11 ........... A-1...
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Page 11: Introduction
• Although the SR11 is rugged, it is also a highly precise scientific instrument and should be handled as such. • Care should be taken when opening the shipping package to not damage or cut the cable jacket. -
Page 12: Overview
Two SR11s can be used in combination to measure albedo. The SR11 can also be used to measure most types of artificial light (Xenon lamps, Halogen lamps, etc.). -
Page 13: Sr11 Dimensions
Height (FIGURE 5-1): 9 cm (3.5 in) Body diameter (FIGURE 5-1): 13.6 cm (5.4 in) Weight with 5 m cable: 0.75 kg (01.65 lb) Guide to Meteorological Instruments and Methods of Observation, fifth edition, WMO, Geneva and ISO9060 FIGURE 5-1. SR11 dimensions... -
Page 14: Installation
Installation Siting Considerations The SR11 is usually installed horizontally, but can also be installed at any angle including an inverted position. In all cases, it will measure the flux that is incident on the surface that is parallel to the sensor surface. -
Page 15: Cm225 Mounting Procedure
U-bolt nuts. CM225 Stand CM200-Series Crossarm U-bolt Nuts 3. Loosely mount the pyranometer on the mounting stand. Do not fully tighten the two mounting screws. CM225 mounting holes used for the SR11 are indicated in orange. -
Page 16: Wiring
7. Route the sensor cable along the underside of the crossarm to the tripod/tower, and to the instrument enclosure. 8. Secure the cable to the crossarm and mast using cable ties Wiring A schematic diagram of the SR11 is shown in FIGURE 6-1. White Green Clear... -
Page 17: Programming
6.4.1 Input Range The output voltage of the SR11 is usually –0.1 to 50 mV per 1000 W m –2 When estimating the maximum likely value of sensor output, a maximum value of solar radiation of 1100 W m –2... -
Page 18: Multiplier
SR11 Pyranometer Select the input range as follows: 1. Estimate the maximum expected input voltage by multiplying the maximum expected irradiance (W m –2 ) by the calibration factor (µV/W m –2 ). Divide the answer by 1000 to give the maximum in millivolt units. -
Page 19: Maintenance And Troubleshooting
7.1.2 Changing the Desiccant A desiccant-filled drying cartridge prevents dew from forming on the inner sides of the domes; Campbell Scientific pn #27052 is the replacement desiccant for this cartridge. Replace the desiccant if the desiccant indicator is pink instead of blue (FIGURE 7-1). -
Page 20: Check Sensor Output
50% in the first hours after sunrise. Recalibration The calibration of the pyranometer may drift with time and exposure to radiation. Recalibration every two years is recommended. The sensor should be returned to Campbell Scientific for recalibration (see Assistance page). Troubleshooting Symptom: NAN, –9999, or radiation values around 0... - Page 21 Check the condition and the connection of the sensor shield wire. Check the condition of the sensor cable. Symptom: internal condensation on outer dome Replace desiccant (Section 7.1.2, Changing the Desiccant (p. 9) Symptom: internal condensation on inner dome Return to Campbell Scientific for a factory repair (see Assistance page).
- Page 22 SR11 Pyranometer...
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Page 23: Appendix A. Example Program
Appendix A. Example Program The following program measures the SR11 every 10 seconds and converts the mV output to W m –2 and MJ m –2 . A sensor calibration of 15.02 µV per W m –2 is used for the example programs. Both programs output an hourly average flux (W m –2... - Page 26 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...
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