INSTRUCTION MANUAL LP02 Pyranometer Revision: 1/14 C o p y r i g h t © 2 0 0 6 - 2 0 1 4 C a m p b e l l S c i e n t i f i c , I n c .
Warranty “PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless otherwise specified in the corresponding Campbell pricelist or product manual. Products not manufactured, but that are re-sold by Campbell, are warranted only to the limits extended by the original manufacturer.
Assistance Products may not be returned without prior authorization. The following contact information is for US and international customers residing in countries served by Campbell Scientific, Inc. directly. Affiliate companies handle repairs for customers within their territories. Please visit www.campbellsci.com to determine which Campbell Scientific company serves your country. To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 227-9000.
Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ................................................................. 1 2. Cautionary Statements ............................................... 1 3. Initial Inspection ......................................................... 1 3.1 3.2 Ships With ........................................................................................
Table of Contents 4-4. 4-5. 7-1. A-1. A-2. CM225 Bracket Mounting Holes ........................................................ 4 LP02 Pyranometer Attached to CM225 Solar Sensor Mounting Stand ................................................................................................ 4 LP02 Schematic ................................................................................. 10 CM245 bracket with 2.125 in. U-bolts positioned to mount the pyranometer horizontally on a crossarm ..................
LP02 Pyranometer 1. Introduction The LP02 is an ISO-second-class pyranometer that monitors solar radiation for the full solar spectrum range. It produces a millivolt signal that can be measured directly by a Campbell Scientific datalogger. The LP02 can provide solar radiation measurements for many meteorological applications. This pyranometer is manufactured by Hukseflux. Before using the LP02, please study: • • • 2. 3.
LP02 Pyranometer 4. Quickstart Please review Section 7, Operation, for wiring, CRBasic programming, and Edlog programming. 4.1 Siting Considerations The LP02 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. Site the LP02 to allow easy access for maintenance while ideally avoiding any obstructions above the plane of the sensing element.
LP02 Pyranometer FIGURE 4-2. CM225 Bracket Attached to a Mast 2. Place the LP02 in the center of the CM225 with the cable pointing to the nearest magnetic pole, and align the sensor’s mounting holes with two of the bracket’s mounting holes (see FIGURE 4-3 and FIGURE 4-4). Mounting Hole FIGURE 4-3.
LP02 Pyranometer Mounting Hole Mounting Hole Mounting Hole FIGURE 4-4. CM225 Bracket Mounting Holes 3. Place the mounting screws in the mounting holes and slightly tighten them. The leveling screws should lightly touch the mounting plate (see FIGURE 4-5). LP02 Pyranometer Bubble Level Cable Tie (3) Leveling Screws CM225 Solar Sensor Mounting Stand (2) Mounting Screws CM200 Series Crossarm FIGURE 4-5. LP02 Pyranometer Attached to CM225 Solar Sensor Mounting Stand 4.
LP02 Pyranometer 4.3 5. Tighten the mounting screws to secure the assembly in its final position. 6. Route the sensor cable to the instrument enclosure. 7. Use cable ties to secure the cable to CM225 bracket and to the vertical pipe or crossarm and tripod/tower (see FIGURE 4-5). Use SCWin to Program Datalogger and Generate Wiring Diagram The simplest method for programming the datalogger to measure the LP02 is to use Campbell Scientific’s SCWin Program Generator. 1.
LP02 Pyranometer 6 3. Select LP02 Pyranometer, and select the right arrow (in center of screen) to add it to the list of sensors to be measured, and then select Next. 4. Enter the Sensitivity supplied on the manufacturer’s certificate of calibration; this sensitivity is unique to each sensor. The public variables defaults can typically be used. After entering the information, click on OK, and then select Next.
LP02 Pyranometer 5. Choose the Outputs and then select Finish. 6. In the Save As window, enter an appropriate file name and select Save. 7. In the Confirm window, click Yes to download the program to the datalogger. 8. Click on Wiring Diagram and wire according to the wiring diagram generated by Short Cut.
LP02 Pyranometer 5. Overview The LP02 pyranometer is designed for continuous outdoor use. Due to its flat spectral sensitivity from 280 to 3000 nm, it can be used in natural sunlight, under plant canopies, in green houses or buildings, and inverted to measure reflected solar radiation. Two LP02s can be used in combination to measure albedo. The LP02 can also be used to measure most types of artificial light (Xenon lamps, Halogen lamps, etc.).
LP02 Pyranometer Compatible Dataloggers: CR800 CR850 CR1000 CR3000 CR9000(X) CR5000 CR23X CR10(X) CR510 CR500 21X CR7 Overall classification according to ISO 9060 / WMO: Second class pyranometer Response time for 95% response: 18 s Zero offset (response to 200 W m net thermal radiation): <15 W m–2 Zero offset (response to 5 K/h change in ambient temperature): <4 W m–2 Non-stability: <1% change per year Non-linearity: <±1% (100 to 1000 W m–2) Directional response for beam radiation: within ±25
LP02 Pyranometer 7. Operation 7.1 Wiring A schematic diagram of the LP02 is shown in FIGURE 7-1. White Green Clear FIGURE 7-1. LP02 Schematic When Short Cut is used to create the datalogger program, the sensor should be wired to the channels shown in the wiring diagram created by Short Cut. A differential voltage measurement is recommended because it has better noise rejection than a single-ended measurement. If a differential channel is not available, a single-ended measurement can be used.
LP02 Pyranometer TABLE 7-2. Single-Ended Connections to Campbell Scientific Dataloggers Color Description CR9000(X) CR5000 CR3000 CR1000 CR800 CR850 White Signal (+) Single-Ended Analog Green Signal (–) AG Clear Shield G 7.2 CR510 CR500 CR10(X) 21X CR7 CR23X Single-Ended Analog Single-Ended Analog Programming This section is for users who write their own datalogger programs. A datalogger program to measure this sensor can be created using Short Cut.
LP02 Pyranometer individual sensor and the maximum expected reading. With some dataloggers, an autorange option can be used if measurement time is not critical. The parameter code for the input range also specifies the measurement integration time. The slow or 60 Hz rejection integration gives a more noisefree reading. A fast integration takes less power and allows for faster throughput. 7.2.2 Multiplier The multiplier converts the millivolt reading to engineering units.
LP02 Pyranometer Wiring for the examples is given in TABLE 7-4. TABLE 7-4. Wiring for Example Programs Color Description CR1000 CR10X White Signal (+) DIFF Analog High DIFF Analog High Green Signal (–) *DIFF Analog Low *DIFF Analog Low Clear Shield * Jumper to AG or G with user supplied wire. 7.2.4.
LP02 Pyranometer 'Call Data Tables and Store Data CallTable(Table1) CallTable(Table2) NextScan EndProg 7.2.4.2 CR10X Example Program ;{CR10X} *Table 1 Program 01: 10.0000 Execution Interval (seconds) ; LP02 measurement in Wm-2 1: Volt (Diff) (P2) 1: 1 2: 23 3: 1 4: 3 5: 66.
LP02 Pyranometer 9: Average (P71) 1: 1 Reps 2: 3 Loc [ Solar_Wm2 ] 10: If time is (P92) 1: 0 Minutes (Seconds --) into a 2: 1440 Interval (same units as above) 3: 10 Set Output Flag High (Flag 0) 11: Set Active Storage Area (P80) 1: 1 Final Storage Area 1 2: 102 Array ID 12: Real Time (P77) 1: 1220 Year,Day,Hour/Minute (midnight = 2400) 13: Resolution (P78) 1: 1 High Resolution 14: Totalize (P72) 1: 1 Reps 2: 4 Loc [ Solar_MJ ] 15: Resolution (P78) 1: 0 Low Resolution 7.2.
LP02 Pyranometer 8. Maintenance Inspect and clean the outer dome at regular intervals, for example, every week or so. Clean any accumulated dust, etc. off the dome and pyranometer body using a soft cloth dampened with water or alcohol. Check that there is no condensation within the dome. It is also important to check the data returned from the sensor as it will show the first indication of a fault. Be aware of several expected phenomena that can cause strange measurements.
LP02 Pyranometer Symptom: sensor signal shows unexpected variations 1. Check for the presence of strong sources of electromagnetic radiation (radar, radio etc.) 2. Check the condition and the connection of the sensor shield wire. 3. Check the condition of the sensor cable.
LP02 Pyranometer 18
Appendix A. CM245 Adjustable Angle Mounting Stand A.1 Installation The CM245 includes slots that allow it to be adjusted to any angle from horizontal to vertical. If mounting the pyranometer at an angle, ensure that the crossarm is leveled horizontally before placing the bracket at its proper angle. Angle positions are included on the bracket label (see FIGURE A-1 and FIGURE A-2). Pyranometer mounts here First 2.125 in U-bolt Second 2.125 in U-bolt First 2.125 in U-bolt 90 Second 2.
Appendix A. CM245 Adjustable Angle Mounting Stand pn 17446 pn 4365 pn 4366 pn 27291 First 1.5 in U-bolt 40 Second 1.5 in U-bolt pn 17446 1.50 in FIGURE A-2. CM245 bracket with 1.5 in. U-bolts positioned to mount pyranometer at a 40° angle on a vertical pipe Do the following to level the pyranometer horizontally: 1. Attach the mounting stand to the crossarm. 2. Loosely mount the pyranometer on the mounting stand. Do not fully tighten the two mounting screws. 3.
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