Silicon Pyranometer Smart Sensor (Part # S-LIB-M003)
Contents
1. 1 Measurement Averaging Option Yes Cable Length Available 3 0 m 9 8 ft Length of Smart Sensor Network Cable 3 0 m 9 8 ft Part Number S LIB M003 CE The CE Marking identifies this product as complying with all relevant directives in the European Union EU A single HOBO Weather Station can accommodate 15 data channels and up to 100 m 328 ft of smart sensor cable the digital communications portion of the sensor cables 2001 2010 Onset Computer Corporation Onset and HOBO are trademarks of Onset Computer Corporation Part MAN S LIB Doc 6708 D Silicon Pyranometer Smart Sensor Mounting Accessories e Light Sensor Mounting Bracket Part M LBB e Light Sensor Level Part M LLA Bracket Mounting It is recommended that you mount the Silicon Pyranometer smart sensor with the light sensor bracket on a pole or tripod see Figure 1 To mount the sensor using the bracket 1 Attach the light sensor bracket to a 1 inch to 1 s inch pole with the provided U bolts Note The bracket can also be mounted on a flat vertical surface using four screws 2 Position the Silicon Pyranometer sensor on top of the bracket with its cable running through the slot in the bracket 3 Using the two screws supplied attach the sensor to the bracket through the two holes on either side of the slot Note Do not completely tighten the screws until you level the sensor 4 Position the bracket so i2. 56 9 16 inch hole in the middle of the plate then drill two 25 holes 1 063 1 1 16 inches apart on either side of the center hole Cut a 0 31 5 16 inch wide slot in the mounting plate See Figure 3 The plate should be a thickness of 1 8 inch or less 2 Slide the sensor through the 0 31 5 16 inch wide slot 3 Attach the sensor using two 6 32 x 3 8 inch screws and lock washers not included 4 Shim the sensor as necessary to level it 2X 25 DRILL THRU Me 56 Z aan 1 063 Oe A f Figure 3 Recommended Mounting Plate Dimensions Page 3 of 6 Silicon Pyranometer Smart Sensor Mounting Considerations e Small errors in alignment can produce significant errors Be certain the sensor is mounted level e Mount the sensor where it will not be in a shadow Any obstruction should be below the plane of the sensor head If that is not possible try to limit obstructions to below 5 degrees where the effect will be minimal e If possible avoid placing the sensors in dusty locations Dust pollen and salt residue that collect on the top of the sensor can significantly degrade accuracy e Refer to the HOBO Weather Station User s Guide for more information about setting up complete HOBO Weather Stations Connecting the Sensor to the Logger To start using the Silicon Pyranometer smart sensor stop the HOBO Weather Station logger and insert the modular jack into an available port If a port is not available use a 1 to 2
3. Silicon Pyranometer Smart Sensor Part S LIB M003 The Silicon Pyranometer smart sensor is designed to work with the HOBO Weather Station logger The smart sensor has a plug in modular connector that allows it to be added easily to a HOBO Weather Station All calibration parameters are stored inside the smart sensor which automatically communicates configuration information to the logger without the need for any programming calibration or extensive setup Inside this Package e Silicon Pyranometer smart sensor Specifications Silicon Pyranometer Smart Sensor Measurement Range 0 to 1280 W m Spectral Range 300 to 1100 nm see Figure 4 Accuracy Angular Accuracy Typically within 10 Wim or 5 whichever is greater in sunlight Additional temperature induced error 0 38 Wim C from 25 C 0 21 W m F from 77 F Cosine corrected 0 to 80 degrees from vertical see Figure 5 Azimuth Error lt 2 error at 45 degrees from vertical 360 degree rotation Resolution 1 25 W m Drift lt 2 per year Calibration Factory recalibration available Operating Temperature Range 40 to 75 C 40 to 167 F Environmental Rating Weatherproof Housing Anodized aluminum housing with acrylic diffuser and O ring seal Dimensions 4 1 cm height x 3 2 cm diameter 1 5 8 in x 1 1 4 in Weight 120 g 4 oz Bits per Sample 10 Number of Data Channels
4. adaptor which allows you to plug two sensors into one port Part S ADAPT The next time you use the HOBO Weather Station it will automatically detect the new smart sensor The HOBO Weather Station supports a maximum of 15 data channels this sensor uses one channel Launch the logger and verify the sensor is functioning correctly See the HOBO Weather Station User s Guide for more details about connecting smart sensors to the HOBO Weather Station Operation The Silicon Pyranometer smart sensor supports measurement averaging When measurement averaging is enabled data is sampled more frequently than it is logged The multiple samples are then averaged together and the average value is stored as the data for the interval For example if the logging interval is set at 10 minutes and the sampling interval is set at 1 minute each recorded data point will be the average of 10 measurements Measurement averaging is useful for reducing noise in the data It is recommended that you use measurement averaging whenever the Silicon Pyranometer smart sensor is placed in an area where the light level can vary quickly with respect to the logging interval for example during partly cloudy conditions Note that fast sampling intervals less than 1 minute may significantly reduce battery life See the HOBO Weather Station User s Guide for more details about sensor operation and battery life Page 4 of 6 Silicon Pyranometer Smart Sensor Spectral Ch
5. aracteristics This sensor uses a silicon photodiode to measure solar power per unit area watts per square meter Silicon photodiodes are not ideal for use as solar radiation sensors and the photodiode in this Silicon Pyranometer is no exception see Figure 4 An ideal pyranometer has equal spectral response from 280 to 2800 nm However when calibrated properly and used correctly the Silicon Pyranometer smart sensor should perform well in most situations The sensor is calibrated for use in sunlight an Eppley Precision Spectral Pyranometer is used as reference standard Accordingly if the sensor is used under natural sunlight the measurement errors will be small Note that significant errors may result from using the sensor under artificial light within plant canopies in greenhouses or any other conditions where the spectral content differs from sunlight Sun s Relative Intensity and the Typical Relative Response of the Silicon Pyranometer versus Wavelength 1 0 1 0 0 9 z 0 9 0 8 Silicon Pyranometer f 0 8 D a rn clas Sunlight Oo 07 ae 0 7 G x aut 2 ni c 06 4 0 6 g E 0 5 r 0 5 T 0 4 0 4 x n c K F 0 3 0 2 0 1 0 0 250 750 1250 1750 2250 Wavelength nm Figure 4 S LIB M003 Silicon Pyranometer Response Curve Page 5 of 6 Photodetector Relative Response Silicon Pyranometer Smart Sensor Cosine Correction The Silico
6. is recommended that you use vinegar to remove hard water deposits from the diffuser element Under no circumstances should the sensor be immersed in any liquid Verifying Sensor Accuracy It is recommended that you test the Silicon Pyranometer smart sensor annually for accuracy If the sensor is not providing accurate data it may be damaged or out of calibration If you are unsure of accuracy send the smart sensor back to Onset for testing and possible re calibration Only Onset can complete calibration Contact Onset or your dealer for a Return Merchandise Authorization RMA number before sending the sensor Page 6 of 6
7. n Pyranometer smart sensor housing is designed to give an accurate cosine response Figure 5 shows a plot of relative intensity versus angle of incidence for a typical sensor and for the theoretical ideal response Deviation from ideal response is less than 5 from 0 to 70 degrees and less than 10 from 70 to 80 degrees Note that as the angle approaches 90 degrees the ideal cosine response approaches zero As a result small errors in measured intensity will result in very large percentage errors compared to the ideal response from 80 to 90 degrees Typical Cosine Response of Silicon Pyranometer 120 100 Ideal Response ee sete Silicon Pyranometer 80 60 40 Percent Relative Response 20 0 10 20 30 40 50 60 70 80 90 100 Angle from Vertical Degrees Figure 5 S LIB M003 Typical Cosine Response Curve Maintenance Dust on the sensor will degrade sensor accuracy Periodically inspect the sensor and if necessary gently clean the diffuser with a damp sponge Do not open the sensor as there are no user serviceable parts inside Warning DO NOT use alcohol organic solvents abrasives or strong detergents to clean the diffuser element on the Silicon Pyranometer smart sensor The acrylic material used in the sensor can be crazed by exposure to alcohol or organic solvents Clean the sensor only with water and or a mild detergent such as dishwashing soap if necessary It
8. t faces toward the equator minimizing the chance of shading 5 Mount the bracket on the mast with the two U bolt assemblies mounting it high enough on the mast to avoid the possibility of shading the sensor Note If you mount the sensor above eye level use a step ladder or other secure platform when leveling the sensor so that you can clearly view the Light Sensor Level Part M LLA Silicon Pyranometer Mast Smart Sensor Thumbscrews Silicon Pyranometer gt Sensor Cable Light Sensor Bracket _ U bolt Assembly Figure 1 Silicon Pyranometer Sensor Bracket Mounting 6 Make sure the screws holding the sensor to the mounting bracket are loose Page 2 of 6 Silicon Pyranometer Smart Sensor 7 Place the Light Sensor Level on the Silicon Pyranometer smart sensor 8 Adjust the height of the thumbscrews to level the sensor start with the thumbscrews protruding about 1 16 inch from the bracket 9 Once the sensor is near level tighten the Phillips head screws 10 Check the level and repeat above steps if necessary see Figure 2 11 IMPORTANT Don t forget to remove the level when you are done with it Light Sensor Level Silicon Remove for Operation Pyranometer Sensor Figure 2 Leveling the Sensor on the Light Sensor Bracket Specialized Application Mounting To mount the Silicon Pyranometer sensor using a mounting plate of your own design 1 Drill a 0
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