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Related Manuals for Apogee Instruments DLI-400
Summary of Contents for Apogee Instruments DLI-400
- Page 1 DAILY LIGHT INTEGRAL AND PHOTOPERIOD METER Models: DLI-400, DLI-500, and DLI-600 Rev: 31-Jan-2022 APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM Copyright © 2022 Apogee Instruments, Inc.
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Page 3: Certificate Of Compliance
RoHS 3 compliant using exemption 6c. Further note that Apogee Instruments does not specifically run any analysis on our raw materials or end products for the presence of these substances, but we rely on the information provided to us by our material suppliers. - Page 4 PAR (models DLI-400 and DLI-500) or ePAR (model DLI-600). The DLI-400 and DLI-500 both measure PAR, however, the DLI-500 is accurate under all light sources, while the DLI-400 is a low-cost option that is accurate under sunlight and broadband light sources only. PAR and ePAR are often expressed as photosynthetic photon flux density (PPFD) and extended photosynthetic photon flux density (ePPFD), respectively, in units of micromoles per square meter per second (µmol m...
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Page 5: Meter Models
All lights DLI-600 ePAR A DLI meter’s model number and serial number are located on the bottom of the meter. If the manufacturing date of a specific meter is required, please contact Apogee Instruments with the serial number of the meter. -
Page 6: Specifications
SPECIFICATIONS DLI-400 DLI-500 DLI-600 Calibration Uncertainty ± 5 % Measurement Repeatability Less than 0.5 % 0 to 4000 mol m Measurement Range Long-term Drift per Year Less than 2 % per year Field of View 180° Spectral Range (± 5 nm) - Page 7 (measured with a spectroradiometer). This method calculates spectral error and does not consider calibration, cosine, or temperature errors. PAR Definition ePAR Definition DLI-400 DLI-500 DLI-600 Wavelength [nm] Mean spectral response of replicate DLI meters compared to PPFD and ePPFD weighting function. Spectral response measurements were made at 10 nm increments across a wavelength range of 300 to 800 nm in a monochromator with an attached electric light source.
- Page 8 DLI-400 DLI-500 DLI-600 Radiation Source PPFD Error [%] PPFD Error [%] ePPFD Error [%] Clear Sky Overcast CWF T5 -1.2 Metal Halide -8.8 -0.4 Ceramic Metal Halide -0.4 Mogul Base HPS -6.8 -0.1 -0.1 Dual-ended HPS -1.6 CW LED -7.8 -1.0...
- Page 9 Directional, or cosine, response is defined as the measurement error at a specific angle of radiation incidence. Error for Apogee DLI meter is approximately ± 5 % at solar zenith 75°. DLI-400 DLI-500 and DLI-600 Mean directional response of replicate meters. Directional response measurements were...
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Page 10: Deployment And Installation
DEPLOYMENT AND INSTALLATION Place the DLI meter wherever measurements are desired. To accurately measure PPFD incident on a horizontal surface, the sensor must be level. The ¼-20 threaded mount can be used to secure the meter in place and ensure consistent measurements. - Page 11 MEASUREMENT AND OPERATION Meter functionality covered in this section is the same for all models. NOTE: Although the meter screen goes to sleep after three minutes of inactivity, the meter is always on in the background taking measurements. To turn off the meter completely, remove the batteries (see page 12). Every 3 minutes, the DLI meter will automatically make 10 measurements over a 4-second period.
- Page 12 Battery life is approximately 6 months. However, this can be reduced by usage and ambient conditions. When batteries need to be changed, the screen will display “bAtt Lo” upon waking up. IMPORTANT: Removing the bottom cover will result in the loss of all current-day data.
- Page 13 1. Once the batteries are installed, the meter will automatically make a measurement every 3 minutes, whether the screen is on or off. 2. Place the meter in the location you would like to measure and leave it there for the desired measurement duration.
- Page 14 IMPORTANT: Transferring stored data requires removal of the bottom cover, which will result in the loss of all current-day data. 1. Using a small Phillips-head screwdriver, turn the two screws at the bottom until they turn freely (this should take roughly 5 turns).
- Page 15 1. Press and hold the button for about eight seconds until the reset timer appears on the display. If you do not want to reset the meter, release the button before the countdown is over to cancel the reset. If you do want to reset the meter, continue holding the button until the countdown reaches zero.
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Page 16: Maintenance And Recalibration
MAINTENANCE AND RECALIBRATION Moisture or debris on the diffuser is a common cause of low readings. The meter has a domed diffuser and housing for improved self-cleaning from rainfall/irrigation, but materials can accumulate on the diffuser (e.g., dust during periods of low rainfall, salt deposits from evaporation of sea spray or sprinkler irrigation water) and partially block the optical path. - Page 17 Homepage of the Clear Sky Calculator. Two calculators are available: one for quantum meters (PPFD) and one for pyranometers (total shortwave radiation). Clear Sky Calculator for quantum sensors. Site data are input in blue cells in the middle of page and an estimate of PPFD is returned on right-hand side of page.
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Page 18: Troubleshooting And Customer Support
TROUBLESHOOTING AND CUSTOMER SUPPORT Independent Verification of Functionality Apogee DLI meters display the current PPFD measurement. A quick and easy check of meter functionality can be determined by directing the sensor head toward a light source and verifying the sensor provides a reasonable measurement. -
Page 19: Return And Warranty Policy
RETURN AND WARRANTY POLICY RETURN POLICY Apogee Instruments will accept returns within 30 days of purchase as long as the product is in new condition (to be determined by Apogee). Returns are subject to a 10 % restocking fee. WARRANTY POLICY... - Page 20 84321, USA 5. Upon receipt, Apogee Instruments will determine the cause of failure. If the product is found to be defective in terms of operation to the published specifications, due to a failure of product materials or craftsmanship, Apogee Instruments will repair or replace the items free of charge.
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