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Apogee  |  SKU: E-804-DLI-400

DLI-400: Daily Light Integral and Photoperiod Meter (Sunlight Only)

Regular price $475.00 CAD
Title

Description

Important Info

Apogee's new DLI-400 meter is designed to measure photosynthetically active radiation (PAR) 400–700 nm and is a low-cost option that is accurate under sunlight and some broadband light sources only. Post-measurement correction factors can be applied to improve accuracy under light sources; click here for more information. In addition to measuring PAR, the DLI-400 meter calculates daily light integral (DLI) and photoperiod. DLI refers to the total amount of PAR or extended PAR (ePAR) incident on a plane in a 24-hour period, expressed in units of moles per square meter per day (mol m-2 d-1). Photoperiod is the total amount of time in which PAR or ePAR is incident on a plane during a 24-hour period and is expressed in units of hours (h). Both DLI and photoperiod influence plant growth and development, and they are often measured in greenhouses and growth chambers to aid in light management and decision making. 

 

The DLI-400 meter has two different screen modes: stored data and live view data. In the stored data screen, it shows the DLI measurement, photoperiod, and which day the data was collected (up to 99 days ago). The live view data screen displays a running average of PPFD from the last 2.5 seconds.

  

The DLI meters consist of a cast acrylic diffuser (filter), optical filter, photodiode, signal processing circuitry, and an LCD display mounted in an ASA plastic housing. DLI meters are designed for single or continuous measurements of PPFD or ePPFD; DLI; and photoperiod. The DLI meter uses a USB-C cable (included with the meter) to download the stored data as a CSV file to a computer.

Specifications
Calibration Uncertainty  ± 5 %
Measurement Repeatability Less than 0.5 %
Measurement Range 0 to 4000 µmol mˉ² sˉ¹
Long-term Drift Less than 2 % per year
Field of View 180˚
Spectral Measurement Range(± 5 nm) 370 to 650 nm (sunlight only)
Directional (Cosine) Response ± 5 % at 75˚ zenith angle
Temperature Response -0.04 % per C
Response Time 2.5 seconds
Measurement Frequency 3 minutes
Data Log Capacity 99 days (DLI & Photoperiod), 10 days (30 min PPFD/ePPFD averages)
Non-linearity Less than 1 % (up to 4000 µmol mˉ² sˉ¹)
Stored Data Resolution (PPFD) 0.1 µmol mˉ² sˉ¹ (when ≥ 1000, the screen will not display the decimal)
Stored Data Resolution (DLI) 0.1 mol mˉ² dayˉ¹
Stored Data Resolution (Photoperiod) 0.1 hours
Connectivity CSV file via USB-C data transfer
ADC Resolution 24 bits
Operating Environment -10 to 60 C; 0 to 100 % relative humidity
Ingress Protection IP65
Mounting Compatibility Brass 1/4-20 threaded mount
Battery Life Approximately 6 months
Dimensions 1.91 W x 2.31 H x 0.93 D (inches)
Mass 67 g
Warranty 4 years against defects in materials and workmanship
Manufactured Made in the USA

 

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