DLI-500 全光譜測量儀 – 作為2022年新款，Apogee Instruments推出的DLI-500是一款設(shè)計優(yōu)雅、操作簡便的設(shè)備，適用于在各種光源下進(jìn)行光合有效輻射（PAR；400-700納米）水平的點(diǎn)檢，以及測量每日光積分（DLI）和光周期。DLI指24小時內(nèi)入射到平面上的PAR或擴(kuò)展PAR（ePAR）總量，單位為摩爾每平方米每天（mol m?2 d?1）。光周期則指24小時內(nèi)PAR或ePAR入射到平面上的總時間，單位為小時（h）。PAR、DLI和光周期影響植物的生長發(fā)育，通常在溫室和人工氣候室中測量，以輔助光照管理和決策。DLI-500在所有光源下均能保持高精度測量。若您正在尋找一款經(jīng)濟(jì)型選項，且測量場景于太陽光或某些寬帶光源，請參考我們的DLI-400型號。

APOGEE– 我們的產(chǎn)品由Apogee Instruments工程團(tuán)隊在作物生理學(xué)家Bruce Bugbee博士指導(dǎo)下研發(fā)，被農(nóng)業(yè)專業(yè)人士和研究人員視為測量植物光照PAR水平的黃金標(biāo)準(zhǔn)。DLI-500采用了與我們的MQ-500測量儀相同的超精確400-700納米全光譜光電探測器，具備更多特性和功能，但未配備兩米長的線纜。

精確、穩(wěn)定的測量 – 我們研究級傳感器的精確性和穩(wěn)定性贏得了科學(xué)家和種植者的信賴。業(yè)余級測量儀初始測量可能精確，但精度會迅速漂移。而Apogee研究級量子傳感器擁有行業(yè)的精度漂移率，每年低于2%。所有傳感器均可溯源至NIST標(biāo)準(zhǔn)，并在美國猶他州洛根的工廠進(jìn)行制造和校準(zhǔn)。

多種測量模式 – 這款堅固、防水且緊湊的測量儀非常適合對光合有效光子通量密度（PPFD）或ePPFD、DLI及光周期進(jìn)行單次（區(qū)域點(diǎn)檢）或連續(xù)測量。DLI-500測量儀有兩種屏幕模式顯示測量數(shù)據(jù)：存儲數(shù)據(jù)模式和實時數(shù)據(jù)模式。存儲數(shù)據(jù)屏幕顯示DLI測量值、光周期以及數(shù)據(jù)采集日期（可追溯至99天前）。實時數(shù)據(jù)屏幕則顯示過去2.5秒內(nèi)PPFD的移動平均值。測量并控制植物接收的DLI和光照時長（光周期）對于優(yōu)化植物健康、誘導(dǎo)開花以及引發(fā)其他植物形態(tài)效應(yīng)至關(guān)重要。PPFD、DLI和光周期數(shù)據(jù)既可在屏幕上查看，也可通過USB-C線纜下載至電腦進(jìn)行分析。

堅固耐用，開箱即用 – DLI-500制造工藝堅固，防護(hù)等級達(dá)到IP65，能夠承受惡劣和潮濕環(huán)境。它可手持進(jìn)行點(diǎn)檢，直接放置于任何水平表面，或通過底部的標(biāo)準(zhǔn)?-20螺紋接口，安裝到常見的相機(jī)三腳架、夾具或支柱上。DLI測量儀由鑄造丙烯酸擴(kuò)散器（濾光片）、光學(xué)濾光片、光電二極管、信號處理電路以及安裝在ASA塑料外殼中的LCD顯示屏構(gòu)成。每套DLI產(chǎn)品包含：測量儀主機(jī)、保護(hù)性便攜包、兩節(jié)AAA電池、快速入門指南、一把螺絲刀、一個便于安裝的地插，以及一根用于將測量儀存儲數(shù)據(jù)以CSV文件格式下載到電腦的USB-C線纜。

美國制造 – 所有測量儀均在美國猶他州洛根的總部設(shè)計、制造和校準(zhǔn)。Apogee Instruments為科學(xué)家和種植者創(chuàng)造研究級儀器已有超過25年歷史。所有測量儀均享有行業(yè)的四年質(zhì)保

DLI-500 FULL-SPECTRUM METER – New for 2022, the Apogee Instruments’ DLI-500 is an elegant, simple-to-use device for spot checking photosynthetically active radiation (PAR; 400-700 nm) levels and measuring daily light integral (DLI) and photoperiod under all light sources. 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). PAR, 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-500 is accurate under all light sources, but if you are looking for a low-cost option accurate under sunlight and some broadband light sources only, see our DLI-400 model.

APOGEE QUALITY – Our products are developed for use by the Apogee Instruments’ engineering team under the direction of world-renowned crop physiologist, Dr. Bruce Bugbee, and are considered the gold-standard by agricultural professionals and researchers for measuring PAR levels for growing plants. The DLI-500 features the same ultra-accurate 400-700 nm full-spectrum photodetector as our famous MQ-500 meter, with even more features and functionality, but it lacks a two meter cable.

ACCURATE, STABLE MEASUREMENTS – Our research-grade sensors are trusted by scientists and serious growers all over the world for their accuracy and stability. Hobby-grade meters are often accurate out of the box, but drift in accuracy quickly. However, Apogee research-grade quantum sensors have an industry-leading accuracy drift rate of less than 2 % per year. All sensors are NIST traceable and are built and calibrated at our headquarters in Logan, Utah, USA.

MEASUREMENT MODES – This rugged, water resistant, and compact meter is perfect for single (spot checking areas) or continuous measurements of PPFD or ePPFD; DLI; and photoperiod. The DLI-500 meter has two different screen modes to display the measurements: 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. Measuring and controlling the DLI and the hours of light a plant receives (photoperiod) is critical for optimizing plant health, triggering flowering, and inducing other plant morphology effects. PPFD, DLI, and photoperiod data can be viewed onscreen or downloaded via USB-C cable for analysis.

RUGGED & READY TO USE – Built tough and rated IP65 to withstand harsh and wet environments, the DLI-500 can be carried around for spot checking, placed directly on any level surface, or mounted by attaching to commonly available camera tripods, clamps, or stakes using the standard ?-20 threaded port on the bottom. 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. Each DLI package includes the meter, a protective carrying case, two AAA batteries, a quickstart instruction guide, a screwdriver, a soil spike for easy mounting, and a USB-C cable for downloading the meter’s stored data as a CSV file to a computer.

MADE IN THE USA – All meters are designed, built, and calibrated at our headquarters in Logan, Utah, USA. Apogee Instruments has been creating research-grade instruments for scientists and serious growers for over 25 years. All meters are backed by our industry leading four-year warranty