Apogee Instruments DLI-400 - SPECIFICATIONS; Calibration Traceability

SPECIFICATIONS
DLI-400
DLI-500
DLI-600
Calibration Uncertainty
± 5 %
Measurement Repeatability
Less than 0.5 %
Measurement Range
0 to 4000 mol m
-2
s
-1
Long-term Drift per Year
Less than 2 % per year
Field of View
180°
Spectral Range (± 5 nm)
370 to 650 nm
390 to 690 nm
390 to 760 nm
Directional (Cosine) Response
± 5 % at 75° zenith angle
Azimuth Error
Less than 1 %
Temperature Response
-0.04 % per C
-0.11 ± 0.04 % per C
Measurement Frequency
3 minutes
Response Time
2.5 seconds
Data Log Capacity
99 days (DLI & Photoperiod), 10 days (30 min PPFD/ePPFD averages)
Time Accuracy
± 53 seconds per month
Battery Type
2 AAA batteries
Battery Life
Approximately 6 months
ADC Resolution
24 bits
Mounting compatibility
Brass
1
/
4
-20 threaded mount
Connectivity
CSV file via USB-C data transfer
Stored Data Resolution (PPFD)
0.1 µmol m
-2
s
-1
(when ≥ 1000, the screen will not display the decimal)
Stored Data Resolution (DLI)
0.1 mol m
-2
day
-1
(when ≥ 1000, the screen will not display the decimal)
Stored Data Resolution
(Photoperiod)
0.1 hours
Housing
ASA plastic
Ingress Protection
IP65
Operating Environment
-10 to 60 C; 0 to 100 %
relative humidity
-40 to 70 C; 0 to 100 % relative humidity
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
Calibration Traceability
Apogee DLI meters are calibrated through side-by-side comparison to the mean of transfer standard quantum
sensors placed under a reference LED (Ultraviolet: 1.5%; Blue: 36%; Green: 21%; Red: 41%; Far-Red: 0.5%). The
reference quantum sensors are recalibrated with a 200 W quartz halogen lamp traceable to the National Institute
of Standards and Technology (NIST).