Specification Sheet

Product Specicaons
Features
APOGEE FULL-SPECTRUM QUANTUM METER |
MQ-500
Calibraon Uncertainty ± 5 %
Measurement Range 0 to 4000 μmol m⁻² s⁻¹
Measurement Repeatability Less than 0.5 %
Long-term Dri (Non-stability) Less than 2 % per year
Non-linearity Less than 1 % (up to 4000 μmol m⁻² s⁻¹)
Response Time Less than 1 ms
Field of View 180°
Spectral Range 389 to 692 nm ± 5 nm (wavelengths where response is greater
than 50 % of maximum)
Spectral Selecvity Less than 10 % from 412 to 682 nm ±5 nm
Direconal (Cosine) Response ± 5 % at 75° zenith angle
Azimuth Error Less than 0.5 %
Tilt Error Less than 0.5 %
Temperature Response -0.11 ± 0.03 % per C
Uncertainty in Daily Total Less than 5 %
Detector Blue-enhanced silicon photodiode
Housing Anodized aluminum body with acrylic diuser
IP Rang IP68
Operang Environment 0 to 50 C; less than 90 % non-condensing relave humidity up to
30 C; less than 70 % non-condensing relavity humidity from 30
to 50 C; separate sensors can be submerged in water up to 30 m
Cable 2 m of shielded, twisted-pair wire; addional cable available;
TPR jacket
Warranty 4 years against defects in materials and workmanship
MQ-500
Accurate, Stable Measurements
Long-term non-stability determined
from mulple replicate quantum sensors
in accelerated aging tests and eld
condions is less than 2 % per year.
Unique Design
Measure photosynthecally acve
radiaon with a research grade, full
spectral response sensor. Oers a self-
cleaning, cosine-corrected head that is
fully-poed for a waterproof design.
Typical PPFD Measurement
Applicaons
• Incoming and reected PPFD over and
under plant canopies in greenhouses, in
elds, and in growth chambers
• Aquac environments including salt
water aquariums and freshwater lakes and
streams
Calibraon Traceability
Apogee SQ-500 sensors are calibrated
through side-by-side comparison to
the mean of (4) Apogee model SQ-500
transfer standard sensors under T5 cool
white uorescent lamps. The transfer
standard sensors are calibrated through
side-by-side comparison to the mean
of at least (3) LI-COR model LI-190R
reference quantum sensors under T5 cool
white uorescent lamps. The reference
sensors are recalibrated on a biannual
schedule with a LI-COR model 1800-02
and quartz halogen lamp that are traceable
to the Naonal Instute of Standards and
Technology (NIST).
A research-grade PAR meter with an improved
spectral response providing accurate PAR/PPFD
measurements under all light sources, including
LEDs