Apogee Instruments PYRANOMETER SP-421 Owner's Manual - Page 6
Browse online or download pdf Owner's Manual for Measuring Instruments Apogee Instruments PYRANOMETER SP-421. Apogee Instruments PYRANOMETER SP-421 18 pages.
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SPECIFICATIONS
Input Voltage Requirement
Current Drain
Output Range
Calibration Uncertainty
Measurement Repeatability
Long-term Drift
(Non-stability)
Non-linearity
Response Time
Field of View
Spectral Range
Directional (Cosine) Response
Temperature Response
Operating Environment
Dimensions
Mass
Cable
Calibration Traceability
Apogee Instruments SP series pyranometers are calibrated through side-by-side comparison to the mean of four Apogee
model SP-110 transfer standard pyranometers (shortwave radiation reference) under high intensity discharge metal halide
lamps. The transfer standard pyranometers are calibrated through side-by-side comparison to the mean of at least two ISO-
classified reference pyranometers under sunlight (clear sky conditions) in Logan, Utah. Each of four ISO-classified reference
pyranometers are recalibrated on an alternating year schedule (two instruments each year) at the National Renewable
Energy Laboratory (NREL) in Golden, Colorado. NREL reference standards are calibrated to the World Radiometric Reference
(WRR) in Davos, Switzerland.
0.6 s, time for detector signal to reach 95 % following a step change; fastest data transmission rate for
360 to 1120 nm (wavelengths where response is 10% of maximum;
± 5 % at 75º zenith angle (see Cosine Response below)
0.04 ± 0.04 % per C (see Temperature Response below)
-40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m
5 m of two conductor, shielded, twisted-pair wire, additional cable available in multiples of 5 m;
santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail
SP-421
5.5 to 24 V DC
0.6 mA (quiescent), 1.3 mA (active)
-2
0 to 1750 W m
± 5 % (see Calibration Traceability below)
Less than 1 %
Less than 2 % per year
Less than 1 % (up to 1750 W m
SDI-12 circuitry is 1 s
180º
see Spectral Response below)
44.0 mm height, 23.5 mm diameter
177 g (with 5 m cable)
lead wires
-2
)
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