Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual
The SP-230 (All-season) is a heated pyranometer with a 0.2 W heater to keep water (liquid and frozen) off the sensor and minimize errors caused by dew, frost, rain, or snow blocking the optical path. Sensor includes IP68 marine-grade stainless-steel cable connector 30 cm from the head to simplify sensor removal and replacement for maintenance and recalibration.
Figure 1: Solar radiation after a January frost in Logan, Utah with overcast conditions until 11 a.m. The two replicate Apogee SP-230 pyranometers were nearly identical to a heated and ventilated reference pyranometer. In spite of the bright sunlight after 11 a.m., the frost on two unheated glass dome thermopile and four replicate unheated castle design pyranometers did not melt until after 4 p.m. (1600 hours).
Figure 2. The effect of frost and snow accumulation for three groups of pyranometers in Logan UT, expressed as a percentage of true reading. Castle design and unheated thermopile sensors averaged a 20% error for the month with a maximum error of 80%. Data for Figure 1 is from day 12.
| ISO 9060:2018 | Class C (fast response) |
| Power Supply | 12 V DC for heater |
| Current Draw | 15.4 mA |
| Heater | 780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DC |
| Sensitivity | 0.2 mV per W mˉ2 |
| Calibration Factor (reciprocal of output) | 5 W mˉ2 per mV |
| Calibration Uncertainty at 1000 W mˉ2 | Less than 3 % |
| Calibrated Output Range | 0 to 400 mV |
| Measurement Repeatability | Less than 1 % |
| Non-stability (Long-term Drift) | Less than 2 % per year |
| Non-linearity | Less than 1 % (up to 2000 W mˉ2) |
| Response Time | Less than 1 ms |
| Field of View | 180? |
| Spectral Range | 360 to 1120 nm (wavelengths where response is 10 % of maximum) |
| Directional (Cosine) Response | ± 5 % at 75? zenith angle |
| Temperature Response | 0.04 ± 0.04 % per C |
| Operating Environment | -40 to 70 C; 0 to 100 % relative humidity; can be submerged in water up to depths of 30 m |
| Dimensions | 24 mm diameter, 33 mm height |
| Mass (with 5 m of cable) | 90 g |
| Warranty | 4 years against defects in materials and workmanship |
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