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
Apogee Instruments SP-522 pyranometers consist of a thermopile detector, acrylic diffuser, heater, and signal processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a measurement device. Sensors are potted solid with no internal air space and are designed for continuous measurement of shortwave radiation in outdoor environments. The SP-522 model outputs a digital signal using Modbus RTU communication protocol over RS-232 or RS-485.
The SP-522-SS is an upward-looking thermopile pyranometer with a digital signal using Modbus RTU protocol over RS-232 or RS-485. The sensor incorporates a blackbody thermopile detector and acrylic diffuser with a rugged, self-cleaning sensor housing design, and high-quality cable terminating in pre-tinned pigtail leads for easy connection to dataloggers and controllers. Typical applications include shortwave radiation measurement in agricultural, ecological, and hydrological weather networks. Sensors are also used to optimize photovoltaic systems. Sensor includes IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement for maintenance and recalibration.
| ISO 9060:2018 | Class C (first response) |
| Input Voltage Requirement | 5.5 to 24 V |
| Average Max Current Draw | 4 mA (heater off); 30 mA (heater on) |
| Calibration Uncertainty at 1000 W mˉ2 | Less than 3 % |
| Measurement Repeatability | Less than 1 % |
| Long-term Drift (Non-stability) | Less than 2 % per year |
| Non-linearity | Less than 1 % (up to 2000 W mˉ2) |
| Detector Response Time | 0.5 s (baudrate dependant) |
| Field of View | 180? |
| Spectral Range | 385 to 2105 nm (wavelengths where response is 50 % of maximum) |
| Directional (Cosine) Response | Less than 30 W mˉ2 at 80? solar zenith |
| Temperature Response | Less than 5 % from -15 to 45 C |
| Zero Offset A | Less than 5 W mˉ2; Less than 10 W mˉ2 (heated) |
| Zero Offset B | Less than 5 W mˉ2 |
| Operating Environment | -50 to 80 C; 0 to 100 % relative humidity; can be submerged in water up to 30 m |
| Dimensions | 30.5 mm diameter, 37 mm height |
| Mass (with 5 m of cable) | 140 g |
| Cable | 5 m of two conductor, shielded, twisted-pair wire, additional cable available in multiples of 5 m; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires |
| Warranty | 4 years against defects in materials and workmanship |
| Manufactured | Made in the USA |
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