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Description
The SMP10X Smart pyranometer is a departure from the normal SMP range and now focues purely on the RS485 Modbus output. The analogue output has been completedly dropped from the SMP10X to provide a newly stabilised internal digital calibration profile and drift control, officially rating the sensor drift at less than ±0.5% over 5 years The thermopile sensing element features faster response, better linearity and a wider measurement range than the SMP3. There are two high quality concentric glass domes, 2mm thick, which provide improved directional error and thermal isolation. The SMP10 has an internal desiccant that provides at least 10 years maintenance free operation. Negative ranges are provided to allow the sensor to show levels at night when there is heat emitted from the sensor.
As with all of the SMP’s, the SMP10X has the RS485 Modbus RTU interface, very low power requirements and are supplied with comprehensive, traceable, calibration certificates. Calibrations are traceable to the World Radiometric Reference (WRR) in Davos Switzerland and are performed in accordance with ISO 9847:2023, ‘Solar Energy – Calibration of Field Pyranometers by comparison to a Reference Pyranometer’s and are supplied with comprehensive, traceable, calibration certificates.
Diagram
Specification
| ISO 9060:2018 Classification: | Spectrally Flat Class A |
| Spectral Range: | 285 to 2800nm (50% Points) 270 to 3,000nm (20% Points) |
| Response Time (95%): | <2 Seconds |
| Zero Offset A: | <±7 W/m² |
| Zero Offset B: | <±2 Wm² |
| Directional Error (Up to 80º with 1000 Wm² beam): | <±9 Wm² |
| Temperature Dependence of Sensitivity: | <0.5% (-20 to 50°C) <1.0% (-40 to 70°C) |
| Accuracy of Bubble Level | < 0.1 |
| Field of View | 180° |
| Digital Output: | 2 wire RS485 Modbus RTU |
| Digital Output Range: | -400 to 4000W/m² |
| Operating Temperature: | -40 to +80°C |
| Supply Voltage: | 5 to 30vDC |
| Power Consumption (at 12vDC): | 60mW |
| Ingress Protection: | IP67 |
SMP10X instruments have an 8-pin socket and can be connected to a standard cable with a pre-wired waterproof 8 pin plug and flying leads. Cable lengths of 10m, 25m, 50m and 100m are available.
To improve the measurement accuracy of the SMP10X pyranometers the CVF4 ventilation unit can be used. It can be used outdoors under all weather conditions and includes a built in heater to keep the air just above ambient temperature which helps disperse precipitation and melt frost, or even melt snow and ice in cold climates. The CVF4 has a tacho output that can be used to check the proper operation of the CVF4. The output signal is 5V and nominal output should be at 146Hz. Higher frequency would suggest the filter needs replaced, whilst lower frequency could highlight an issue with the ventilator.
Field Data Logger Options
The Meteon 2.0 is a significantly more advanced and versatile data logger than the Meteon, particularly for users working with modern “Smart” Kipp & Zonen pyranometers. It can accept up to 5 Smart pyranometers and one analogue pyranometer, plus one Modbus temperature and a pulse input for kWh values. The Meteon 2.0 can log up to 380,000 sets of min, max and average values. This logger is ideal for those needing to monitor multiple parameters (irradiance, temperature, energy) in PV applications.
If you require a permanent solar panel efficiency monitoring system, please contact us directly to discuss your requirements. We can provide bespoke tailored systems to fit any requirements with loggers suitable for transmitting data via Mobile network, Wi-Fi, Ethernet or even a satellite connection.
Associated University Paper
Nakhon Pathom Rajabhat University, Thailand – Basic Meteorology
