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The SMP22 has been replaced by the SMP22x.
For this application the CMP10 and SMP10 are advised as they have an internal drying cartridge that will last for at least 10 years.
Please note that the pyranometer needs to be mounted in the same angle (POA) as the PV panel.
For users that prefer the desiccant visible Kipp & Zonen offers the CMP11 and SMP11 with visible and user changeable desiccant.