A reliable model pyranometer, RMP001 was fabricated and calibrated against a reference
commercial standard pyranometer, CMP3 obtaining a calibration constant of 5230 0.024 2 Wm .
Insolation data at 1 minute intervals was recorded under actual environmental conditions of Mubi,
Adamawa State – Nigeria, using a data logger. The insolation was monitored for a period of 57 days.
Results show that insolation is larger than on a dust-free day because dusts reflect sunlight off their sides.
It is clear that the fabricated pyranometer (RMP001) performs about the same as the commercial standard
pyranometer (CMP3). The differences in results obtained are so small enough to obtain sufficient accurate
data especially when insolation is averaged over a day.