Development of Portable Rain Calibrator Prototype using Submersible Pump

Abstract

During the rainy season, floods in Indonesia increase rapidly, so that rainfall data is needed that is valid and accurate.
Rainfall equipment in Indonesia must be calibrated every year. However, to calibrate all equipment installed in almost all of
Indonesia requires portable calibrator equipment. Lipi has made portable rainfall using a peristaltic pump, while BMKG has a
calibrator equipment called Rainfall is still manual. In this research, a rainfall calibrator prototype was made that is able to measure
rainfall intensity using a microcontroller that is used to regulate the speed of submersible pumps. Testing the prototype used 2
methods, namely by using the volumetric method and the comparison method. The artifact used for calibration is a tipping bucket
sensor with a resolution of 0.2 mm. The results of calibration of artifacts using prototypes compared to the results of rainfall
calibration, obtained the difference in the intensity of 0.22 mm / minute with an error of 6.25%.