Utilization of Semi-Cylinder Capacitors for Level Measurement Thai Type Cassava Starch
Dina Mauliyani Qoriah (a*), Arif Surtono (b), Gurum Ahmad Pauzi (b), Sri Wahyu Suciyati (b)

a) Physics Instrumentation of Faculty of Math and Science, Lampung University
Jalan Sumantri Brojonegoro No 1 Gedong Meneng, Bandar Lampung 35145, Indonesia

b) Faculty of Math and Science, Lampung University
Jalan Sumantri Brojonegoro No 1 Gedong Meneng, Bandar Lampung 35145, Indonesia

Abstract

It has been realized that the measurement of the Thai type of cassava starch using a semi-cylindrical capacitor. This measurement is carried out by providing an input signal to the semi-cylindrical capacitor plate using the IC XR-2206 oscillator with a frequency of 100 kHz. The output signal from the capacitor is in the form of an AC voltage which is then forwarded to the full wave rectifier circuit. The output voltage of the rectifier is a DC voltage and the results are displayed using a DSO oscilloscope. Cassava starch content was measured using the specific gravity method and the stress was measured using a semicylindrical capacitor. In measuring the starch content, the starch content was 19.12 - 28.76% (range 9.64%) and gave an output voltage of 7.53 - 7.89 V (range 0.36 V). By using the linear regression method, the characteristic equation V = 0.035 KP + 6.871 and correlation value are obtained equal to 0.985.

Keywords: Semi-cylindrical capacitor- voltage- starch content

Topic: Physics