Perancangan dan Implementasi Sistem Kendali Suhu untuk Sistem Bioreaktor

In this study a temperature controlled system (TCS) has been developed and applied to Bioreactor System. The bioreactor system has a glass column filled by algae biomass as adsorbent material for heavy metal ions. The purpose controlled keeps the inner temperature of glass column in a suitable value for adsorption process. The TCS for Bioreactor system consist of ATMEGA 8535 microcontroller, LM35DZ temperature sensor, and LCD 2x16. The temperature controlled system is set to produce the result 10, 20, 27, 30, 40, and 50 centigrade. TCS for Bioreactor system is formed by controlling refrigerator, heater and fan system. Furthermore, the results of temperature controlled system were analyzed for their performance. The change voltage Vac of current detector resistor Rd as used current-Iac change. Vac as an analogue signal converted to a digital data by ADC (Analog To Digital Converter), and then this data converted again by VCO (Voltage Controlled Oscillator) that developed by microcontroller into frequency which varying follow the change Vac