A. Surachman, A. Suhendi, M. Budiman, M. Abdullah, and Khairurrijal^*)

Physics of Electronic Materials Research Division

Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Jalan Ganesa 10, Bandung 40132, Indonesia

*) Corresponding author. E-mail address: krijal@fi.itb.ac.id

Received date : 27 April 2010

Accepted date : 29 Mei 2010

Abstract

A current loop receiver system based on a microcontroller has been developed. The current loop receiver system can serve 8 gas sensors with 4-20 mA outputs, which are handled by employing a multiplexer. The data acquisition of the system is composed of a common operational amplifier-based current loop receiver, a CD4051 multiplexer, an ADS7822 serial analog to digital converter (ADC), and an AT89S52 microcontroller. The measured gas concentration is displayed on the 7-segments or transmitted to a personal computer via the RS232 serial communication to be processed by the Microsoft Excel. Additional functions such as gas concentration level warning and error code display are also provided.

Keywords: 4-20 mA, Current loop, Microcontroller, Receiver, Transmitter

Paper lengkap dapat dibaca di tautan berikut  http://journal.engineering.or.id/joki