||Controlled atmosphere storage is a technology that reduces the metabolic
reactions of fruits and, when properly applied, helps to maintain their freshness and
quality. This work describes the development and implementation of a system used to
regulate four atmosphere controlled chambers for conservation of cherries, variety Saco.
The data acquisition and control system uses a personal computer and a data acquisition
card connected to sensors and actuators installed in the chambers. The software was
developed using LabVIEW version 8.5 from National Instruments. The software has
friendly interface to input and/or access data, such as: set the sampling interval and setpoints,
among other variables. The user can specify different set-points for temperature
and gas concentrations as programmable events along time. The actuating signals for
cooling and gas concentration control are computed using incremental PID algorithms.