Diseño e implementación de un sistema de pozo seco para calibrar circuitos de acondicionamiento de sensores de temperatura para el Laboratorio de Instrumentación Electrónica de la Escuela Politécnica Nacional

Abstract

The present work details the design and implementation of a dry well system that facilitates the calibration of conditioning circuits of temperature sensors, the system has a range of temperature variation between 0 ° C to 100 ° C and may be controlled by a local control and a remote control. The dry well calibration system creates a dry, closed and temperature controlled environment in which the sensor of the conditioning circuit to be calibrated will enter. In order to raise the temperature, heating resistances controlled by a PI control are used, while a cooling system controlled by an ON / OFF control with hysteresis has been used to decrease the variable. The local control allows you to enter the reference value using a keypad, a display allows the user to know the current system temperature and the reference value that has been entered. The remote control is done through a PC via USART serial communication, the PC HMI was developed in LabVIEW and allows entering the reference temperature and visualizing the temperature variation with respect to time.