Sistema de control de una cámara de presión en el laboratorio de metrología del INAMHI orientado a la tecnología IoT

Abstract

The objective of this technical work is to develop and implement a control system for a pressure/vacuum chamber for the INAMHI metrology laboratory dedicated to the calibration of barometric pressure sensors. The main characteristic of this system is the ease of communication between a person and a machine (HMI) thanks to its programming, thus solving specific needs of the laboratory and helping to improve its work. A variety of processes are included such as PID control, FLUKE RPM4 pressure acquisition, reading of sensors to be calibrated, remote HMI control, local data saving and broker publication. For the validation of the system it is necessary to rely on a specialized methodology in sensor calibrations. (ISO/IEC 17025 STANDARD) supported by national standardization bodies and representatives of the business sector, contains the general requirements for the competence of testing and calibration laboratories. This project guarantees accurate measurements of atmospheric pressure, however, when comparing the value of the set point and the value obtained there will always be a percentage of error due to the temperature, humidity and body heat of the person. Therefore, since there is no exact measurement, the standard deviation range was reduced between the range of 0.1 to 0.3, as well as the stabilization time in 2 minutes, these results allow obtaining quality, safety and high competitiveness, it also has IOT technology It helps to remotely monitor and save the historical data in the cloud.