Design and Development of Multi-point Online Monitoring System for Temperature & Relative Humidity around the TRIGA Mark-II Research Reactor

Abstract

The present paper describes the design and development of multi-point environmental temperature and relative humidity (T & %Rh) online monitoring system around the TRIGA Mark-II Research Reactor in Bangladesh. Microcontroller (ATmega32) based data acquisition system has been designed to collect the sensor data (SHT75) from seven different points around the reactor facility using the full duplex differential mode transmission technique (RS422). Each point is identified by its position address which is user selectable in the hardware. Multi-drop network (Daisy Chaining) data communication is used to transfer all the data to a PC located in the control room. RS422 to USB converter is also designed for PC Interfacing. The data acquisition unit has also the provision to use in stand-alone mode for easy calibration and portability. The second phase of the program also includes the area radioactivity monitoring which will be incorporated in the hardware. A graphical program for user interface is developed in LabVIEW to acquire the data and display them continuously on the computer monitor. Also this monitoring system provides data-logging facility which keeps record of the T & %Rh as numeric value in a log file and performs as backup for further analysis of the measurements.