Liquid Tank Level and Temperature Monitoring System with PLC and HMI

Chow, Chee Yuen (2023) Liquid Tank Level and Temperature Monitoring System with PLC and HMI. Final Year Project (Other), Tunku Abdul Rahman University College.

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Abstract

In the past, people would stand at the highest point of the liquid tank to observe and monitor the liquid level in the tank. Different industries are using different types of sensors to monitor the liquid level of their tanks. Some things that can be measured using sensors are the level of liquid in a tank and the current temperature of the liquid. These sensors will collect environmental data via an electrical signal and then transmit the information to a controller. The controller gets information from the sensor and then tells the monitor what to do. The monitor shows the liquid level and temperature of the tank. This project is about building a system that can monitor a liquid tank. It uses ultrasonic sensors, a thermocouple, a Programmable Logic Controller (PLC), and a Human Machine Interface (HMI). The ultrasonic sensors will be used to measure the level of liquid in the tank. The ultrasonic sensors will send a signal to the PLC when the liquid in the tank is high enough. The PLC will be able to control the amount of water flowing into the tank based on the liquid level detected by sensors. The inlet water pumps can be activated/deactivated by turning on/off the respective relays. In addition, the condition of the liquid tank will be displayed on the HMI screen so that the current user can know the conditions of the liquid tank