LONG RANGE LIQUID LEVEL MEASUREMENT IN CHEMICAL INDUSTRIES
In spinning mills Petrochemical based cleaning solutions are used for cleaning of raw cotton. This petrochemical liquid is pumped from tank to the process container by using an AC motor. The process container is the capacity of 2000 liters. The motor takes more than one hour to fill the process container. An operator has to pay attention to the container to switch off the motor to avoid overflow of petrochemical.
This project provides the best solution for this application by using ultrasonic sensors. The sensor is fixed at top of the container. Microcontroller continuously monitors the liquid level and this level will be displayed on LCD. If the maximum level is reached, the microcontroller automatically switches off the motor. If the liquid reaches the lower level, the controller drives the driver circuit and switches on the motor.
Relay driver circuit can be activated by sensing “Level Full” and “Low Level” indicators and operates the motor automatically. As ultrasonic sensors are used, the problem of oxidization of level probes is completely eliminated.
This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.
SOFTWARE AND HARDWARE TOOLS:
- Keil compiler
- ULTROSNIC SENSOR