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89C51 Based Petrochemical Level Indicator and Controller with Temperature Monitoring
89C51 Based Petrochemical Level Indicator and Controller with Temperature Monitoring
89C51 Based Petrochemical Level Indicator and Controller with Temperature Monitoring
89C51 Based Petrochemical Level Indicator and
Controller with Temperature Monitoring For Spinning /
Cotton Process Industries
Title of the project : Petrochemical Level Indicator and Controller
With Safety Measurements for Spinning /Cotton process Industries
Domain : Embedded Systems Design
Software : Embedded C, Keil, Proload
Microcontroller : AT89C51
Power Supply : +5V, 500mA Regulated Power Supply
Display : a) LCD b) LED
LCD : HD44780 16-character, 2-line (16X2)
LED : 5mm
Crystal : 11.0592MHz
Sensor : Reed Switch / Magnetic sensors
Applications : Spinning Mills, Cotton Process Industries
ABSTRACT:
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. During the process 390C temperature has to be maintained.
AUTOMATION:
If a system is developed for automation of pump for filling the container, no operator is required for supervising the system. Automatic water level controllers are already available in the market. But these controllers are not suitable for this application, as the electrodes are having direct contact with the content. As it is petrochemical based liquid, direct contact with electrodes is not acceptable. The sensors are fixed at specified locations on the container. A floating magnet floats on the liquid and triggers the magnetic sensors one-by-one based on the liquid level. Micro-controller monitors the liquid level and the level displayed on LCD.If the maximum level is reached, the micro-controller switches off the motor. If the liquid reaches the lower level, the controller drives the driver circuit and switches onthe motor. A thermistor is used as temperature sensor.
The micro-controller compares the temperature with a ref constant and if the temperature increases beyond 390C, the controller drives the siren circuit to alert the operator.
This project is specially designed for spinning / cotton process Industries. Direct contact of level probes with the content / liquid is completely avoided in this project. Magnetic sensors / Reed switches are used as level sensors. Thermistor is used as temperature sensor. The level of the content and its temperature is monitored by the micro-controller and displayed on LCD. Relay driver circuit can be activated by sensing “Level Full” and “Low Level” indicators and operates the motor automatically. Siren driver circuit would be activated by thermistor sensor.
As magnetic sensors / reed switches are used, the problem of oxidization of level probes is completely eliminated. This is an advanced, trouble-free, fit and forget system for industrial applications.
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.
