31-12-2010, 04:19 PM
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1. INTRODUCTION:
For the supply of water it is very common method to use an overhead tank to which water is pumped from a ground level tank. Generally a person has to manually switch on the water pump when the overhead tank is running low of water. Also when the tank is filled a person has to switch off the water pump manually. This process is inefficient because the person has no idea about the current water level in the tank. Therefore it cannot be known when the water is going to run out and when the tank is filled up, until the actual thing occurs. This may cause unexpected cut off of water supply. Also when the water is being pumped up the person has to wait until water overflows and then switch off the water pump. To improve this to certain extent sensors can be placed in the tank to measure the water level. Then the person can monitor the water level in the tank and can take necessary actions. In this system sensors are used to measure the water level in the tank and the water pumped is automatically switched on and switched off as required. This system minimizes human intervention and eliminates the inefficiencies described above.
1.1 REQUIREMENTS OF THE SYSTEM:
The system should minimize user intervention.
The water level of the overhead tank should be monitored using sensors and when water level drops below a threshold level the water pump should be turned on. When the level of water is above a predefined level the pump should be turned off.
When the pump is turned on the water level in the ground tank should be monitored. If that level drops a below a defined value the pump should be turned off.
A user should be able to disable the whole automatic system and switch on or switch off the pump manually.
A display system should be used to indicate the water level in the tanks. However for the convenience of the user the display system should not display the level of water in the overhead tank when the pump controlling system is operating in the automatic mode. Otherwise the user will become confused. In the automatic mode only the level of water in the ground level tank should be displayed.
Sometimes the levels of water in both the overhead tank and the ground level tank will be below their lower thresholds. At this situation the pump should not be turned on and the system should indicate that the water level is low in both the tanks.
In the manual mode the water level in both tanks should be displayed so that the user can operate the motor by observing the indications of the display.
CONCLUSION:
For the supply of water it is very common method to use an overhead tank to which water is pumped from a ground level tank. The controller is primarily used where water is stored in an underground tank & then lifted to an overhead tank. It automatically control water level of both the tanks. Auto starts the motor/pump when water in upper tank reaches low level provided water is available in lower tank. Auto switch off when upper tank becomes full or lower tank gets empty. It is suitable where water is stored in an underground tank & then lifted to an overhead tank. Automatically controls water level of both the tank simultaneously.
