31-07-2012, 02:26 PM
ADVANCED WATER LEVEL CONTROLLER
[attachment=29711]
INTRODUCTION
Our advanced water level controller is designed to automatic control of motor, which ensures constant reserve of water in storage tanks. Automatic water level controller is used to automatically fill the overhead tank as and when it gets empty and monitor the water level in it
Dry and water sensor:
This sensor is based on the fact that water is not pure water which is non conductor, but it is impure which is slightly conductor.
Water sensor is nothing but a series of very close PCB tracks. In normal mode these tracks are not conducting, but when some water fall on these tracks these line slightly start conducting and some positive voltage is available at the base of transistor So NPN transistor is on and NPN transistor provide a negative voltage as a pulse to the microcontroller
Level sensors
In Advance water level controller , conductive level sensors are used .
Conductive level sensors use a low-voltage, current-limited power source applied across separate electrodes. The power supply is matched to the conductivity of the liquid, with higher voltage versions designed to operate in less conductive (higher resistance) mediums. The power source frequently incorporates some aspect of control, such as high-low or alternating motor control.
A conductive liquid contacting both the longest probe (common) and a shorter probe (return) completes a conductive circuit. Conductive sensors are extremely safe because they use low voltages and currents. Since the current and voltage used is inherently small, for personal safty reasons.
[attachment=29711]
INTRODUCTION
Our advanced water level controller is designed to automatic control of motor, which ensures constant reserve of water in storage tanks. Automatic water level controller is used to automatically fill the overhead tank as and when it gets empty and monitor the water level in it
Dry and water sensor:
This sensor is based on the fact that water is not pure water which is non conductor, but it is impure which is slightly conductor.
Water sensor is nothing but a series of very close PCB tracks. In normal mode these tracks are not conducting, but when some water fall on these tracks these line slightly start conducting and some positive voltage is available at the base of transistor So NPN transistor is on and NPN transistor provide a negative voltage as a pulse to the microcontroller
Level sensors
In Advance water level controller , conductive level sensors are used .
Conductive level sensors use a low-voltage, current-limited power source applied across separate electrodes. The power supply is matched to the conductivity of the liquid, with higher voltage versions designed to operate in less conductive (higher resistance) mediums. The power source frequently incorporates some aspect of control, such as high-low or alternating motor control.
A conductive liquid contacting both the longest probe (common) and a shorter probe (return) completes a conductive circuit. Conductive sensors are extremely safe because they use low voltages and currents. Since the current and voltage used is inherently small, for personal safty reasons.