World's simplest " Automatic water level controller with high/low voltage cut off "( Tested OK)
This circuit has only few cheap components and very easy to assemble. This circuit is a modified version of my previous post for water level controller.Circuit can perform 4 operations as below
1) automatic switch on water pump when water level comes low in overhead tank
2) automatic switch off the pump when tank get full
3) Low voltage cut off protection for pump to a set voltage, say below 160 V
4) High voltage cut off protection for pump to a set voltage ,say above 250V
click circuit to enlarge
These all operations can be performed with this simple circuit. BC 547 will be always in ON condition, till the water level comes down to lower level. switching ON the 547, keeps 187 off condition. when water level lowers, 547 loses its base voltage and get off, results in switching ON 187 and relay connected to 187.Pump will switch off only when water rises to touch the tank upper probes.
If the voltage become low, while pump ON condition,187 loses its base voltage through zener and relay get cut off.
If the voltage become high,zener connected to 547 deliver base voltage to 547 . This condition switch ON 547 and ground the base of 187,resuting relay cut off.
Adjust the presets for the required cut off voltages. Relay contact Ampere rating is given as" x" in circuit because you have to choose a relay with contact ampere according to the pump HP.Only 3 wires are needed to overhead tank
HELLO VINNESH,
ReplyDeleteKINDLY CLEAR THE FOLLOWING DOUBTS .X RATED RELAY MEANS WHAT? MY MOTOR PUMP IS 1HP MONOBLOCK. FOR THAT WHAT TYPE RELAY TO USE?HOW MUCH THE COST FOR THIS CIRCUIT IN ANDHRAPRADESH?
VENKAT DOTTE
10 amp contact relay is better. I am not aware about the cost of the components in Andhra pradesh.In Maharashtra this components without relay will cost only 12 RUPEES. RELAY you can choose according to pump HP.
ReplyDeleteif you have additional motor starter unit, PCB mount relays can be used ,which is very cheap (14 rs to 25 rs max)
Dear Mr Vineesh ,,,i am sorry to say you that don't publish this type of foolish circuits.....what material you can put in the water?what about corrosion..what happend to the terminals if you connect it and run even for a week..what a simple circuit...Mr...
ReplyDeletedear anonymous,
ReplyDeleteif a circuit fails to work,then only a circuit can be a said as foolish circuit.corrosion is a fact for any water level controller circuit which use DC for water sensing. Corrosion can be reffered as only a disadvantage or draw back of all such circuits. aluminium or stainless steel can prevent corrosion for some extent. you have to clean the sensing probes after few months for removing deposit on sensor.You can see lot of water level circuits if browse in net which uses more complications even for for just controlling motor. This is VERY simple and with just 2 transistor and few other components it can function low volt cut off, high voltage cut of, lower level water sensing and switch on motor, upper level water sensing and switch off motor.
Thanks for sharing this great piece of information.Do keep us update with some more great articles.
ReplyDeleteLevel Controller
Thanks & most welcome
DeleteI read your post. It was amazing. Your thought process is wonderful. The way you tell about things is awesome. I always wait for your posts. They are inspiring and helpful. Thanks for sharing your information .
ReplyDeleteRemote Control Cooler
dear Anil kumar,
Deletemost welcome and thanks for your valuable comments. sorry for delay in posting my next circuits because of my job tight schedule.hopefully you can expect my next post soon.
Hi Vineesh,
ReplyDeleteI am Amol Mishra,the circuit you have designed is working very well. I came across your ciruit on Mr Swagatam maujumdar's blogspot. The article talks of an additional circuit that will be used to give ac supply to the sensors , so as to minimise the problem of depostion due to electrolysis.i am really eagar to use it in my water level controller.So kindly post it at the earliest, as the problem of cleaning the sensors is very irritating. If possible can you email the circuit diagram and details to misra_amol@rediffmail.com
Dear Amol,
ReplyDeleteyes there is an additional simple circuit of mine with AC sensing probes which can eliminate sensing probe wear out . I avoid that circuit section because, i sold the circuit concept to a small scale industry with some agreement closure, in which i cannot share or publish that circuit concept . sorry for that.BUT it is a simple concept and you can easily design yourself. Only clue i can give is, its based on the AC tester ,that we normally use in our house.
Thanks....
hey vineesh,
ReplyDeleteI have another basic doubt, excuse me if its silly :)
The 12V that you have mentioned is derived from mains right ??? i mean using transformer and 7812 ?
please correct me if i am wrong.
Rgds
yes , u can use any dc voltage source or transformer .current required is only 500 ma
ReplyDeleteDear Vineesh kodambattil,
ReplyDeleteI tried your circuit and the under voltage/over voltage portion is working properly omly when I changed the 10 k resistors by 1 ks. Further no water control sensors perform as described. Can you help me? I am an enthusiast/hobiest. But when
Glad to visit your blog. Thanks for great post that you share to us...
ReplyDeleteIts really wonderful and watchable. I like to share it with all my friends and hope they will definitely like it.
ReplyDelete