The 5 simple dry run protector circuits presented here shows simple methods by which insufficient water conditions inside an underground tank can be sensed without introducing probes inside the underground tank, and thus preventing any possibility of motor dry running. The circuit also incorporates an overhead water overflow control feature.
The idea was requested by one of the interested readers of this blog.
Technical Specifications
Do you have any idea of how to sense dry run motor by checking at the overhead tank inlet without checking at the underground tank since it takes more work in getting the wire from underground to motor place.
My requirement is motor should go off if no water is flowing at the tank inlet. Also motor should not off initially since it will take at least 5 seconds to push the water at the tank inlet.
My requirement is to switch off the motor when motor is not able to pump the water. This may be due to water level become less than certain threshold in the underground tank Or pump has malfunction.
My preference is not linking any wire from the underground tank to the circuit. My preference would be sensing the water flow in the overhead tank inlet. Hope you understood my requirement.
I would like to switch on the motor manually. If we replace the buzzer with a relay, then motor will be switched off immediately upon switching on motor,since it will few seconds for water to flow on the tank inlet.
We need to provide some time delay to sense the water flow at the tank inlet to avoid this problem. but I am not sure how to introduce a delay. Please help me on this.
Design #1
The circuit of the proposed underground water pump motor dry run protector can be understood with the help of the following details:
The circuit is powered with a 12V AC/DC adapter.
When the push-button is pressed momentarily, the BC547 transistor along with the BC557 relay driver stage is switched ON.
The 470uF capacitor and the 1M resistor forms a time delay network and locks the entire relay driver stage for some predetermined delay after the push button is released.
This delay interval can be adjusted by experimenting with the 470uF capacitor and/or the 1M resistor.
As soon as the relay activates, the motor is switched ON which instantly starts pulling water in the overhead tank.
The moment water inside the overhead tank pipe connects with its residual water, the submerged probe which is the positive probe gets linked with the probe that's introduced at the mouth of the pipe. This enables voltage from the lower probe to reach the base of the relevant BC547 transistor via the water, and the 1K resistor.
The above action now latches the relay driver stage such that even after the time delay lapses, the relay holds and sustains the operation.
Now the motor halts only under two conditions:
1) If the water level reaches the overflowing level of the overhead tank wherein the positive potential from the lower probe gets connected with the probe that's connected with the base of the upper BC547 transistor.
The condition switches ON the upper BC547 which instantly breaks the relay driver stage latch and the motor stops.
2) If the water inside the underground tank dries out, which obviously stops the water link inside the overhead tank pipe and breaks the relay driver latch.
An Automatic version of the above sump motor controller with dry run protection system may be witnessed below:
Using Logic Gates: Design #2
A fully automatic version can be also built using 6 NOT gates from the IC 4049 as shown below, this configuration can be expected to work much more accurately than the above transistorized version of the automatic underground submersible water pump dry run protection circuit.
Feedback from Mr. Prashant Zingade
Hello Swagatam,
How are you? Your Idea and logic are awesome. hats-off to you. I tried IC4049 version, It is working fine except one issue.(I done one modification base on your previous design and it is working now).
I am facing one issue in IC version like when we put it on auto mode, dry run function is not working. Please see attached simulated video file.
Case 1: I observe If water level reach below bottom level relay will on pump but it fail to sense dry run and pump will continue to on.
Case 2: In manual operation it works perfectly. Excuse for any typo.
Warm Regard
Prashant P Zingade
Solving the Circuit Problem
Hello Prashant,
Yes you are right.
To correct the situation we will need to connect the output of N6 to the base of the BC547 through a capacitor, you can try connecting a 10uF here.
Negative of the capacitor will go towards the base.
But the problem is, this operation will activate the system only once, and if water is not detected then the system will switch OFF the relay and remain switched OFF permanently until it is activated manually using the switch, and until the yellow sensor comes in contact with water yet again. Regards.
Update
Dry Run Protection for Motor Reed Switch: Design#3
The following diagram shows an effective dry run protection that can be added to the pump motor, in cases where water is unavailable in the tank and no water flows out from the pipe outlet.
Here the push-button is initially pressed to start the motor.
The 1000uF capacitor and the 56k resistor acts like a delay off timer and keeps the transistor switch ON even after the push button is released so that the motor keeps running for a few seconds.
During this time water can be expected to flow out from the pipe outlet, and this will fill up the small container introduced near the mouth of the hose pipe. This container can be seen having a float magnet and a reed switch relay arranged inside.
As soon as water starts filling inside the container the float magnet quickly rises at the top and reaches at a close proximity to the reed relay, latching it ON. The reed relay now feeds a positive voltage to the base of the transistor ensuring that the transistor gets latched up and keeps the motor running.
However in an absence of water, the reed relay feedback is unable to turn ON, which causes the motor to shut down once the delay OFF time elapses after the predetermined amount of delay.
Current Sensed Dry Run Protector Circuit: Design #4
In the above ideas the circuits mostly depend on detection of water which makes the designs a little outdated and cumbersome.
The following idea unlike the above depends on load sensing or current sensing for executing the dry run protection feature.Thus it is contactless, and does not rely on having a direct contact with the motor or water.
Here, the two transistors along with the associated components form a simple delay ON timer circuit. When SW1 is switched ON, the transistor T1 remains switched OFF because of C1 which initially grounds the base drive of T1 coming via R2, while C1 charges.
This keeps T2 switched ON and the relay also switches ON. The N/O of the relay switches ON the pump motor. Depending on the value of C2, the motor is allowed to run for sometime. In case there's no water, the motor runs unloaded with relatively low current passing through RX. Due to this RX is unable to develop sufficient potential across itself, which in turn keeps the opto-coupler LED switch OFF. This allows C1 to get charged fully unhindered during the stipulated period.
As soon as C1 is fully charged T1 switches ON, and this switches OFF T2 and also the relay. The motor is finally shut off protecting it from a dry run situation.
On the contrary suppose the motor gets the normal supply of water, and starts pumping it normally, this instantly loads the motor causing it to consume more current.
As per the calculated value of the resistor Rx, this develops sufficient voltage across it to switch ON the LED of the opto-coupler. Once the opto is activated C1 is inhibited from charging, and the delay ON timer is disabled. The relay now continues to supply the 220V to the motor allowing it to run as long as water is available.
Another Simple Motor Dry Run Protector Circuit: Design #5
Here;s yet another idea which explains a very simple overflow controller circuit which is able to implement and restrict overhead water overflow as well as dry running of the pump motor.
The idea was requested by Mr. S.R. Paranjape.
Technical Specifications
I came across your site while searching for Timer circuit. I am very surprised by seeing how much one individual can do!
I refer to your write up of Friday 20, 2012.
I have a similar problem. I have a designed a circuit, which appears to work on breadboard.I want to start pumping only if there is a need in upper tank and lower tank has enough water. Further if water in lower tank goes below certain level while pumping, the pumping should stop.
I am trying to find a way for satisfying my last condition.
I want to start this circuit manually and when the circuit stops pumping action, it should also nullify my start action. This will stop the total operation of filling the upper tank.
Somehow I feel that combination of two relays( outside the circuit) in ON/Off part of total project should work. I am unable to figure how so far.
The above drawing may express what I want.Project/circuit is powered by the outer source. The output(that is used to stop umping) from the circuit should open the outer source, which was activated manually.
I hope you will excuse me in taking this root to pose my problem. If you find merit in my problem, you are welcome to put it on your blog.
I am attaching the circuit that I have devised.
As an introduction to myself- I am senior person(age 75 years) and has taken this as hobby to use my time interestingly.I was Professor of Statistics, University of Pune.
I enjoy reading your projects.
Thanking you
S.R.Paranjape
.bmp)
The Design
I appreciate the effort from Mr. S.R. Paranjpe, however the above design may not be correct due to many different reasons.
The correct version is shown below (please click to enlarge), the circuit functioning may be understood with the help of the following points:
The point "L" is positioned at some desired point inside the lower tank, which determines the tanks lower water level at which the motor is in the permitted zone of operation.
The terminal "O" is fixed at the topmost level of the upper tank or the overhead tank at which the motor should halt and stop filling the upper tank.
The basic switch ON sensing is done by the central NPN transistor whose base is connected to point "L", while the switch OFF action is performed by the lower NPN transistor whose base is connected to point "O".
However the above operations cannot initiate until the water itself is supplied with a positive potential or voltage.
A push-button switch has been included as requested for facilitating the required manual start function.
On pressing the given push button momentarily, allows a positive potential to enter the tank water via the push button contacts.
Assuming the lower tank level to be above the point "L" allows the above voltage to reach the base of the central transistor via the water, which instantly triggers the central transistor into conduction.
This triggering of the central transistor switches ON the relay driver stage along with the the motor, and it also latches the relay driver transistor such that now even if the push button is released sustains the operation of the circuit and the motor.
In the above latched situation, the motor halts under two conditions: either the water level goes below the point "L" or if the water is pumped until the overhead tanks upper limit is reached, that is at point"O"
With the first condition, the voltage from the relay driver collector is inhibited from reaching point "L" breaking the latch and the motor operation.
With the second condition, the lower BC547 gets triggered and breaks the latch by grounding the central transistors base.
Thus the overhead water level controller circuit is allowed to remain operational only as long as the water level is at or above point "L" or is below point "O", and also, the initialization is solely dependent on the pressing of the given push button.
IC 555 Dry run protection circuit
The dry run protection can be added to an existing IC 555 based controller circuit, a shown below:
As long as the water is above the low level, pin#3 is also at low logic. This keeps the relay switch OFF, and also the BC557 remains active and powers the IC 555 circuit.
When the water level goes below the low level, the pin#3 goes high and activates the relay and the pump motor.
With pin#3 going high, the BC557 is inhibited from the required negative activation signal at it base. However it does not switch OFF immediately due to the presence of the 100uF capacitor.
While the 100uF capacitor delays the BC557 switch OFF time, the transistor continues powering the IC 555 and thus the relay also stays powered allowing the motor to operate.
Hopefully, if water is present the motor starts pumping water out, which in turn activates the sensor input connected with the blue wires to the base of BC557.
BC557 now gets biased through these sensor points and the water conduction.
The situation now latches the BC557 ON, regardless of the charge on the 100uF capacitor.
However, suppose water is unavailable to the motor. The 100uF delays the BC557 switch OFF time, and allows the motor to try the pumping process for sometime, may be 10 seconds. But eventually the charge in the 100uF capacitor elapses. This instantly switches OFF the BC557 and the power to the IC 55 circuit is cut off. The relay/pump is switched OFF executing the required dry run protection.
Hi sir 555 based dry run production circuit is not working sir …pls give me one good dryrun automatic circuit sir
Thank you
Raaman..
Hi Raaman, it will definitely work, you will have to check the various points around the two BC547 transistors to make it perfect. Please let me know what results are you getting, and you must check it manually on table first before implementing it for the motor dry run…
I hope you have made the following design:
Hi swagatam!
I want to automate my piston pump so that it only runs when there is muncipal water in the inlet of the pump. Problem is that all the water sensors I searched can sense air flow too that I dont want. So I request you to suggest me any suitable sensor or any other technique for sensing water in the inlet.
Thank you.
Hi Muhammad, you can try the concepts presented in this article:
https://www.homemade-circuits.com/municipal-water-supply-sensor-pump/
I think my bc557 is faulty .
Its not working properly when i trouble shoot it alone.
If i use a not gate at base of 547
Does 547 become 557 sir?
Or other transistor i can use?
yes, you can use two NPN to replicate a PNP
I tried 555 version with dry run
It succeed in automatic water level control but failed in dry run protection.
Also i dunt get why blue wire is connected to emitter.
It started the motor when its under low level but didnt close off due to dry run after many seconds.
This is my circuit
s://drive.google.com/file/d/11GqLNGhYXf1lImdgnhQI61tMT5amqtrG/view?usp=drivesdk
I have explained the working of the modification at the end of this post:
https://www.homemade-circuits.com/underground-water-pump-motor-dry-run/
You will have to optimize the part values to make the circuit run as per the explanation.
The blue wire is connected with the ground line, which is also the emitter line of the relay transistor
or you can try an external circuit like this:
https://www.homemade-circuits.com/wp-content/uploads/2019/06/dry-run.jpg
Can i also know the reason of diode at base of 557?sir
it’s to ensure that the capacitor discharges only through the transistor and not through IC pin3
Im sry for complaining again and again sir but can u tell me a way to remove 557 and use other devices instead of it sir. With much respect
If dry run cut off power to ic 55 , pin 3 wil become low and motor wil turn off too. And the base of 557 get required negative signal and it wil turn on the 557 again. So the 55ic will regain its power and give out high at pin3 and motor will turn on again. Like this, im thinking confusingly sir. Can u pls explain and correct me who lack too much knowledge and think confused?
With lots of respect sir
Ihope u can help me im troubling with this project for over 2weeks now
Yes that’s correct, I’ll have to redesign it then…
im thinking about using 547 with a NOT gate at ase instead of 557 sir
will it work sir
but i dunt know if it will work because i dunt know the purpose of 4148 sir
I’ll redesign it and let you know how to proceed…
here’s the revised design, and should work as intended..
https://www.homemade-circuits.com/wp-content/uploads/2019/08/dry-run.jpg
it was very nice to hav u helping me sir! This new revised circuit is also easy to understand and u also didnt use 557 as i proposed. Im vert greatful to u sir.
Sir as im not very familier with delays . May i know what i thought is right? Here’s wht i thought. The lower lvl water make pin 3 high . And tht charge capacitor. The capacitor only let current while charging.and during that time tht current make run the motor. After fully charge no more current and will turn off if there is no water at the water outlet. i hope its right sir
It’s my pleasure min!
Your assumption is absolutely correct. The circuit is supposed to work exactly in the same way!
Sir in this revised version may i know where 4148 prevents discharging to? Is it pin 3? Im thinking when it discharge it wil be to the direction from where it was charged. And tht is pin 3 . So is it ok to discharge to pin3 now ?sir
Hi min, the diode is not for discharging the capacitor, it’s to cut off the emitter voltage when the tank level reaches full level and the pin#3 become zero volt. Although the emitter would be well grounded through the capacitor even if the diode is not included, still for better accuracy I have included the diode.
Oh isee ! Sir
So when pin3 is zero it acts as a ground for emitter and the current from emitter will go to the ground and not go to other 547 to start the motor. Is tht it ?sir
Im going to test it tdy thank u so much sir
yes that’s right, however even if the diode link removed, the emitter would be still grounded through the capacitor due to opposite polarity of the capacitor, but adding the diode link makes it foolproof
Also,in my opinion sir, when water out let doesnt sense water, it will turn off the transistor. So there is no current from tht transistor but there may be a current from pin 3 to start the motor. But having a diode on tht path prevents it? Is tht also right? Sir
That’s correct, the only doubt is whether the trigger from the water will be strong enough to keep the relay ON or not
Dear Swagathem,
First i appreciate you for your simple desighn many of companies are produce commercially with micro controllers, but you provide us freely morover its working on first attempt.apprciate if you could provide whatsapp number or phone number.Also i have one quistion sir how long we can extend sensor wires?possible on first floor while unit on ground floor.Hope you will answer my quistion.Also need one buzzer activate while dry run .how to do?
Thank you Dear Sison,
Sorry, I discuss only from this commenting platform, I don’t use wattsapp for website queries.
You can extend the probes as much as you like, just make sure to add a small capacitor at the base/emitter of the sensor transistor, or across the gate input and ground, if a gate is used
Greetings…..
Sir,
When i assemble the circuit of 555 and 2nos bc148 circuit of water level controller with dryrun protection it work smoothly on breadboard.but unfortunately the dryrun not working when i assemble the circuit on pcb.But when i connect one 60kohm resistor between negative of electrolytic capacitor (470mfd)and powersupply negative on other end then work smoothly.i know this is not the proper method.why this happened?hope u will clear my doubt and do further modification also please give me a solution for false triggering too.there is no spilled flex on my pcb.its cleaned and dried.
Sisoncs, sorry , I cannot see any 470uF in the diagram? Can you please pin point the section.
Sir,
The revised circuit here with 555 ic and 2nos of bc547 trans.The 470mfd electrolytic capacitor is parrllel to 1n4148 diode.here is your link.
https://www.homemade-circuits.com/wp-content/uploads/2019/08/dry-run.jpg
Sisoncs, OK got it! The 60K or any high value resistor across the negative of the 470uF and ground line will facilitate proper discharge of the 470uF so that the next relay ON/OFF cycle can happen correctly. But I cannot see any role of this resistor with regards to dry run. Because the dry run is solely controlled by the current delivered by the BC547 emitter.
In design two any othet transistor i can use instead of tp122 sir?
I cant get tht transistor for now
you can try 8050 or 2N2222
In design 2 sensor points simply mean wire dipped in the water right? Not real sensors? Sir
yes, they are copper ends, tinned with solder.
design 2 diode are 4007 or 4148 ? Sir or both ok?
for relay 1N4007, rest all are 1N4148
s://drive.google.com/file/d/1-y1kFMk73NbmwzPP-0SEJCtEGz8U31Ky/view?usp=drivesdk
Sir i did automatic motor control with this 555Ic circuit? How can i modify this into dry run protection?
Kaung, You can try the following updated circuit:
https://www.homemade-circuits.com/wp-content/uploads/2019/08/automatic-water-lvl.jpg
Thank u for designing this circuit sir
Is it also a delayed circuit? Sir
Thanks Kaung, yes the dry run is with a slight delay.
For 5seconds delay what capacitance should i use?
100uF near the push button should give 5 second delay
Can i use other not gate ic in design 2?sir
yes will do!
in design 2 feed back i saw that he is facing one issue but it was solved making a modification
do i need to do tht modification or can i jus use yr circuit diagram? i want to know if u hav updated tht diagram to fix tht issue
with respect from this newbie sir thanks
Yes it has been updated…the 10uF near N6 output is the updated part
can i know the specific capacitance for design 2 ?
as im still a student in electronics i cant estimate it
and i hav tried transistor version but not working may be due to my lack of knowledge or transistors malfunctioning.
so im going to try design 2 . so can i know cx written there to make a delay of 5second
For a newcomer it can be a complex circuit, so I’ll recommend building it stage-wise, initially keep the N5, and N6 stages aloof and disconnected. Once the central N1—N4 latch is confirmed then go for the N5 stage, and then finally the N6 stage.
For 5 seconds you can try a 470uF capacitor…or 220uF might also work…calculating accurately can be difficult, trial and error method is the quickest.
sir
only ic 4049 is recommended ? or can i use other not gate ICs?
Any NOT gate IC will work
I need a dry run protection system for a submersible deep well pump that works by sensing the flow of water through the outlet pipe of the pump. I mean to say the circuit should be based on flow-sensor, and turns the pump off as soon as it detects that the flow of water has stopped. I do not want the system to be based on level sensors or probes. I simply need to turn the pump off when the flow sensor that is installed at any point on the outlet pipe of the pump, senses that there is no flow.
You can try the following concept:
https://www.homemade-circuits.com/municipal-water-supply-sensor-pump/
ignore the probe and the connections.
use a small motor with propellers as the flow sensors, connect the motor wires across the 1K end and ground line of the circuit
after turning the pump on, the water takes few seconds to start flowing through the pipe. how would the transistor TIP122 be in ON state during that time? also, can you tell any other way, besides using a small motor with propellers, to sense the flow of water?
a reed and magnet arrangement can be used instead of motor,I will try to update the drawing soon.
ok. also please tell how the transistor would be in ON state at pump startup
I have updated the diagram in the above article
I have just come across this site with these circuits and wonder if you can help me….. I have a similar requirement.
I need a circuit to prevent a submersible bore pump (1100W) running dry, ie exhausting its water supply. I need the pump to shut off when the water level reaches about 1M above the pump intake, and start up again when the water level reaches about 3M above the intake. The pump body at earth potential would provide the common reference. The probes and associated wiring to the surface are already in place at those distances.
Any help you can give would be much appreciated. I can build circuits but just do not have the knowledge to figure the actual circuitry out. Many thanks in anticipation.
I’ll design it soon for you and let you know….
I have posted the idea at the bottom of this post
https://homemade-circuits.com/how-to-make-simple-water-level/
Dear Sir,
Please check your mail, I implemented that IC circuit and mail photos in the given ID, Please have a look sir and tell me the corrections.
Thanks & Best Regards
P G Ragavandir
Dear Ragavan, that would be impossible to check and implement…you must do it stage wise….first build only N3/N4, by connecting the associated parts along with the relay driver and the push switch stage.
once this is confirmed then go for the other gates one after the other and test them with sample water inside a cup…
so it has to be done in this way….and preferably do it on a veroboard not on bread board, because breadboard can be to messy and difficult to troubleshoot the connections.
Dear Sir,
Thanks for your reply, will do as you said sir
Best Regards
PG Ragavandir
Yesterday I build and install transistor based circuit. I am facing some issue. When water touch to wire (or Sensor) water pump misbehaving, it stop and start constantly (In short fluctuate constantly), also my mother notice that pump start and stop automatically. Please advise.
for the transistor version you will have to understand each stage and troubleshoot it yourself, it would be impossible for me to do it from here since there are many stages which may need careful adjustments.
by the way in the above comments you said you wanted to build the IC version and you also said you wanted star/stop type of control for your motor, so I am a little confused.
Thanks for you comment.
Can I try to increase value to cap of BC547(used to break latch/ used In OHT)
Just few day before I saw IC version. Previously I was working on transistor version, It is done now. I will try for IC version and let you know if any issue.
Can I have your Email ID ? so that I can share circuit diagram from which I created PCB
I'm taking about first circuit diagram. 3 transistor used.
OK but you cannot control a start/stop contactor box using the first circuit?
my email is
admin
@homemade-circuits.com
if you increase the timing capacitor that might affect the dry run protection in case water is not available….because with increased delay the motor would keep operating for longer period of time before switching OFF
One quick question. Can we use IC version with submersible pump. If yes then how , what are changes need to be done.
Submersible control unit have RED and GREEN button. Green use to start pump and red used to stop. In such case where to fit circuit.
I have answered your question, please refer to the previous comment….
Thanks, I will try this.
Its regarding IC version.
If it is fully Automatic(i mean to say pump will when water level go below low level and stop at high level) then why push button is used.
Correct me if I am wrong.
the push button start is an added feature which allows the user to start the motor anytime he wants, without depending on the lower level detection.
One more quick question. How this IC version to be used in submersible pump. (There is stop and start button on board)
for start stop contactor operations, you may have to employ the following concept
https://homemade-circuits.com/2015/09/automatic-submersible-pump-contactor.html
or the following
https://homemade-circuits.com/2015/09/borewell-motor-pump-starter-controller.html
I am talking about IC version.
1)What is value of cap connected to emitter of BC547 (OR positioned to left of N3).
2)Please correct me if im reading circuit wrongly . From circuit diagram I think N1 and N2 (pin 1 &2), N3 and N4 (Pin 3 & 4) connected to each other ?Right
the cap value is for the delay effect when the push button is used…it will need to be experimented, it could be around 22uF to 47uF
input of one gate is connected with the output of the other gate for N1/N2, N3/N4
Dear sir,
Thanks for your reply, I tried doing first and second circuit but I failed, so only I asked you for bread board model. (I can understand you will be busy sir so only I requested if possible.) I Will try sir. So kind of you sir.
Best Regards
PG Ragavandir
Thanks Ragavan, it is your learning phase, so you may have to go through some failures, all do…I am sure soon you will be able to overcome the failures and begin succeeding with the projects. all the best to you
Dear Sir,
Thanks for your positive words and faith on me.
Soon will overcome sir.
Thanks & Best Regards
PG Ragavandir
my Email-ID is vijayragavandir@gmail.com
Thank you Ragavan, Wish you too a Very Happy New Year!!
I am sorry due to lack of time practical guidance may not be possible, however if you any specific queries I can help you to solve it here
Dear Sir,
Wish you a very HAPPY NEW YEAR sir, Stay happy always……
Sir if possible can you please give this circuit with fully assembled in Bread Board ( practically) please, as I'm beginner I can understand in that easily.
Thanks & Best Regards
PG Ragavandir
Sir,Thank you for your reply, I am waiting for you to send the IC version circuit soon.
sure…It might take a little time so kindly bear with me…
I have updated it in the article, you can check it out
Sir,Fully Automatic version circuit is not working,i tryed 11 times on 6 boards,if any modification in this circuit please tell me sir,How to solve it? Thank you
Dimu, it will not work unless you confirm and optimize each stage separately on table using sample water in a small container to simulate tank water,and then integrate each of the stages one by one for the final outcome….
Since it is a transistorized circuit it might be be little inefficient and require some serious tweaking to make it work perfectly…..
if possible I'll try to update an IC version of the same which will not require much adjustments and can be made to function quickly…
Sir
I have seen the blog "An Automatic version of sump motor controller with dry run protection system" in https://homemade-circuits.com/2013/07/underground-water-pump-motor-dry-run.html
Can we put a switch in the circuit to run motor at any time in manual mode (water may not reach low level) and auto stop motor when tank is full.
Hope you understand & Thanks
Pls. reply: amarendra_co@yahoo.com
Amarendra, you will have to momentraily cut the 12V supply which goes to the upper tank in order to initiate the motor…this can be done by a push-to-OFF kind of switch connected in series with this 12V line.
but please note that this circuit will need to be perfectly optimized in order to make it respond to the various water linked sensors…otherwise you may find it difficult to get the expedited resulst from it.
check carefully, you will find it at extreme left of the design
sir
what if the same motor is used for irrigation ie there is no any overhead tank and a rubber pipe is inserted in water pump mouth then how to detect if motor is running dry or not
Rahul, you will need to place the sensor probes at the mouth of the pump pipe….as long as water is coming out from here, the circuit will stay switched ON, but the moment the pump stops throwing water, the pump will be switched off….preventing its dry run
I tried on simulator software. It start on push button. But it is not stoping replay when water touch to probe.
Any advise or troubleshooting?
Also if possible I will upload simulator video on YouTube and share link.
which probes are you referring to?
the one which is at the left just under the overhead tap is for latching the relay…..the latch will continue to hold until the water has filled upto the brim of the tank and until the right side probe comes in contact with water, then the latch will break.
on the other hand in absence of water the relay will not be able to hold for more than a few seconds and the latch will break due to no water reaching the left side probes, and the motor will be stopped …
this is how the dry run protection is implemented.
Yes I got you. Latch is break even after water touch brim of tank .
If I'm not wrong top most bc547 will break latch. But in my case it is not breaking latch.
when the tank becomes full, the positive supply comes in contact with the upper BC547 base, that triggers the BC547 and this in turn grounds the lower BC547 base…causing the relay to deactivate. this situation stops the motor and breaks the latch by stopping the water flow to the tank
the simulation is simple and will work only if the water bridging across the sensor points are good.
you can try a Dralington pair for the upper BC547 to increase its sensitivity.
Hi Sir,
Can you plz guide me. I wish to installing this circuit in my house automatic water level controller containing NE555 & CD4049 (simple water level controller) I wish to combine this circuit. would it work? And how to install its probes in OHT.
I'll try to help you…
you'll need to fabricate the probes as shown in the diagram..
Hello sir, i'm an electronics hobbyist. sir can u pls suggest me, In this same circuit, how to add the connection like if the water in the over head tank is low, the motor have to start automatically. that means i need it to works as fullyautomatic pls send the circuit diagram to my id. login2vamsi183@gmail.com. awaiting for ur needful reply. thank u…
Hello Vamsi, you can make the following circuit:
https://homemade-circuits.com/2011/12/how-to-make-simple-water-level.html
and try connecting its relay contacts in parallel with the above circuit's relay contacts.
Dear sir,
i tried as u said. the differences of both the above given circuit is its sensors are connected to OHT. and which you said circuit is for, the sensors to connect to under ground tank. but actually what i need is., to the same above given circuit can you pls design with automatically starting also…THANKS
Dear Vamsi,
this circuit is fully automatic and is exactly as required by you:
https://homemade-circuits.com/2015/09/automatic-submersible-pump-contactor.html
Dear sir,
in the same above circuit all i need is to work as fully automatic. the above design is semi automatic (manual start and auto cut off with dry dun) But can u pls design with adding auto start feature..? because our sump ( under ground tank ) is completely closed and tiled. and can not drop the sensors in it. so i think the above design is better putting sensors in OHT.so, kindly can u pls modify as per the request….
THANK YOU.
Dear Vamsi, I'll try to do it, and let you know….
Dear Sir,
Thanks for the response again. i'm sorry that i confused u. the design u posted for the bore well is very useful to me. but my request is the above circuit also for my sump motor purpose. so the modification i need about it like to work as fully automatic.thanks.
Dear Vamsi, yes I understand, thanks, I'll try to do it soon..
…please check out the new diagram
Dear Sir,
Thank you very much. i'll always be in touch with u regularly to discuss about more circuits designs..ill be back again after i prepared the circuit. THANK YOU VERY MUCH again.
sir,
what are the codes of three diodes 1N4007…? or IN4148 Zener…..? in the given new diagram.
You are welcome, Vamsi
for the relay it's 1N4007, remaining can be all 1N4148
dear sir,
the above given new circuit is also not working. as the same way i connected all the components through marking and checking thoroughly. can please check practically, or shell i change any values in the circuit…? Thanks..
Dear Vamsi, just by connecting everything correctly will not necessarily make a circuit work. It might require many adjustments and tweaking.
all these circuits are for those who know electronics very well and have plenty of practical experience.
so you'll have to first learn how the transistors are supposed to functions, then build and confirm the stages step wise and only then finally you may be able to finish it successfully…it could be many long tutorial sessions for you….
Thanks for the reply Sir……:)
Hello sir, my name is vamsi. can u pls suggest me, In this same circuit, how to add the connection like if the water in the over head tank is low, the motor have to start automatically that means i need it to work as Fully automatic.can u pls send me the circuit diagram. my id. login2vamsi183@gmail.com.
Is here a possibility to eliminate the 557 pnp as the relay driver and to make use of buffer of bc 547 ??
use two BC547 in Darlington mode and connect the relay in place of the collector 10k, this will allow you to remove the BC557 and its base resistor.
Hello sir,
I am Harun, Sir i want a automatic water level controller circuit for submersible / underground pumps use. Please send the circuit at: harunuvtsvharun@gmail.com
Hello Harun, one example circuit is already presented in the above page, if you have any other specifications please provide a detailed explanation for the same.
Hi sir
that circuit what is the minimum distance between from circuit to tank
Hi siddu, it shouldn't be too long not more than 5 meters.
Am in first floor. the tank is on 4th floor. so the distance betweent the probes in the tank and the circuit in my floor is 15-18 meters. wil the circuit work correctly???
you will need to place the circuit right beside the tank, otherwise it could create problems and incorrect results.
Hello sir, In this same circuite, how to add the connection like if the water in the OHT is low means the motor have to start automatically? pls send the circuit diagram to my id. sriramsrikp@gmail.com
Sriram, if possible i'll surely send it to you.
that means either your transistor is faulty, the connections are wrong or could be some other fault.
3v zener will prevent leakage current from entering the base of BC547 until it exceeds 3v which can never happen unless a legitimate 3v is applied.
no pull-down resistor is required.
that's highly unlikely, unless there's something leaking into the base of the BC547.
you can try the following:
remove the capacitor entirely and then check….or alternatively connect the emitter of the BC547 through a 3V zener diode. anode will connect with ground and cathode with the emitter.
Hi Prabir,
Building it could be a lot time consuming and expensive, I would suggest that you buy LED strip or LED ribbon light of different colors and power them from any AC to DC adapter, that would be quick and simple.
you can see the image here:
http://www.sabson-led.com/v/vspfiles/assets/images/led-strip-lights.jpg
Hi sir
plz send me the circuit diagram of water activated relay 12 volt
plzzzz help sir
my email id – gadgetidea@gmail.com
thnks
SOON
I have suggested the easiest possible method, 555 will be a complex circuit.
Thanks Soon,
You can make a relay driver circuit as shown in the following link (with some modification), and use the transistor base resistor free end and the positive supply as the two sensors placed just at the brim of the tank. The two terminals must not touch each other rather put close by such that they get bridged by the water just before over flowing, this will instantly activate the relay
https://homemade-circuits.com/2012/01/how-to-make-relay-driver-stage-in.html
The base resistor can be a 1K.
Remember to use a Darlington paired transistors (two BC547 put in Darington form)
Hi Swagatam
I Follow Ur blog last 6 month and i like
I request u can u make a Water activated relay with 12 volt dc and 12 volt relay
Simple when tank full the relay activated
The probe which is submerged at the bottom can be put next to the probe situated near the pipe outlet, this will rectify all issues.
Furthermore a 100uf capacitor may be added across base of BC557 and positive for avoiding relay break under interrupted water flow conditions from the pipe.
water produces a high resistance to voltage, so no chance of any short circuit.
You are welcome! I have updated the data, please check it.