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Water Level Monitors
Last Updated on: Tuesday, April 01, 2014 04:30 AM


Circuits Designed by Dave Johnson, P.E. :
  • Electrodeless Water Level Monitor
    This system operates much like a classic float switch but without any moving parts.  The illustration shows how a system using two copper coils sealed inside a plastic pipe, can detect the level of water outside the pipe.  Whenever the water level is lower than the upper coil, no signal is coupled between the coils.  Once calibrated, this technique might also work on the outside of a plastic water tank.  (added 7/06)

  • Water Flowing in Pipe Indicator -- July 6, 2009
    The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezoelectric wafer.  The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra low power voltage comparator.   When the vibration signal has sufficient amplitude, a FET transistor switch is activated.  Drawing only 6uA, the whole circuit is powered by a lithium coin battery, which should power the circuit for many years....
  • WATER SEEPAGE ALARM
    This simple circuit sounds a beeper when its electrodes detect water. A single 1.5v N cell powers it. A small 1.5v button battery will also work.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

12vDC Sump Pump Control -  A simple control to turn on and off a 12v DC sump pump (like a boat bilge pump) as water level rises in the sump…. [Circuit Design by Burton Lang]
12-volt Cellar Drain Pump -  This circuit lets you control a pump, to keep the level of water in a cellar below a certain threshold, for example. Power is supplied to the pump by a battery that is recharged automatically when the AC powerline voltage is present…requires login to see circuit.... [Published in Elecktor July/August 2010]
15 Volt Toilet Tank Refiller -  (electronic diagram added 6/03)
AN1013: Gas & Water Metering with the PIC16F91X Family -  Microchip Application Note Published 20-Jan-06....[App Note]
Circuit checks "swamp-cooler" water level 10/31/02 EDN-Design Ideas....A "swamp cooler" is an easy way to obtain effective air conditioning, especially in hot and dry climates, if a water source is readily available. Although most units are very reliable, the storage-reservoir control usually uses a single level-detector component. Failure of this component can lead to serious water damage.... [Design Idea by Daniel Krones, Precision Design Services, Sky Forest, CA]
Circuit checks swamp cooler water level -  31-Oct-02 Issue of EDN  A "swamp cooler" is an easy way to obtain effective air conditioning, especially in hot and dry climates, if a water source is readily available. Although most units are very reliable, the storage-reservoir control usually uses a single level-detector component. Failure of this component can lead to serious water damage.... [Design Idea by Daniel Krones, Precision Design Services, Sky Forest, CA]
CMOS NAND gates control sump pump -  14-May-09 Issue of EDN  A similar circuit lets you control both the sump pump and the water level.... [Design Idea by V Gopalakrishnan, Indira Gandhi Center for Atomic Research, Kalpakkam, India]
Economical Pump Controller -  Having a reliable system to pump out a sump pit is essential as mistakes and failures can lead to serious flooding and enormous expense. In our article Sump Pump Control System we introduced a selection of electronic solutions to the following problems.... [REUK - Renewable Energy UK website]
Electrodeless Water Level Monitor -  This is an illustration how two coils inside a PVC pipe can be used to monitor the level of water in a tank.  Current induced into the water from the bottom coil is only detected by the upper coil, when it is under water. [Designed by David A. Johnson]
Float Switch Water Level Measurement -  Find out how to use float switches in renewable energy applications…. [REUK - Renewable Energy UK website]
Gas & Water Metering with the PIC16F91X Family -  Microchip Application Note Published 20-Jan-06....[App Note]
Hot Water Tank Indicator -  The idea for this project may have come to me in a flash of inspiration, and its a very simple way to check if a fuse has blown without removing it from its holder….(circuit / design added 8/03)
Infra-Red IR Beam Alarm/ Proximity Detector -  This circuit can be used as an Infrared beam barrier as well as a proximity detector.  The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules. For other modules please refer to their respective datasheets.  The receiver consists of a 555 timer IC working as an oscillator at....(added 11/06)
Infra-red Liquid Level Detector -  Useful for liquids level detection and proximity devices Up to50 cm. range, optional relay operation (added 4/05)
One wire bus powers water level sensor -  02/15/00 EDN-Design Ideas....remotely monitor the level of liquid water in a vessel such as a swimming pool.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Petrol/Diesel Level Sensor -  This sensor is particularly suitable for use in small spaces, such as the petrol tank of a motorbike. It has the advantage of not having any moving parts, unlike a conventional sensor with a float and float arm that make it difficult to fit in a tank….must register on this site.... [Published in Elecktor July/August 2010]
Piezo crystal monitors liquid level -  03/30/00 EDN-Design Ideas....The simple and inexpensive circuit in Figure 1 monitors the liquid level in a container. The piezo crystal, carefully mounted at the bottom surface of the container, receives it activation from the 74HCT14 hex Schmitt trigger. The….PDF contains multiple circuits, please scroll to find this one.... [Design Idea by J Jayapandian, IGCAR, Tamil Nadu, India]
Pump Controller -  Having a reliable system to pump out a sump pit is essential as mistakes and failures can lead to serious flooding and enormous expense. In our article Sump Pump Control System we introduced a selection of electronic solutions to the following problems.... [REUK - Renewable Energy UK website]
Simple Sump Pump Controller -  Put together a sump pump controller with two float switches and NO electronics…. [REUK - Renewable Energy UK website]
Simple Well Pump Controller -  Find out how to automatically get water from the well into a header tank…. [REUK - Renewable Energy UK website]
Sump Pump Controller - Every sump pump controller that I have seen on the web uses DC to sense the water.  This approach is simple, but eventually causes corrosion of he sensor probes due to the electrolysis.  The probes than have to be periodically cleaned or replaced.  This circuit solves the problem by using AC to sense the water in the sump....[Designed by Andrew R. Morris]
Sump Pump Controller -  Put together a sump pump controller with two float switches and NO electronics…. [REUK - Renewable Energy UK website]
Water Alarm -  The LM1830 fluid detector IC from National Semiconductor is designed to be able to detect the presence of fluids using a probe. This chip requires a relatively high supply voltage and is not the most frugal power consumer. It is also quite specialised so unless you are buying in bulk the one-off price is not cheap.….must register on this site.... [Published in Elecktor July/August 2010]
Water Drain Pump Controller -  A hole needs to be digged at the lowest place in the celler that have water incomming problems. The hole is about 0.5 x 0.5 x 0.5 meter, at the bottom a large water pump is mounted. Then the different water levels was measured, so we know how to make the sensors. ….(design added 11/08)
Water Flowing in Pipe Indicator -  The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezoelectric wafer.  The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra low power voltage comparator.   When the vibration signal has sufficient amplitude, a FET transistor switch is activated.  Drawing only 6uA, the whole circuit is powered by a lithium coin battery, which should power the circuit for many years.... [Designed by David A. Johnson]
Water Level Alarm -  A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level of water in a bath or cold storage tank.… [Andy Collison's website]
Water Level Control/Monitor -  A simple way to control the level of any liquid in any container. (electronic schematic added 05/04)
Water Level Indicator with alarm -  This circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when the tank is full.  The circuit uses the widely available CD4066, bilateral switch CMOS IC to indicate the water level through LEDs. When the water is empty the wires in the tank are open circuited and the 180K resistors pulls the switch(added 10/05) [Radioland.nt.au]
Water Level Reference Design -  The Water Level Reference design continuously monitors water level and water flow using the temperature compensated MPXM2010GS pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4, 8–pin microcontroller.  This system uses very few components, reducing the overall system cost. (app note added 3/05)
Water Pump Hysteresis Circuit -  A simple circuit to prevent a pump being damaged by being turned on and off rapidly (multiswitching)…. [REUK - Renewable Energy UK website]
Water Seepage Alarm -  This simple circuit sounds a beeper when its electrodes detect water. A single 1.5v N cell powers it. A small 1.5v button battery will also work. …. [Designed by David A. Johnson]
Water-level Alert -  Beeper or flashing LED alert.  (electronic design added 6/07)
Water-Level Controller -  ....
Water-level Indicator -  The whole project was developed on a friend's request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. ….(electronic schematic added 11/08)
Water-level Sensing & Control -  This is a simple but reliable circuit for your sump-pump, aquarium, boat, or whatever, but water only. Please be careful when working with 115Volt line voltage! Take every precaution to avoid electrical shock. Unplug the power before making changes or touching resistor R1. Murphy's Law applies to all of us!…. [Tony van Roon's circuit]
Waterpump Safety Guard for Fish-pond -  The circuit below was developed to guard the fish pond.  In this case to prevent that the pump sucks just air when the water level get below the pump.  When the water filters get saturated and dirty, the water level behind the filter gets to an unacceptable level.  You can see this when the pump also produces air bubbles in the water.... [Tony van Roon's circuit]
Well Pump Controller -  Find out how to automatically get water from the well into a header tank…. [REUK - Renewable Energy UK website]
Wireless Liquid Level Sensing for Restaurant Applications -  (circuit / schematic design added 6/06)
 
Water Level Monitors


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