# What is the best liquid level sensor [closed]

I need a sensor for measuring level of liquid in a tank. The method of measuring should be non contact type. Please give any suggestion. I want to interface the sensor with a microcontroller like STM32 or AVR.

Tank diameter is 2m and depth is 5m. The liquid inside is industrial coolant. Use will be indoors. Continuous measurements is needed and three switches are required to be activated depending upon the level.

I am interested in the following sensor. MB1000 LV-MaxSonar-EZ0 or MB1010 LV-MaxSonar-EZ1. Please suggest.

## closed as unclear what you're asking by Bimpelrekkie, Finbarr, PeterJ, Dave Tweed♦Apr 5 at 13:06

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• There are many possible types of sensors as even a rudimentary search will find. Not surprisingly, the optimum sensor will depend on the situation- the sensor for a water tank in an ultrasonic humidifier will likely be different from sensors used in a hydrocarbon tank farm. – Spehro Pefhany Apr 5 at 4:01
• What is the tank size , fluid and tank material? – Sunnyskyguy EE75 Apr 5 at 4:01
• You also need to specify if you are interested in continuous level measurement or if low/mid/high level sensors are enough. – Michael Karas Apr 5 at 4:07
• Down vote for the lack of important details and specific application scenario. – Michael Karas Apr 5 at 4:08
• Asking for "the best" is "silly". I could recommend the UltraGauger 2100 which has better specifications than all other sensors but if you have to ask what it costs you cannot afford it. Oh, I made this up just as an example, the UltraGauger 2100 does not exist. Saying that cost and accuracy need to be "moderate" is pointless, what is "moderate"? Google "level gauging" and see what you get. Normal prices are easily in the range of \$ 1000 or more for radar based gauges. – Bimpelrekkie Apr 5 at 6:12

The best solution always comes from the best specs;

 Budget
Accuracy
Environment
Fluid
Tank material and size


The main choices are;

1. Non-Contact Ultrasonic Sensors with temp. compensation and serial ports
2. PTFE coated Capacitance Level Sensors
• I am interested in ultrasonic solution.Cost and accuracy should be moderate. – Rhony Apr 5 at 4:43
• I need to know about maxbotics ultra sonic sensor. Any suggestions.. – Rhony Apr 5 at 4:45
• Tank material is concrete. – Rhony Apr 5 at 4:50
• I'm not a sensor salesman, do your homework – Sunnyskyguy EE75 Apr 5 at 5:34
• Don't forget to add drift. A glass of water with shaved ice has some nice initial accuracy on temperature. Of course, give it a day. It's definitely drifted some. Also, I can't count the number of times someone has come up with a fantastic idea, only to find that when tested in practice we find it's actually much better at detecting whether or not the building's air conditioner is on than it is for its design purpose. And then there's the question if this is liquid hydrogen or liquid boiling sulfuric acid to be measured. – jonk Apr 5 at 5:56

There are many types of sensor available with different principle, accuracy and precision & it can also work with microcontroller

You have to choose upon your requirement like budget, accuracy, power source,etc.

some of sensors are listed here..

Ultrasonic sensor good for hobby project and can work with AVR and also range up to 2m

water level sensor but not for long range

float switches , switch the NO to close or vice versa when required height of water is reached

and other are capacitance level sensor, infrared , multiple wire type etc.

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• please read fully code of conduct before making any comment @ElliotAlderson – Jay Vadoliya Apr 6 at 3:39
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