Ultrasonic Water Level Sensor

This page introduces using water level detection solution in a water tank using ultrasonic sensor.

Ultrasonic water level sensors

Ultrasonic sensor (similar to radar and sonar) is using acoustic means for detecting an object’s distance away from the sensor. Just like a bat, the sensor will generate an acoustic pulse. The radiated pulse will hit the targetted object and reflected back to the sensor. The time taken for the pulse to echo back to the sensor provides an estimation of a distance. Knowing that the speed of sound is constant (in an acoustic medium) the detected distance can be relatively consistent.

Features For Water Level Detection

Sensing Distance

Sensing distance for water tank application typically ranges from 1 to 5 meters. If further detection distance is required, the sensor will need more energy and a bigger acoustic surface to emit and receive the ultrasonic pulse. This means the ultrasonic sensor for water level detection is usually bigger in size.

The increase in sensing distance also affects the sensing speed (sensing frequency). For water level detection, detection speed usually is not an important issue.

  • Sensing distance typically (1 to 5m)
  • Dead-zone (0.2 to 0.6m)

An ultrasonic sensor is typically designed for a certain detection range for a specific application. This helps to eliminate the possible noise being reflected from the environment. This is especially noise within a confined space like a water tank. The trade-off for a robust ultrasonic sensor will result in a slower detection speed. Dead-zone is the near range region which the ultrasonic sensor cannot detect. It is a blind spot to the sensor.

Output Type

There are many types of output to choose from. A benefit of using ultrasonic sensor is its ability to measure the relatively distance or water level in a water tank. For this reason, most of the time we want an ultrasonic sensor that can provide us with an analogue output or is able to output digital data. An analogue output provides distance information for our water tank level application.

  • Analogue output (0-10V, 4-20mA)
  • Digital data. (example RS232, RS485)
  • Electromechanical relay output (dry contact, normally opened, normally closed)
  • NPN, Open Collector output

Relay (dry contact) or NPN output can only provide simple on/off information. It can only tell you if the water level is reached or not.

Power Supply Input

There are typically two types of power input (either DC or AC voltage) to the sensor. It is recommended to select an ultrasonic sensor using DC voltage supply for a water tank application. If water gets in contact with the DC power will only result in minor water/gas reaction.

High voltage 230Vac power touching the water can be a safety hazard. If using DC powered ultrasonic sensor is not a solution, you should earth the water or water tank as a protection. In case the power line touching the water, the electrical system will be tripped and shut down as a means of protection.

  • 12Vdc or 24Vdc
  • 230Vac

Product Housing

For normal water tank application, you can just use a normal ultrasonic sensor. If you are using the sensor under a stressful environment, you may like to consider getting a sensor that can withstand water or even chemical resistant.

  • Waterproof (IP65, IP67)
  • Chemical resistant
  • Robust from microbial contamination

Teflon coating can protect the transducer from most types of chemical. For bio-sensitive labs or production line hygiene, you may even want to use stainless steel ultrasonic sensor (very smooth and polished surface) that can minimise the risk of microbial contamination.

Other Features

The installation location of an ultrasonic sensor can be sensitive. This is especially for installation within a water tank where multiple acoustic reflections can occur. It is best to install away from the wall. The narrow acoustic beam can also help to reduce the unwanted reflection.

  • Easy to mount and deploy.
  • Simple to configure.
  • Programmable.
  • Status and indicators.

Chemical Resistant Ultrasonic Water Level Sensor

QT50ULBQ

Chemical resistant water level ultrasonic sensor     logo banner

Click here for more information about QT50ULBQ.

Features:

  • Sensing distance from 0.2 to 8m (resolution 1mm)
  • Analog Output (0-10Vdc or 4-20 mA)
  • Power Supply 13-30Vdc (40-100mA)
  • Waterproof IP67, NEMA 6P rating
  • Operating Temperature -20 to 70°C
  • Housing Material PBT (Polybutylene terephthalate)

High-Resolution Ultrasonic Water Level Sensor

BUS M30M1-XC-60/600-S92K

High resolution analogue output water level sensor     logo Balluff

Click here for more information about BUS M30M1-XC-60/600-S92K.

Features:

  • Sensing distance from 0.6 to 8m (resolution <0.18mm)
  • Analog Output (0-10Vdc or 4-20 mA)
  • Power Supply 9-30Vdc (max 80mA)
  • Waterproof IP67
  • Operating Temperature -25 to 70°C
  • Housing Material Nickel Plated Brass, PBTTPU, PU foamEpoxy resinGlass
  • Fastening Nut M30x1.5

Ultrasonic Range Finder Water Level Detection

MaxBotix specialised in precision range-finder ultrasonic sensor which can be used for water level detection. Wide selection of ultrasonic products to choose from.

MaxBotix logo

Ultrasonic range finder sensor for water level detection

 

 

Other Ultrasonic Sensor References

Other Types of Water Tank Level Sensor

Water Level Float Switch Sensor

A float switch is a simple switching device which gets triggered when it is being lifted by the water/liquid. The float is designed to be less dense than the liquid, allowing it to float up when in contact with the liquid.

Float switch requires maintenance once in a while. For a liquid that is too dense, or sticky, it is not advisable to use a float switch. You may like to consider using an ultrasonic water level sensor instead. An

Common Application

  • Automatic replenish water tank
  • Fish tank water cycling
  • Rain-water tank and drainage control system
  • Water reservoir or Ponds
  • Tracking water drainage system

Magnetic Float Switch

Products from   Cynergy3 logo     Gems Sensors & Controls logo

Vertical

stainless steel float switch (vertical)         stainless steel float switch (vertical)

Horizontal

stainless steel float switch (horizontal)     plastic float switch (horizontal)

Please click on the images to the respective product links.

A magnetic float switch is one of the most popular float switches in the market. It is simple and easy to install. The sensor has a minimum number of moving mechanical parts compare to other float switches, which means the probability of sensor failure is lesser.

The magnetic float switch uses a reed which is typically very small in size. The floating compartment is inserted with a small and strong NEO magnet. When the magnet is close to the reed switch, the switch will make a contact (activate short circuit).

The entire sensor can be small in size and light in weight because of the small component used.

  • Small in size
  • Small dry contact relay
  • Come in plastic or stainless steel material

If the liquid in the water tank requires cleanliness or hygiene, there are stainless steel water level float switch available. For simple water tank application, a plastic version is good enough. If you do not want the sensor to be in contact with the sensor for potential contamination happening, you may like to consider using an ultrasonic water level sensor instead.

One disadvantage of this magnetic float switch is that you cannot use the switch itself to drive a high current load. The most current you can drive through this sensor is probably about 100 to 300mA. If you need to drive a high current device using this sensor switch, you will need to interface it with an additional relay.

Reference:

Mechanical Ball Float Switch

A mechanical ball float switch consists of a weighted ball and a micro switch built inside the housing. When the water level reaches the sensor, the sensor will start to float upwards. This upward position will roll the ball downwards with the help of gravity. When the ball rolled down, it will trigger and depressed the microswitch inside the sensor housing.

Mechanical Ball flow switch    Omega logo

  • Switch can conduct higher current
  • Bigger in size
  • Suitable to be used in a large tank or big ponds/rivers.

The sensor is usually bigger in size due to its trigger mechanism. The micro switch is bigger in size and is able to drive a higher current load (small motor) without using external relay interface.

Due to its dangling wire design, the sensor need not be secure at the required water level height. This is unlike the magnetic sensor as introduced earlier. This sensor can be pivoted to the side or bottom of the pond. When the water level reaches the height, the sensor will float up and the micro switch (dry contact) will be triggered.

Bilge Pump Float Switch

This is a bilge pump float switch which is a commonly used water sensor inside a boat yacht. Float water inside the boat hull will trigger this sensor. The sensor will run a bilge motor to pump the trapped water out of the boat/yacht into the open sea.

This bilge pump is specially designed for the marine industry. The material used in this sensor resist better under in a corrosive sea environment.

bilge pump float switch     Academy Sport Outdoor logo

More Water Lever Sensors

There are many different types of water level sensors technologies available in the market.

For an overview of many other sensors technologies in a table, click to visit the water level sensors comparison page.

You can also check out the water level sensors for other technical details.

 

Compare Rain Sensor Products

This page presents a quick summary comparison between the various type of rain sensors available on the market.

For a detail of the various rain sensing technology, you can visit the rain sensor page.

Comparison between the Rain Sensors

The following is a summary of the various types of rain sensors that are discussed on this web page for a quick comparison.

Rain Sensor Types Optical Resistive Capacitive Mechanical Sound Weather Sensor
optical rain sensor Somfy Rain Sensor capcitive rain sensor Rain Bird Mechanical Rain Sensor Switch Rain detector using sound Diffraction Limited boltwood cloud sensor
Features
Cheap X X X X
Reliability X  
Durable X  
Maintenance Free X X X X
Fast Detection X
No Need Power Supply X X X X X
Do not Collect Water X
Simple to Install X   X X
Simple to Interface with Other Systems X   X
Relay Contact Output (Dry Contact) X X
No Direct Contact with Water X X X X
Adjustable Sensitivity X X X
Multiple Mode of Functions X X X
Wide Range of Supply Voltage 9 to 24Vdc
or Vac
X 12Vdc Not Applicable
X 24Vdc

For Outdoor Rain Detection

For general purpose outdoor rain detection, consider the optical rain sensor. It is simple to maintain, and have relatively long lifespan compare to the other form of rain detection.

rain sensor Available from PIC-CONTROL.

This optical rain sensor accepts 12-24Vdc and has a dry contact relay output which allows you to interface an automatic awning shade motorised system, or an alarm and alert system.

Check out this page for more information on this rain sensor.

To buy this rain sensor, click here.

For Protection of Sensitive Equipment

For expensive equipment sensitive to rain water, consider using a high-end weather sensor. This weather sensor is able to accurately predict the rain even before the rain starts falling. Built-in with infra-red, humidity, wind and temperature sensor. It is a must have sensor for protecting expensive outdoor equipment.

Diffraction Limited boltwood cloud sensor     diffraction limited logo

This rain sensor is superior compared to the rest of the sensors. The disadvantage of this sensor is the price. The integration to other system is not too difficult, but you may need an electronic engineer for the interfacing work if you are not formerly trained.

For Rain Water Detection without Power

Select a mechanical rain sensor if you prefer a simple 2 wire switch to be activated when the rain water is detected. The sensor requires no power input. It is a switch contact (dry contact) which will be activated when there is water in the sensor.

The sensor will need about half a day to a day to dry and deactivate itself. A simple and inexpensive rain sensor to have if you do not need a very fast rain sensing response.

Rain Bird Mechanical Rain Sensor SwitchRain Bird Logo

Click here to purchase rainbird sensor.

For Budget Rain-Sensing

Cheap Rain Sensor DIY Kit <S$30

The resistive rain sensor is the cheapest of out. For temporary use or deployment, it can be a cost effective solution. Price starts from a few dollar to at most less than $30.

This resistive rain sensor available at Sim Lim Tower in Singapore.

Other Better Resistive Rain Sensors

Somfy Rain SensorLockwood Elevation Rain Sensor, wall mount

Click here for more resistive rain sensor available in the market.

More Rain Sensor Information

Check out more of the rain sensor products details from our rain sensor page.
rain sensor comparison table

Resistive Rain Sensor Products

This page provides a summary list of resistive rain sensor available on the market. You can buy these products online from Singapore.

If you are looking for more other types of rain sensors (using non-resistive technology), you can check out this other page.

You can also check out this page for a quick glance comparing rain sensors technologies available on the market.

Somfy Rain Sensor

Somfy Rain Sensorsomfy logo

Input power: 230Vac.

The output is dry contact relay.

Buy Somfy rain sensor

Kemo Rain Sensor

Kemo M152 Rain SensorKemo logo

Power Input: 12Vdc (160mA)
Output: Relay: 25V, 2A
Dimension Size: 65 x 45 x 36mm (sensor surface 29 x 30mm)
Anti freeze heater on the sensor. Indicator for operation and rain detection.

Where to buy? Click here or here.

FAKRO Z-Wave Rain Sensor ZRD

Fakro Z-wave rain sensor

Lockwood (ASSA ABLOY)

Lockwood Elevation Rain Sensor, wall mountLockwood logo

Power Input: 24-32 Vdc (300mA)
Operating Temperature: 0° to +60°C
Dimension Size: 60 x 50 x 16mm

Eltako Electronic Rain Detector Sensor

multi sensor rain sensorEltako Electronics Sensor

Rain, Temperature, Wind, Brightness sensor

Power Input: 24Vdc (6W)
Operating Temperature: -30° to +55°C (IP44)
Dimension Size: 118 x 96 x 77mm
Accessories available for wireless data transmitter FWS61

LW100 LEAF WETNESS / RAIN SENSOR

LW100 rain sensorGlobal Water logo

Power Input: 12Vdc (1mA)
Output: 0 – 5 Vdc
Dimension Size: 7.6 x 14mm
Accessories available for wireless data transmitter FWS61

HomeMatic Wireless Rain Sensor

HomeMatic Wireless Rain Sensor eQ-3 logo

Power Input: 7.5 – 30Vdc (250mA)
Operating Temperature: -20° to +55°C (IP44)
Dimension Size: 80 x 82 x 55mm
Weight: 266g
Build-in heater

Loxone Rain Sensor

loxone resistive rain sensorLOXONE logo

Power Input: 24Vdc (50 – 180mA)
Output: 24V
Operating Temperature: -30° to +70°C (IP65)
Dimension Size: 70 x 62 x 37mm

Velux Rain Sensor

Velux Rain SensorVELUX logo

Rain Sensor from eibmarkt

Peha D 940 RS regen rain sensor

DIY Rain Sensor

This is the cheapest rain sensor kit that you can purchase from the retail shops at Sim Lim Tower in Singapore for less than S$30. Simple and good education kit for learning electronics.

Cheap Rain Sensor DIY Kit <S$30

For those who like to build yourself a rain sensor, you can also check out the rain sensor open source design here.

Custom Rain Sensor Solution

PIC-CONTROL is providing custom rain sensor solution to our client.

Check out our rain sensor alert system or rain sensor awning automation shade system for further information.

Also, check out other rain sensor technologies and comparison between the rain sensors.

Compare Water Level Sensor

The following presents a comparison summary between the various type of water level detection methods. Each has its own advantages and disadvantages.

The subsequent sections talks about the commonly used sensors in the industries.

Technology Float Switch
(magnetic)
Ultrasonic
(acoustic)
Laser

Hydrostatic
(pressure)

Optical Capacitive

Electrode
(Resistive)

Image/Video RF/ Microwave
(Radar)
Features                  
No Water Contact X X X
Non-Electric Contact X X
Suitable for Most Types of Liquid X X X X
Simple to Install X X X X
Simple Water Tank Design X X X
Little Maintainence X X X X
No corrosion/ degrade over time X X X
Analog Output X X X X
Digital Output (npn) X
Dry Contact Output
Wide Water Level Depth X X X X
Low Energy Consumption X X X X
 Low Cost    X X   X       XX  X

images reference from:

 

Lowest Cost Water Level Sensor

The magnetic float switch is a widely used as a water level detection sensor. It is simple and is mechanically driven. The float switch consists of a float, magnet and a reed switch which are fairly inexpensive.

The reed switch which will be activated when the magnet is near. The activated reed switch will form a dry contact which indicates that a water level is reached.

The disadvantage of a float switch is that it has to be in contact with the liquid in order to function. For this reason, high-density liquid will not be suitable (one example is thick oil). The float switch also comes with a stainless steel version instead of plastic.

The sensor is rather reliable due to its simple mechanism. It is also a recommended secondary sensor to install for safety purpose even if you are using other methods of water detection.

A magnetic float switch is a simple and reliable.

Check out this page for more information about the float switch as a water level sensing.

Water Level Sensor with Analog Output

The ultrasonic sensor (acoustic sensor) is suitable for applications that require the detection of the water level depth in a tank or the amount of water in the water tank. The water level detected has a higher resolution. This wide water level detection range is also known as a water level sensor with “analog output”.

Check out this page for more detailed information about selecting a ultrasonic sensor for water tank level detection application.

Water Level Sensor Suitable for your Application

There are many types of water level sensors technology available. Each has its own advantages and disadvantages.

Feel free to contact PIC-CONTROL if you are unsure which water level sensing technology is suitable for your application.

Reference:

Sensors Data Logging

Data logging system design for sensors monitoring and test data recording. PIC-CONTROL can custom design a logging system specifically for your business use.

Sensor data logging system. Custom Design.

Sensor Data Logging Features

  • Type of Sensor Interface
  • Data Log Interface
  • Time-stamp of Data Logged
  • Power Supply

Type of Sensor Interface

There are many types of sensor connection interface.

  • Voltage ranges 0-3.3Vdc, 0-5Vdc, 0-10Vdc
  • Current interface 4mA to 20mA (Old standard, but still commonly used)
  • Digital communication interface, I2C, SPI, USART, RS232, RS485, Ethernet
  • Wheatstone Bridge

Data Log Interface

There are a number of data interfaces to choose from. It depends on your application.

Data collecting using a memory card is suitable for a standalone application where you want to leave the system to do the measurement or monitoring. You can collect the data at a later time, and open the file with your Microsoft Excel or OpenOffice Calc software for manual data analysis. The logged data can be presented with a timestamp for your archive. The amount of data collected will depend on the data being logged, the memory size of the storage and the time frequency of each data sample.

For an application that requires real-time data collection or real-time data analytic, you should consider using Ethernet communication line. Ethernet communication system is also more efficient when you are collecting from a number of sensors deployed to various different location.

  • microSD memory card
  • USB Thumb Drive
  • Harddisk
  • Cloud Server, Webserver data storage
  • Ethernet communication network
  • Wireless WiFi, Bluetooth, XBee
  • USB
  • RS232, RS485

Wireless sensors and equipment for monitoring weight. Sensors’ data are being transmitted via the internet for data logging to the cloud server.

XBee wireless sensors collecting data and sending them to the internet cloud.     Weight sensor monitoring through the internet WebService.

Timestamp of Data Logged

Date and time logging is typically necessary for analytic. This is also known as the data timestamp. This is especially useful for fast changing sensor data. Data logged can be archived for future reference.

Power Supply

The recommended method of powering up the data logging system is to use the wall mains 230Vac power supply.

For outdoor data collection, you may like to have your data logging system plugged to your vehicle for power or have it powered up from a battery.

A logger system can have the battery built in. There is a limit to how much power a battery can supply. For longer data collection usage, a large size battery will be needed. It usually means more bulky and heavy. There will be a charging function to charge up the built-in rechargeable battery.

Sensor Storage

Built case for storing sensitive equipment and dedicated sensors. Neat and protect against wear and tear.

Easy storage for your equipment and sensors

Custom Data Logging System

Email PIC-CONTROL today for your custom sensor data logging system. We are able to design and custom built the system for your business. Custom built set starts from S$2500 and above.

Rain Detection & Alert Notification System

Rain detection alert and notification system

Rain Detection (Alert Notification Process)

  1. The Rain Sensor that is installed outdoor detects raining.
  2. The indoor rain signage gets illuminated to indicate that it is currently raining outside.
  3. An alarm sounds to alert nearby personnel.
  4. Personnel can push the mute button to acknowledge the alert.
  5. The alarm can be muted, but the rain signage is still illuminated as long as it is still raining.
  6. Rain signage will be turned off when the raining activity is stopped for about 2 or 10 mins.
  7. The buzzer will not sound off again if the rain is stopped for less than 30 minutes.

Optional Features for Rain Detection System

Email Alert Notification

  • Email alert notification.

SMS Notification System

  • Option SMS alert using online cloud services.
    • Cheaper than traditional monthly SMS subscription sim card.
    • No need SMS modem or SMS sim card.
    • Requires SMS cloud service subscription.
    • Requires internet connection.

Wireless Connectivity

  • Wireless connectivity over 300-500m (in open space).

Rain Detection for Outdoor Premises or Activities

Rain sensor can be used to enhance the safety of outdoor activities. Outdoor play area can be deactivated when rain is detected to discourage children from their playing activities.

Rain detection for safe outdoor water play area activities.

Custom Rain Sensor Automated System

The rain sensor system can also be integrated directly with automated awning shade system, automated gate, door or window system.

It can also be used as a sensor to alert or halt outdoor aqua playground system to protect children from dangerous activities when the weather is bad.

Check out this page for more information about this wet weather rain sensor.

Contact PIC-CONTROL for further information on your automated rain sensor control system today.

Contact our sales for further information for a custom rain detection alert system.

Water Level Detector Electrode System

Water Level Detector Relay Board

Water Level Detector System

water level detector system panel

This is the distribution box for the water level detector system using electrode sensor, design and built by Hong Lam Engineering Pte. Ltd. .

The system consists of a total of 8 electrode sensor for 2 water tank. Each tank has electrode sensors of 4x different length to detect the water level.

When the water is too low, a water pump can be activated to transfer water to/from the tank. An emergency sensor is also position to prevent the water level being too high which can result is water overflow damage. The water level system is completely automated through the electrode sensors and pumps system.

The water level system is also wired up with indicators to alert the user. Remote monitoring can also be implemented so that the status can be monitored from a central control room.

The electronic control boards can be wired accordingly for your own water level control.

Contact Hong Lam Engineering to buy this water level detection system.

 

Click here if you are looking for other types of water level sensors for your project.

Wiring Diagram for Electrode Water Level Detector System

water level detector wiring diagram

Water Level Detector Control Boards – for Sale

The water level detector system consist of 3x electronic circuit boards which provides the automation control. They are namely,

  • Flow Switch & Auto Change-Over Relay Board
  • Water Level Detector Relay Board
  • Water Level Electrode Sensor Board

Flow Switch & Auto Change-Over Relay Board

water flow switch control relay board

The water flow switch board detects the water flow and will activate the system accordingly.

Water Level Detector Relay Board

water level detector relay board

The water level detector relay board consist of 8 relays. Each is activated by the connected electrode sensors that are detecting the water level. When a water level is detected, the relay will be active, hence allowing the system to activate pumps, motor, etc… or alarm to alert the user.

The interface is simple to understand and the wiring is easy to connect.

Water Level Electrode Sensor Board

water level electrode sensor board

The water level electrode sensor board, connects up the 8 electrode sensor. 4 electrode sensors will be used for each water tank. The 4 electrode length will be at their respective water level, each indicating the following staus,

  • common
  • low water level cut-off
  • restart level
  • emergency level

 

Clearance Sales !!!     (for a Limited Time Period Only)

Buy Your Water Level Detector System Now

Flow Switch & Auto Change-Over Relay Board

click on the picture to view larger image.

Stock Qty: 96

Flow Switch & Auto Change-Over Relay Board with cable connector

Flow Switch & Auto Change-Over Relay Board

Water Level Detector Relay Board

click on the picture to view larger image.

Stock Qty: 191

Water Level Detector Relay Board

Water Level Detector Relay Board connector     Water Level Detector Relay Board, high voltage

Water Level Electrode Sensor Board

click on the picture to view larger image.

Stock Qty: 163

Water Level Electrode Sensor Board with cable connector

Water Level Electrode Sensor Board     Water Level Electrode Sensor Board

 

For purchase of this water level detection system or further information on the installation,
please contact Hong Lam Engineering Pte. Ltd (Your Specialized Pump Contractor).

Price will be discussed.

Also check out the other sensor electrodes, pumps and accessories product and services offering at their website (http://hlameng.com).

Hong Lam Engineering

 

Click here to explore more water level sensors and technologies.

Water Level Sensor

This page provides a short write-up of the various types of water level detection sensor available. You can click on the individual links which provide a more detailed description of the particular water level sensor, or you can visit the compare page to have an overview comparison of the water level sensors.

Type of Water Level Sensor

Electrode Water Level Sensor

eletrode sensor holder from Omron

Water Level Electrode Sensor Holder from Omron.

$120. (holder for water sensing rod)

Water level detector control panel for sale

Fully automated water level control system for water tank. Electronic control circuit board for electrode water level sensing.

Click here to check out this low-cost electrode water level detection system available for sale at a from Hong Lam Engineering Pte. Ltd.

For more information about an electrode water level sensor, click here.

Optical Infrared Water Level Sensor

Optical water level sensor work with the principle of light refraction. Light is internally reflected. When in contact with water, the light ray gets refracted out of the sensor. The reduce light intensity through internal reflection indicates the presence of water, hence water level is detected.

The sensor is usually mounted on the side of the tank to detect water level. Water is required to be in contact with the sensor in order for the sensor to work.

Optical IR Water SensorOptical IR Optical Sensor (Stainless Steel)

http://www.fluidswitch.com/blog/how-do-optical-level-sensors-work/

Datasheet: water sensor for water level detection.pdf (filesize: 1.3MB)

Ultrasonic Water Level Sensor

Ultrasonic water level sensor works by emitting a sound wave pulse and listen to the reflected wave (like how a bat detects its surrounding). The time it takes for the reflected sound wave to return determines the water level.

The sensor is usually mounted on the top of a water tank, with the emitter facing downwards. The water surface will reflect the emitted wave back to the sensor. If the sound wave takes a longer time to return, the water level is low. A shorter time for the reflected wave indicates a higher water level in the tank.

The advantage of using an ultrasonic sensor for water level detection is because the sensor has no contact with the water or any other liquid in the tank. There is also no need for any drilling or installation on the water container tank.

Ultrasonic Water Level Sensor

http://www.fluidswitch.com/blog/pros-cons-ultrasonic-level-sensors/

Check out further information on using the ultrasonic sensor for water tank level detection application.

Float Switch Water Level Sensor (magnet)

A float switch is a simple and cheap way to implement a flow level detection system. The switch is activated by a float which will get lifted up by the water. This float switch sensor is sealed and waterproof. The lifted float contains a magnet will then activate a reed switch on the wiring end. The activated switch can then be used to trigger or stop motor pumps.

If you need to have a multiple water level indicator, you will need to install more than one of this float switch. This sensor can only sense the water level when the water reaches the level where the sensor is installed.

Float switch water level sensor (Stainless Steel)Float switch water level sensor

http://www.fluidswitch.com/horizontal-float-switches.php

On the market, there is also a newer advance water level float switch sensor. The working principle is similar, except that this single float sensor contains multiple switch point depending on the water level.

You can detect multiple float level using only on of this advance float switch, which allows you to implement an automatic water level control system, without having to install multiple sensors.

multi level float switch water level detector

http://www.kari-finn.fi/index.php/En/products/float-switches/pintakytkimen-valinta-en

***Check out this page for more information on using a float switch for detecting the water level in a water tank.

Capacitive Water Level Sensor

Capacitive water level sensor works by detecting the change in capacitance on the surface of the sensor. This allows the sensor to be mount outside of the water tank or pipe, without having to be in contact with the water.

capacitive water level sensor

https://www.ia.omron.com/products/family/475/

capacitive water level sensor     capacitive water level sensor

http://www.gemssensors.com/Level/Single-Point-Level-Switches/Capacitive

Selecting a Suitable Water Level Sensor

You can also check out this water level sensor comparison table to help you select a suitable sensor for your water level detection system design.

Flood Water Level Sensor Solution

For a custom water level solution for your water tank or water detection system, you can send in your enquiry to PIC-CONTROL.