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Liquid Level Sensors

Liquid Level SensorsDevice for measuring liquid level and converting it to an electrical signal to send to other instrumentation.

A liquid level sensor is an instrument for measuring the height of a liquid and converting it to an electrical signal which is sent to other instrumentation to display, monitor, log or control the liquid level.

There are many different types of technology use to measure liquid level, there are sensors that can be mounted above the liquid such as ultrasonic or radar which bounce a sound or electromagnetic wave off the surface of the liquid and use the travel time to determine the distance from the liquid surface.

For liquid filled tanks there are sensors which can be attached externally, such as floats running up and down a liquid filled tube connected at the bottom of the tank, or a pressure sensor installed in a hole in the bottom of the tank which measures the pressure generated by gravity acting on the liquid.

Another method is to lower a probe into the tank and immerse it in the liquid such as a capacitive probe which detects the changing capacitance charge as the length of the probe is exposed to varying proportions of liquid and air, or pressure sensors which measure the pressure generated by gravity acting on the surrounding liquid.

Contents

  • Product Types
  • Technology Comparison Table
  • Related Guides
  • Related Definitions
  • Related Tools

Product Types

  • External Mounted Tank Level Sensors
  • LMP307 Submersible Level Transmitter Water Level Transmitters with 4-20mA Output
  • ATEX Approved Liquid Level Sensors for Hazardous Areas
  • Sea, Brackish or Salt Water Submersible IP68 Depth & Level Sensors
  • Submersible Liquid Level Sensors
  • Diesel Fuel Tank Level Sensors
  • Waste Water Level Sensors
  • Low Range, Shallow Depth Liquid Level Sensors
  • Corrosive Chemical Compatible Flush Diaphragm Liquid Level Sensors
  • Flush Diaphragm Liquid Level Sensors
  • Intrinsically Safe Liquid Level Sensors
  • High Temperature Liquid Level Sensors
  • Submersible Diesel Tank Level Sensors
  • Plastic Submersible 4-20mA Liquid Level Sensors
  • Marine Approved Liquid Level Sensors
  • Marine Approved Submersible Liquid Level Sensors
  • Landfill Site Submersible Leachate Level Transmitters
  • Submersible Leachate Level Transmitters
  • Landfill Site Leachate Level Transmitters
  • Digital Submersible Liquid Level Sensors
  • HART® Liquid Level Transmitters
  • Detachable Cable Submersible Liquid Level Sensor Probes

Technology Comparison Table

Please use the table below to compare the advantages and disadvantages of each liquid level sensor technology type versus application and specification parameters.

Capacitive Hydrostatic Ultrasonic Radar
media contact yes yes no no
moving parts no yes no no
surface disturbance sensitive no no yes no
pressurised vessel yes more difficult yes yes
vacuum evacuated vessel yes more difficult no yes
installation position top side, bottom top top
thick fluids no yes with flush diaphragm yes yes
protrusion into tank yes no no no
sg density variation sensitive yes yes no no
fouling degrades performance yes yes no no
accuracy low high high high
cost high high high high

Related Guides

  • Determining water tank volume using hydrostatic pressure
  • Hydrostatic Pressure
  • Hydrostatic Liquid Level Sensors
  • How do you measure the volume of a liquid using pressure
  • Determining the hydrostatic pressure range for a tank level sensor
  • Calculating required pressure range for fuel tank level measurement
  • Using absolute pressure sensors to measure hydrostatic level
  • Converting non-vented depth readings & barometric pressure to true depth
  • Choosing PVC, PUR, FEP and TPE cable types
  • Stop sea water level or depth sensor failures due to pitting or corrosion
  • How to reduce submersible pressure sensor failures caused by moisture ingress
  • Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
  • How to determine milk tank level and volume from pressure
  • Are all IP68 Water Resistant Protection Ratings the same
  • Difference between vented and non-vented water level measurement
  • Measuring the volume of liquid in a horizontal cylinder tank
  • Using a screw-in or waterproof pressure transmitter to measure liquid level
  • Improve the electrical termination of vented submersible pressure sensors
  • How does changes in Local Gravity affect Hydrostatic Pressure
  • Considerations for monitoring Landfill Water Level
  • Why are Submersible applications so demanding of Pressure Transducers?
  • Liquid Level Measurement
  • Determining the Signal Cable Length of a Suspended Liquid Level Transducer

Related Definitions

  • Capacitive Fluid Level Measurement
  • cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
  • Conductive Fluid Level Detection
  • Float Fluid Level Detection
  • ftH2O – Feet of Water Column at 4 deg C Pressure Unit
  • mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
  • mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
  • Specific Gravity
  • Vibrating Tuning Fork Fluid Level Detection

Related Tools

  • Fluid Depth, Density, Gravity, and Pressure Calculator
  • Vertical Cylindrical Shaped Tank Contents Calculator
  • Horizontal Cylindrical Shaped Tank Contents Calculator
  • Rectangular Shaped Tank Contents Calculator
  • Pressure to Liquid Level Calculator
  • Liquid Depth/Level to Hydrostatic Pressure Calculator
  • Liquid Level Transmitter 4-20mA Current Output Calculator

Primary Sidebar

Liquid Level Sensor Specifier

Specify a liquid level sensor
Select your liquid level sensor requirements

Product Selection Guides

  • Data Loggers
  • Differential Pressure Sensors
  • Digital Pressure Gauges
  • Digital Pressure Sensors
  • Digital Readouts
  • Hydrostatic Liquid Level Sensors
  • Liquid Level Sensors
  • Millivolt Output Pressure Transducers
  • Pressure Transducers
  • Pressure Transmitters
  • Voltage Output Pressure Transducers

Product Enquiry

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