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Liquid Level Sensors

Device 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

  • Related Products
  • Product Type Comparison Table
  • Related Help Pages

Related Products

  • Hydrostatic Level Sensors - Hydrostatic pressure sensing devices for measuring liquid level and converting it to an electrical signal to send to other instrumentation.
  • Waste Water Level Sensors - Waste water Level sensors with open face flush diaphragms for measuring the hydrostatic pressure of sewage and effluent waste. Select a level sensor for mounting inside or external to a tank or sewer pipe.
  • LMP307 Submersible Level Transmitter Water Level Transmitters with 4-20mA Output - 4 to 20 mA current loop output water level transmitters with a for use with process instrumentation for measuring the level of water in a water well, water reservoir, river or water storage tank.
  • Submersible Hydrostatic Level Sensors & Probes - Level sensors for submerging permanently in liquid to determine the level or depth of fluid by measuring the hydrostatic pressure.
  • 4-20mA Output Hydrostatic Level Transmitters & Sensors - Liquid level transmitters with a 4 to 20 milliamp current loop output signal for determining liquid depth or the fluid level by measuring the hydrostatic pressure.
  • Submersible Liquid Level Sensors - Devices protected from liquid ingress when completely immersed in a fluid for measuring liquid level and converting it to an electrical signal to send to other instrumentation.
  • Diesel Fuel Tank Level Sensors - Diesel fuel oil storage tank device for measuring diesel fuel level and converting it to an electrical signal to send to other instrumentation.
  • Submersible Diesel Tank Level Sensors - Diesel fuel oil storage tank device for measuring liquid level and converting it to an electrical signal to send to other instrumentation protected from diesel ingress when completely immersed in the fuel oil.
  • External Mounted Tank Level Sensors - External mounted level sensors for installing on the outside of a liquid storage tank to measure level of tank contents.
  • Chemical Resistant Hydrostatic Liquid Level & Pressure Sensors - Pressure transmitters & transducers that are resistant to chemical corrosion for measuring the hydrostatic level of storage tanks or process pressures.
  • Low Range, Shallow Depth Liquid Level Sensors - Level sensors for measuring very low liquid levels in shallow rivers, weirs, drains, sewers, streams and small tanks which are immersed or mounted on the outside of a tank.
  • ATEX Approved Liquid Level Sensors for Hazardous Areas - European hazardous area ATEX approved sensors for liquid level measurement in intrinsically safe installations on petrochemical, pharmaceutical, landfill and sewage treatment sites.
  • DMP331P Hygienic Flush Pressure Transmitter
  • LMK351 High Overpressure Flush Level Transmitter
  • ATM/N Titanium Submersible Hydrostatic Pressure Transmitter
  • 18.605 G Low Cost Submersible Diesel Fuel and Water Tank Level Sensor
  • DCL 551 RS485 Modbus RTU Submersible Low Range Fuel, Oil & Wastewater Level Probe
  • LMP305 Borehole Level Transmitter
  • LMK387 Cleanable Sewage and Sludge Pressure/Level Sensor
  • DCL 531 Modbus RTU RS 485 Submersible Stainless Steel Liquid Level Sensor
  • S12S SDI-12 Coms IP68 Pressure and Temperature Sensor
  • LMP307 Submersible Level Transmitter
  • LMK809 Plastic Submersible Low Level Transmitter
  • LMK458 Marine Approved Hydrostatic Level Transmitter
  • 2m tank height, high temperature oil level sensor with 4-20mA out
  • Measuring a 125 mm of water level range to 1mm accuracy
  • Underground rain water storage tank level sensor and readout for 2 metre depth
  • 200m deep well pump water level sensor, switch & display
  • Borewell water level sensor for 100m water height
  • Modbus RTU RS485 submersible borehole water level sensor
  • 6m range 4-20mA submersible animal feed tank level and PT100 sensor
  • 1 barg IS certified 4-20mA submersible leachate pressure sensor for tank level gauging use
  • Underwater 50 metre sea depth 4-20mA output sensor
  • Low cost 2 metre high diesel tank level sensor with 0-10 volt output
  • Beverage tank liquid level sensor for beer, wine, spirits or cider
  • 25m borehole submersible pump level indicator and control switch with level sensor

Product Type 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 Help Pages

Browse other help pages associated with the same topic group as this Liquid Level Sensor page.

  • Using Hydrostatic Pressure Transducers for Measuring Fluid Level
  • Determining the hydrostatic pressure range for a tank level sensor
  • Choosing PVC, PUR, FEP and TPE cable types
  • Using absolute pressure sensors to measure hydrostatic level
  • Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
  • Hydrostatic Liquid Level Sensors
  • Determining water tank volume using hydrostatic pressure
  • mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
  • How to determine milk tank level and volume from pressure
  • How do you measure the volume of a liquid using pressure
  • Are all IP68 Water Resistant Protection Ratings the same
  • Difference between vented and non-vented water level measurement
  • Calculating required pressure range for fuel tank level measurement
  • Measuring the volume of liquid in a horizontal cylinder tank
  • Specific Gravity
  • Hydrostatic Pressure
  • mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
  • ftH2O – Feet of Water Column at 4 deg C Pressure Unit
  • Using a screw-in or waterproof pressure transmitter to measure liquid level
  • cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
  • How to reduce submersible pressure sensor failures caused by moisture ingress
  • 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?
  • Converting non-vented depth readings & barometric pressure to true depth
  • Liquid Level Measurement
  • Liquid Level Switches
  • Float Fluid Level Detection
  • Vibrating Tuning Fork Fluid Level Detection
  • Conductive Fluid Level Detection
  • Capacitive Fluid Level Measurement
  • Determining the Signal Cable Length of a Suspended Liquid Level Transducer

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