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Liquid Level Switches

Liquid Level SwitchesMeasurement and point detection devices for monitoring liquid level and activating switch contacts at predetermined liquid level thresholds.

A liquid level switch is an instrument for monitoring the height of a liquid and tripping a relay contact switch or transmitting a solid state relay switch output when a maximum, minimum or intermediate level has been reached. The liquid level switch output can then be utilised by other instrumentation to open a valve, illuminate an warning lamp, activate an audible alarm, or switch on/off a pump.

Liquid level measurement products
  • LMK458 Marine Approved Hydrostatic Level Transmitter
  • LMP305 Borehole Level Transmitter
  • DPT200 Pressurised Tank Level Differential Pressure Transmitter
  • External Mounted Tank Level Sensors

There are two basic types of liquid level switches, those that detect the presence of liquid known as point level detection, and those that are continuously monitoring the variation in level to detect when a threshold has been reached.

Point level switches have to be mounted so that the sensing probe makes contact with the fluid. They are simpler to set-up and calibrate, since the installation position dictates the switch point, however this also limits where the point level sensor can be installed.

There are many applications on a liquid storage tank where a switch provides a lower cost and simpler installation for managing tank contents because there is no need for additional signal conditioning instrumentation, and some switch types are mechanically activated and require no electrical supply or electronic circuits to function.

Liquid level measurement products
  • 3 metre range submersible freshwater level transmitter
  • Dockside sea water tide level transmitter up to 6 metres depth
  • LMK457 Marine Approved Level Transmitter
  • SLS-D SDI-12 Digital Interface Submersible Level Sensor

Contents

  • Product Type Comparison Table
  • Related Guides
  • Related Definitions
  • Related Tools

Product Type Comparison Table

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

float conductivity capacitive hydrostatic tuning fork ultrasonic
media contact yes yes yes yes yes no
moving parts yes no no yes yes no
surface disturbance
sensitive
no no no no no yes
pressurised vessel yes, low pressures yes yes more difficult yes yes
vacuum evacuated vessel yes yes yes more difficult yes no
installation position top, side, bottom top, side, bottom top side, bottom top, side, bottom top, side
thick fluids no no no yes with flush diaphragm no yes
protrusion into tank yes yes yes no yes no
sg density variation sensitive no no yes yes yes no
fouling degrades performance yes yes yes yes yes no
multiple point level detection vertical entry yes, side entry no vertical entry yes, side entry no yes yes vertical entry yes, side entry no top entry yes, side entry no
accuracy low low low high high high
cost low low high high high high
power supply required no yes yes yes yes yes
Liquid level measurement products
  • Fresh water compatible submersible 1mH2O range 4-20mA output pressure sensor
  • 50m seawater depth and temperature sensor with SDI-12
  • DPT200 Pressurised Tank Level Differential Pressure Transmitter
  • Dual input indicator to display & calculate the liquid level of a pressurised tank

Related Guides

  • Liquid Level Sensors
  • Determining water tank volume using hydrostatic pressure
  • Hydrostatic Pressure
  • How do you measure the volume of a liquid using pressure
  • Hydrostatic Liquid Level Sensors
  • 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
  • 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

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