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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.

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.

Contents

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

Related Products

  • Capacitive Liquid Level Switches - Capacitive switches for opening or closing electrical contacts at a preset liquid level thresholds.
  • Conductivity Liquid Level Switches - Conductive devices for monitoring liquid level and opening and closing switch contacts at predetermined liquid level thresholds.
  • Ultrasonic Liquid Level Switches - Ultrasonic devices for monitoring liquid level and activating the opening and closing of switch contacts at predetermined liquid level thresholds.
  • Vibrating Tuning Fork Liquid Level Switches - Vibrating tuning fork devices for monitoring liquid level and activating switch contacts at predetermined liquid level thresholds.
  • Hydrostatic Liquid Level Switches - Hydrostatic pressure sensing switches for activating switch contacts at predetermined liquid level thresholds.
  • Float Liquid Level Switches - Float actuated devices for monitoring liquid level and activating switch contacts at predetermined liquid level thresholds.
  • WRAS approved water cooler float switch
  • DS200 Combined Hydrostatic Level Switch, Gauge and Sensor
  • Food grade 1 metre high range tank level switch & indicator

 

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

Related Help Pages

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

  • Using Hydrostatic Pressure Transducers for Measuring Fluid Level
  • Determining the hydrostatic pressure range for a tank level sensor
  • Liquid Level Sensors
  • 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
  • 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
  • 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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