Hydrostatic pressure sensing devices for measuring liquid level and converting it to an electrical signal to send to other instrumentation.
Hydrostatic level sensors for measuring the pressure generated by a static head of liquid. Use hydrostatic level sensors to measure fluid level in storage tanks, processing vessels, header tanks, pump inlet head and other applications where hydrostatic pressure is used to determine liquid height.
Products
- DCL 531 Modbus RTU RS 485 Submersible Stainless Steel Liquid Level Sensor - Digital submersible stainless steel liquid level sensor with a Modbus RTU protocol RS 485 serial bus interface.
- LMP307 Submersible Level Transmitter - Submersible level transmitter for measuring liquid level with a 4-20mA current loop or a 0-10V voltage output plus optional ATEX approval for intrinsically safe use in hazardous areas in ranges from 1mH2O up to 250mH2O. The LMP307 is suitable for use on potable water with no leaching, and can be supplied with a drinking water certificate according to DVGW and KTW.
- LMK809 Plastic Submersible Low Level Transmitter
- LMK382 Low Range IP68 Waste Water Level Transmitter
- LMK458 Marine Approved Hydrostatic Level Transmitter
- LMK331 Screw-In Ceramic Level Transmitter
Applications
- Borewell water level sensor for 100m water height - Low cost solution to measuring the water level in a borewell with a water height of as much as 100 metres above the submerged sensor
- 200m deep well pump water level sensor, switch & display - We need to measure the water level in a well down to 200 meters to protect a well pump by ensuring that it always stays under water
- Dirty water, sludge & sewerage tank level 400 mbar pressure sensor
- Contaminated groundwater submersible plastic body 5 psi pressure transducer & display
- 2m range 0.6% conc. chlorine liquid level sensor
- Hot leachate level transmitter for 20m deep well monitoring on landfill sites
- 50m seawater depth and temperature sensor with SDI-12
- 2 metre deep diesel tank level sensor for submersion
- Submersible oil pressure sensor alternative to Ashdown CNS
- Low cost 2 metre high diesel tank level sensor with 0-10 volt output
- 2 meters of freshwater depth, submersible pressure transmitter
- Diesel exhaust fluid tank level sensor for fleet storage
Product Types
- 0-10 Volts Output Hydrostatic Sensors, Probes & Transducers - Analog output hydrostatic sensors with a 0 to 10 volt amplified output signal for measuring liquid head pressure or fluid level.
- 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.
- 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.
- Water Resistant Pressure Sensors with Strain Gauge Output - Water resistant strain gauge output pressure sensor for measuring hydrostatic liquid level or underwater system pressures.
- Hazardous Area Externally Fitted Hydrostatic Liquid Level Sensors - Hazardous area external mount level sensors for use in zones where there is a high risk of explosive gases being present.
- Seawater Hydrostatic Liquid Level Sensors - Hydrostatic level sensors which are suitable for immersing in seawater for long periods to monitor depth and tidal changes.
- Absolute Unvented Reference Hydrostatic Liquid Level Sensors - Non-vented absolute range hydrostatic level sensors for measuring liquid level where it is not possible or practical to connect a vented gauge reference.
- Marine Approved Hydrostatic Liquid Level Sensors - Marine approved hydrostatic liquid level sensors for use in marine environments.
- Freshwater Hydrostatic Liquid Level Sensors - Liquid level sensors for measuring the level of freshwater in tanks, boreholes, reservoirs, rivers, canals, streams and wells.
- Plastic Submersible Hydrostatic Liquid Level Sensors - Chemical resistant submersible level sensors with a PVC housing and ceramic diaphragm for measuring the hydrostatic level of harsh chemicals.
- Plastic Externally Fitted Hydrostatic Liquid Level Sensors - Plastic liquid level sensors with a PVDF housing and Ceramic diaphragm for fitting to the outside of a chemical storage tank.
- Brackish Water Hydrostatic Liquid Level Sensors - Brackish water depth and level sensors with housing material for use with tidal and coastal sea water.
- Hazardous Area Submersible Hydrostatic Liquid Level Sensors - ATEX/IECEx intrinsically safe IP68 sensors for liquid level measurement in intrinsically safe installations on petrochemical, pharmaceutical, landfill and sewage treatment sites.
- Combined Temperature and Hydrostatic Liquid Level Sensors - Combined temperature & level sensors which provide a signal output for both temperature and hydrostatic pressure measurement from one device.
- Small Diameter Borehole Hydrostatic Liquid Level Sensors - Hydrostatic level sensors for measuring ground water level in small diameter bore-holes.
- SDI-12 Hydrostatic Liquid Level Sensors - SDI-12 interface hydrostatic level sensors with a serial digital interface for measuring liquid depth and returning the reading to low powered telemetry instrumentation in remote locations.
- 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.
Related Product and Application Guides
Related Help Guides
- Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
- Using a screw-in or waterproof pressure transmitter to measure liquid level
- Measuring the volume of liquid in a horizontal cylinder tank
- Improve the electrical termination of vented submersible pressure sensors
- Difference between vented and non-vented water level measurement
- Determining water tank volume using hydrostatic pressure
- How to reduce submersible pressure sensor failures caused by moisture ingress
- Using absolute pressure sensors to measure hydrostatic level
- Determining the hydrostatic pressure range for a tank level sensor
- Considerations for monitoring Landfill Water Level
- Why are Submersible applications so demanding of Pressure Transducers?
Description
Hydrostatic level sensors are pressure sensing devices specifically designed for use on liquid level measurement applications.
All liquids which are under the influence of gravity generate a hydrostatic pressure. This pressure is similar to the weight of a solid object, but because of the fluid state it is possible to measure how the weight of the liquid varies with height.
The resulting pressure at different heights is directly proportional to the weight of a liquid between the surface and a specific height point. The weight of the liquid can be derived from the mass and force (gravity). The mass can be derived from the density and volume of the liquid. The volume of a liquid can be derived from the dimensions of the vessel containing the liquid. If the vessel has a fixed length and width, then the height is directly proportional to the volume, mass, weight and therefore the pressure.
A hydrostatic level sensor is an instrument for measuring the height of a liquid and converting it to an electrical signal. The hydrostatic level signal output can then be utilised by other instrumentation to display, monitor, log or control the liquid level.
There are many different types of technology used 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 a pressure sensor can be installed in a hole at the bottom of the tank which measures the hydrostatic pressure generated by gravity acting on the liquid.
Another method is to lower a hydrostatic level sensing probe into the tank and immerse it in the liquid to measure the pressure generated by gravity acting on the surrounding liquid.
Advantages
- Easily fitted at ground level to any port or take off, which is also convenient for maintenance
- No protrusion inside vessel
- Not affected by any surface disturbances such as turbulence, foaming, vibration
- Small compact size possible
- Compatible for conductive or non-conductive fluids
- Flush diaphragm types prevent clogging and works with thick liquids and slurries containing solids
Disadvantages
- Pressurised or vacuum sealed vessels require a more complex installation
- SG or density change affects calibration
- Flush diaphragm types vulnerable to mechanical damage from debris, cleaning processes
- Requires regular calibration due to gradual error shifts
- Installed in a position below the lowest required liquid level
- Fittings must be leak tight
- Diaphragm movement vulnerable to clogging, wear and tear
- High cost