Many industrial processes involve storing or processing two immiscible liquids, such as oil and water. Measuring only the total liquid level is often not enough—the interface between the two liquids also needs to be monitored accurately. An Interface Level Transmitter provides continuous measurement of this boundary, helping industries improve process efficiency, product quality and operational reliability.
From oil refineries to wastewater treatment plants, interface level transmitters play a vital role in maintaining stable and efficient industrial processes.
An Interface Level Transmitter is an instrument designed to measure the boundary between two liquids with different densities.
Unlike standard level transmitters that measure the overall liquid level, interface level transmitters continuously monitor where one liquid ends and another begins.
Typical examples include:
The measured data is transmitted to monitoring or control systems, enabling operators to optimise industrial processes.
Accurate interface measurement improves both process efficiency and product quality.
Maintain proper separation between liquids during processing.
Optimise separation processes and reduce material losses.
Continuous automatic measurement eliminates frequent manual inspections.
Provide reliable level data to PLC and SCADA systems.
Prevent product contamination caused by inaccurate interface detection.
Enable consistent performance across industrial processes.
Although different technologies are available, the operating principle is generally similar.
Continuous monitoring improves accuracy while reducing manual intervention.
Several technologies are used depending on the application.
Uses microwave pulses to detect both total level and liquid interface with high accuracy.
Suitable for challenging process conditions requiring reliable non-contact measurement.
Measures changes in electrical capacitance between different liquids.
Suitable for selected interface applications involving relatively stable process conditions.
Uses pressure differences to estimate interface levels in certain tank configurations.
Mechanical solutions for basic interface monitoring in specific applications.
Technology | Best For | Typical Applications |
Guided Wave Radar | High Accuracy | Oil & Gas |
Radar | Non-contact Measurement | Chemical Processing |
Capacitance | Conductive Liquids | Industrial Tanks |
Differential Pressure | Large Vessels | Process Industries |
Ultrasonic | Clean Liquids | Water Treatment |
Float System | Simple Applications | Storage Tanks |
Interface measurement is important across many industries.
Monitor oil-water separation tanks and storage vessels.
Control separation processes involving multiple liquid phases.
Measure sludge blankets and oil-water separators.
Support controlled separation processes during production.
Monitor slurry separation and process tanks.
Measure condensate and water separation systems.
Monitor ballast and fuel storage tanks.
Maintain accurate liquid separation during specialised manufacturing processes.
Before selecting an interface level transmitter, consider:
✔ Type of liquids
✔ Density difference
✔ Tank geometry
✔ Operating temperature
✔ Operating pressure
✔ Measurement range
✔ Required accuracy
✔ Process connections
✔ Communication protocol
✔ Installation location
Selecting the appropriate technology helps maximise measurement reliability and long-term performance.
Common selection mistakes include:
Proper application assessment helps ensure accurate and reliable measurements.
Accurate interface measurement helps industries improve product recovery, reduce waste and optimise separation processes.
Reliable interface monitoring also supports automation, reduces manual intervention and improves operational efficiency across industrial facilities.
ADYAA supplies advanced level measurement solutions for industrial applications across Australia.
Radar, Guided Wave Radar, Ultrasonic, Capacitance and Interface Level Transmitters.
Support in selecting the right technology for your application.
Solutions designed for demanding industrial environments.
Compatible with PLC, SCADA and modern process control systems.
Reliable technical assistance across Australia.
Helping industries improve process visibility, efficiency and measurement accuracy.
An Interface Level Transmitter measures the boundary between two liquids with different densities inside a vessel or tank.
They are commonly used in oil & gas, chemical processing, wastewater treatment, mining, food processing and pharmaceutical industries.
The most suitable technology depends on the application, but guided wave radar is widely used for accurate interface measurement.
Many guided wave radar transmitters can measure both the total liquid level and the interface level simultaneously.
Selection depends on liquid properties, tank design, operating conditions, required accuracy and installation requirements.
Routine inspection and periodic calibration help maintain reliable long-term measurement performance.
Accurate Interface Level Transmitter solutions help industries improve separation efficiency, reduce product losses and maintain consistent process performance. Selecting the right measurement technology ensures reliable operation even in demanding industrial environments.
ADYAA supplies industrial interface level transmitters and advanced level measurement solutions for customers across Australia, helping businesses achieve accurate, reliable and efficient level monitoring.
Our specialists can help you choose the most suitable interface level measurement solution for your application.