—– Measurement Systems / Interface Level
Reliable Interface Level Measurement for Difficult Separation Processes
Non-contact radiometric, or nuclear, measurement reliably measures the boundary between two liquids or process materials through the vessel wall, even when pressure, temperature, corrosive media, solids, emulsion, or buildup make intrusive interface instruments difficult to apply or maintain.
THE MEASUREMENT CHALLENGE
Interface measurement becomes difficult when process conditions are severe
Separators, desalters, treaters, and other vessels often depend on stable interface control, but conventional probes, displacers, and internal devices can be affected by pressure, temperature, corrosion, coating, solids, and changing process composition. Emulsion layers and variable density between the two phases can make the interface difficult to distinguish consistently, while in-vessel maintenance can create additional safety and operating concerns.
THE RONAN APPROACH
Measure the interface without putting a device into the process
Ronan interface level systems position the source holder and detector outside the vessel at the required measurement range. As the interface between materials of different densities moves through the beam path, the amount of radiation reaching the detector changes. The X96 microprocessor converts that change into a continuous interface-level reading for display, control, alarms, logging, or plant-system output.
HOW IT WORKS
Three coordinated components track the interface between process materials.
A source holder and detector are aligned across the vessel at the required interface measurement range. As the boundary between process materials of different densities moves through the beam path, the energy reaching the detector changes. The microprocessor converts that change into a continuous interface-level reading.
STEP 1
The source holder defines the measurement range.
A controlled beam is directed through the vessel across the expected interface range.
STEP 2
The detector tracks the changing interface.
As the denser or lighter phase moves through the beam path, the amount of energy reaching the detector changes.
STEP 3
The microprocessor converts the signal into interface level.
The X96 microprocessor processes the detector signal and provides the selected interface-level output to the operator or control system.
The system is engineered around the process and measurement requirements
Ronan evaluates the process materials, expected density difference, vessel geometry, interface range, and operating conditions before defining the source holder, detector, and electronics configuration.
What determines the interface level configuration:
- Expected density difference between the process phases and how that difference may vary during operation
- Vessel dimensions, wall thickness, insulation, refractory, and internal structures
- Required interface measurement range, control objective, and output requirements
- Emulsion-layer thickness, solids, foam, buildup, temperature, pressure, and available mounting access
A clear, measurable density difference is essential
Radiometric interface measurement depends on the density difference between the process phases. Ronan reviews density variation and the presence of a transition or emulsion layer to determine the appropriate measurement approach and achievable performance.
Common interface level applications
- Oil-water separators and produced-water treatment vessels
- Desalters, treaters, and emulsion-separation vessels
- Three-phase production separators
- Settling tanks, decanters, and liquid-liquid separation vessels
Industries
See applications and process challenges:
Technical Resources
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About
For more than 60 years, Ronan Engineering has manufactured reliable and leading-edge instrumentation systems. As providers of real-time monitoring and measurements of critical process control points, Ronan has kept some of the world’s largest plants, factories, and facilities running safely and efficiently. Ronan has established manufacturing, sales and service facilities in Kentucky and the United Kingdom.