Endress+Hauser Levelflex FMP55: SensorFusion for Reliable Interface and Level Measurement
September
29, 2026
Endress+Hauser Levelflex FMP55: SensorFusion for Reliable Interface and Level Measurement
Two measuring principles in one instrument
The Endress+Hauser Levelflex FMP55 combines guided wave radar and capacitance through SensorFusion. It is designed for demanding liquid/liquid interface applications, including processes with emulsion layers, and can provide interface and overall level signals simultaneously.
In separators, settlers and process vessels, an interface can become difficult to track when the upper and lower products change or an emulsion zone develops. The FMP55 uses complementary measurement information to increase confidence in the measured value, making it especially relevant to oil and gas, chemical and petrochemical plants.
Why the FMP55 Is Different
Guided radar and capacitance are combined in one multiparameter device for more robust interface measurement.
The instrument measures the liquid/liquid interface and overall level at the same time.
It is engineered for applications with emulsion layers, moving surfaces, foam and changing media.
How SensorFusion Supports Interface Measurement
Guided radar pulses travel along the probe and reflect at changes in dielectric properties. The capacitance principle adds another measurement variable along the probe. By combining both signals, the FMP55 can maintain reliable measured-value acquisition in interface applications where a single principle may be challenged by a broad emulsion layer or varying products.
Levelflex FMP55 Key Specifications
| Parameter | Published specification |
|---|---|
| Measuring principle | Multiparameter: guided radar plus capacitance |
| Measured variables | Liquid/liquid interface and overall level simultaneously |
| Probe options | Rod, rope and coaxial |
| Accuracy | ±2 mm (0.08 in) for rod, rope and coaxial probes |
| Process temperature | −40 to +200 °C (−40 to +392 °F) |
| Process pressure | Vacuum to 40 bar (580 psi) |
| Maximum measuring distance | Rod: 4 m; rope: 10 m; coaxial: 6 m; minimum DK >1.4 |
| Main wetted materials | 316/316L, PTFE and PFA, depending on probe and configuration |
| Communication | 4–20 mA HART, PROFIBUS PA, FOUNDATION Fieldbus; optional Bluetooth |
Specifications and approvals depend on the selected order code. Confirm the current manufacturer documentation, material compatibility and application conditions before ordering.
Typical Applications
- Oil/water separation and production separators
- Petrochemical settlers and decanters
- Interface control in tanks with changing products
- Processes with persistent or varying emulsion layers
- Applications with moving surfaces or foam
- Simultaneous inventory level and interface monitoring
Choosing the Right Probe
| Probe type | Typical selection focus |
|---|---|
| Rod probe | Rigid installation in compact vessels, with a measuring range up to 4 m. |
| Rope probe | Taller vessels and ranges up to 10 m; evaluate clearance and anchoring. |
| Coaxial probe | Controlled signal path and ranges up to 6 m, subject to fluid compatibility and fouling risk. |
FMP54 or FMP55?
| Model | Primary selection focus |
|---|---|
| Levelflex FMP54 | Extreme high-temperature and high-pressure continuous level applications. |
| Levelflex FMP55 | Multiparameter interface measurement, especially with emulsion layers and changing media. |
Information Needed for Correct Selection
- Upper and lower liquid names, dielectric constants and densities
- Expected emulsion thickness and whether it changes over time
- Overall level and interface measuring ranges
- Vessel height, nozzle dimensions, internals and installation clearance
- Process temperature, pressure and wetted-material compatibility
- Probe type, output protocol, hazardous-area and SIL requirements
Contact Us for FMP55 Selection and Quotation
HONGKONG XIEYUAN TECH CO., LIMITED
Email: becky@hkxytech.com
Web: www.hkxytech.com
Mobile: +86-15972186287 (WhatsApp & WeChat)
Technical reference: Endress+Hauser Levelflex FMP55 official product information. Product specifications and availability may change; confirm the complete order code before purchasing.
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