E+H Liquicap M FTI51 Capacitance Level Transmitter

Continuous Capacitance Level Measurement with Endress+Hauser Liquicap M FTI51

The Endress+Hauser Liquicap M FTI51 is an advanced capacitance level transmitter engineered for continuous level and interface measurement in industrial process and storage vessels. Specifically designed for challenging liquids, corrosive chemicals, oils, and viscous media, the FTI51 combines rugged mechanical durability with highly sophisticated electronic evaluation, making it a trusted standard across the chemical, petrochemical, oil and gas, and general process industries.

Advanced Capacitive Measurement Principle & Active Build-Up Compensation

The Liquicap M FTI51 operates on the capacitance change principle, treating the probe rod/rope and the metallic tank wall (or reference tube) as a capacitor. As the liquid level rises or falls, the capacitance between the probe and the container wall changes proportionally. One of the standout technological advantages of the FTI51 is its active build-up compensation. In real-world industrial applications, sticky fluids, foams, or condensation often adhere to the probe rod, leading to false readings in standard capacitance sensors. The FTI51 electronics utilize a clever shield design and compensation circuit that neutralizes the impact of material buildup, ensuring that measurement accuracy remains unaffected by coating and scaling.

Key Features & Technical Advantages

• Active Build-Up Compensation: Eliminates measurement errors caused by viscous coating, scaling, or foam adhesion on the probe.

• Flexible Probe Options: Available with fully insulated rods, partially insulated rods, or rope probes to accommodate varying tank heights and installation requirements.

• Extreme Temperature & Pressure Resistance: Built to handle demanding process conditions, operating seamlessly in temperatures ranging from -50 °C up to +200 °C (-58 °F to +392 °F) and pressures up to 100 bar (1450 psi).

• Modular Housing & Display Options: Features robust aluminum or stainless steel housings with optional local LCD displays for easy on-site commissioning and diagnostics.

• Universal Output & Communication: Supports standard 4–20 mA analog output with HART communication protocol, enabling seamless integration into DCS and PLC automation systems.

• Hazardous Area Certifications: Certified with international explosion-proof approvals (ATEX, FM, CSA, IECEx) for safe deployment in hazardous gas and dust environments.

Reliable Interface Measurement

In addition to standard level monitoring, the Liquicap M FTI51 is exceptionally well-suited for interface layer measurement. It can accurately detect the boundary layer between two immiscible liquids with different dielectric constants, such as oil and water separation tanks in petrochemical facilities and refinery plants.

 Applications 

• Chemical & Petrochemical Industry: Storage tanks for aggressive acids, bases, solvents, alcohols, and petrochemical fluid blends.

• Oil & Gas Processing: Crude oil storage, separator vessels, and oil-water interface measurement.

• Energy & Power Generation: Boiler feedwater heaters, condensate storage tanks, and turbine lubrication oil reservoirs.

• General Industrial Manufacturing: Viscous liquid storage, coating vats, washing liquids, and process water tanks.

Technical Specifications 

Parameter / Feature	Specification Details
Measuring Principle	Capacitive continuous level measurement
Probe Types	Rod probe (fully/partially insulated) or Rope probe
Max. Probe Length	Rod up to 6 m (20 ft) | Rope up to 30 m (100 ft)
Process Temperature	-50 °C to +200 °C (-58 °F to +392 °F)
Process Pressure (Abs.)	Vacuum up to 100 bar (1450 psi)
Dielectric Constant (DC)	Min. DC 1.5
Output Signal	4–20 mA with HART communication
Wetted Materials	316L Stainless Steel, PTFE, PFA, or FEP insulation
Process Connections	Threaded (G, NPT) or Flanged (ASME, EN, JIS)
Housing Materials	Powder-coated aluminum or 316L cast stainless steel
Ingress Protection	IP66 / IP67 (NEMA 4X)
Hazardous Approvals	ATEX, FM, CSA, IECEx, NEPSI

Key Features & Benefits

• Coating-Resistant Accuracy: Active build-up compensation ensures flawless readings even when dealing with sticky or viscous media.

• Heavy-Duty Reliability: Rugged mechanical design withstands high mechanical stress, aggressive chemicals, and elevated pressures.

• Versatile Probe Configurations: Suitable for both short vertical tank sections and deep industrial storage silos.

• Dual-Functionality: Capable of both continuous level measurement and phase-separation (interface) detection.

• Global Safety Compliance: Fully certified for hazardous location usage across international industrial markets.

FAQ

Q1: How does the Liquicap M FTI51 handle sticky or viscous buildup on the probe?

Answer: The FTI51 features built-in active build-up compensation. A specialized shielding circuit neutralizes the electrical capacitance caused by material adherence, ensuring that only the actual medium level is measured.

Q2: Can the FTI51 be used for interface layer measurement?

Answer: Yes, the FTI51 can be configured to measure the interface layer between two different liquid phases (such as oil sitting on top of water) provided there is a sufficient difference in their dielectric constants.

Q3: What is the maximum probe length available for the FTI51?

Answer: Rod probes can be supplied up to 6 meters (20 feet) in length, while rope probes can extend up to 30 meters (100 feet) for deep vertical tanks.

Q4: Is the Liquicap M FTI51 suitable for high-temperature and high-pressure tanks?

Answer: Yes, the transmitter is engineered for extreme industrial conditions, supporting process temperatures up to 200 °C and pressures up to 100 bar depending on the selected configuration and process connection.

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