E+H Liquipoint FTW23 Capacitance Point Level Switch

Hygienic and Reliable Point Level Detection with Liquipoint FTW23

The Endress+Hauser Liquipoint FTW23 is a compact, high-precision capacitance point level switch designed for continuous limit detection in liquid media. Tailored to meet stringent international hygiene standards (3-A, EHEDG) in food and beverage processing, the FTW23 is equally suited for utility systems, skid automation, and storage vessels in general industrial manufacturing. It provides dependable high-level overfill prevention and low-level pump protection for water-based, oil-based, and alcoholic media.

Advanced Capacitive Measurement Principle

Operating on the capacitive measuring principle, the Liquipoint FTW23 detects capacitance shifts when the sensor tip comes into contact with the process medium. The integrated electrode measures capacitance changes relative to the metal vessel wall or sensor housing. Out of the box, the FTW23 comes factory-calibrated for media with a dielectric constant (DC) > 20, covering water, milk, beverages, and aqueous solutions. With optional IO-Link communication, the detection threshold can be fine-tuned down to DC > 1.5, allowing reliable switching in oils, alcohol, and light powders.

Key Features & Hygienic Advantages

• Flush-Mounted Hygienic Design: Flush installation prevents build-up and ensures easy cleanability in food processing lines, mixing vessels, and filling equipment.

• Full CIP/SIP Capability: Withstands aggressive Clean-In-Place (CIP) and Sterilization-In-Place (SIP) thermal cleaning cycles up to 135 °C (275 °F) for up to 60 minutes.

• Plug-and-Play Installation: No medium-specific adjustment is required for standard water-based liquids, eliminating complex field setup and recalibration time.

• Compact & Rugged Build: High-grade 316L stainless steel body and PEEK sensor isolation housed in an IP66/IP68/IP69 enclosure guarantee resistance against high-pressure washdown and aggressive ambient conditions.

• IO-Link Communication & Smart Diagnostics: Supports IO-Link digital connectivity for easy parameterization, continuous switch state transmission, and enhanced device diagnostics.

• Clear On-Site LED Indication: High-visibility LED ring provides instant visual verification of power supply and switching status on the factory floor.

Versatile Integration for Skid Builders & Process Automation

Thanks to its ultra-compact dimensions and choice of standard thread connections (G 1/2″, G 3/4″, G 1″, M24), the Liquipoint FTW23 fits seamlessly into tight piping runs and compact OEM equipment skids. Whether deployed as a high-level limit switch in mixing vats or a low-level dry-run sensor in centrifugal pump suction lines, the FTW23 provides robust, vibration-resistant limit signaling.

Applications

• Food & Beverage Industry: Milk processing, soft drink bottling, breweries, fruit juice preparation, liquid sugar tanks, and sauce mixing vessels.

• Water & Wastewater Treatment: Chemical dosing tanks, water filtration units, pump dry-run protection, and storage sumps.

• Industrial Utilities & Machinery: Cooling water systems, CIP cleaning skids, hydraulic oil reservoirs, and lubricant distribution tanks.

• Pharmaceutical & Personal Care: Purified water distribution, syrup tanks, lotion mixing, and hygienic fluid transport lines.

Technical Specifications 

Parameter / Feature	Specification Details
Measuring Principle	Capacitive point level detection
Medium Dielectric Constant (DC)	Standard: DC > 20 (Water-based) | Via IO-Link: DC > 1.5
Process Temperature	Standard: -20 to +100 °C (-4 to +212 °F) | CIP/SIP: Up to 135 °C (275 °F) for 1 h
Process Pressure (Abs.)	Vacuum to 16 bar (-14.5 to 232 psi)
Supply Voltage	10 to 30 V DC (IO-Link operation requires ≥18 V DC)
Output Signal	DC-PNP (3-wire / 4-wire) or IO-Link digital interface
Wetted Materials	Sensor: 316L (1.4404) | Sensor Insulation: PEEK
Process Connections	Thread G 1/2″, G 3/4″, G 1″, M24x1.5 (Hygiene adapters available)
Ingress Protection	IP65/IP67/IP66/IP68/IP69 (NEMA 4X/6P)
Hygienic Certificates	3-A, EHEDG
Status Display	Integrated LED function display

 Key Features & Benefits (分点亮点)

• Maintenance-Free Limit Detection: No moving mechanical parts, preventing wear, clogging, or sensor fatigue over time.

• High-Temperature CIP/SIP Cleanable: Certified to IP69 washdown standards and capable of withstanding 135 °C steam sterilization cycles.

• No Medium Adjustment Needed: Ready for immediate use out of the box for most water-based liquid applications.

• Smart Digital IO-Link Interface: Simplifies parameter setting, remote diagnostics, and automated batching integration.

• Ultra-Compact Footprint: Fits easily into small diameter pipes, narrow tank necks, and OEM machine skids.

FAQ

Q1: Can the Liquipoint FTW23 be used in food and dairy applications?

Answer: Yes, the FTW23 is specifically designed for hygienic process environments and complies with 3-A and EHEDG standards, using FDA-listed 316L stainless steel and PEEK wetted materials.

Q2: Does the FTW23 require calibration when changing process liquids?

Answer: No, for standard water-based media (DC > 20), no calibration is required. For media with lower dielectric constants (DC > 1.5, such as oils or alcohol), the switching threshold can be adjusted via IO-Link.

Q3: Can the sensor withstand high-pressure washdowns and steam cleaning?

Answer: Yes, the FTW23 is IP69 rated and withstands CIP/SIP cleaning processes up to 135 °C (275 °F) for 60 minutes.

Q4: What process connections are available for the FTW23?

Answer: The FTW23 offers standard G 1/2″, G 3/4″, G 1″, and M24 thread process connections, with optional weld-in adapters and hygienic adapters (Tri-Clamp, Varivent, etc.).

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