Liquiphant Failsafe FTL80

Summary

Product identification

• Product: Liquiphant FailSafe FTL80, FTL81, FTL85
• Type: Vibronic Point level switch for liquids

Application

The Liquiphant FailSafe is a point level switch for minimum and maximum detection (MIN/MAX) in liquids.

• Process temperatures: –60 to 280 °C (–76 to 536 °F)
• Ambient temperatures: –60 to 70 °C (–76 to 158 °F)
• Pressure: Up to 100 bar (1450 psi)
• Viscosity: Up to 10000 mPa·s
• Density: From 0.4 g/cm³ (0.4 SGU)
• Media: Suitable for highly corrosive media.

The device is designed for MIN and MAX safety applications up to SIL3 with a focus on fail-safe design and high availability. It features a permanent LIVE signal for function monitoring.

Operating limits

• Process temperature:
  • FTL80, FTL81: –50 to +150 °C (–58 to +300 °F); –60 to +280 °C (–76 to +540 °F) (high-temperature version: 300 °C (572 °F) for a maximum of 50 cumulative hours)
  • FTL85:
    • ECTFE: –50 to +120 °C (–58 to +248 °F)
    • PFA: –50 to +150 °C (–58 to +300 °F)
    • Enamel: –50 to +150 °C (–58 to +300 °F)
• Ambient temperature range:
  • Standard: –40 °C (–40 °F)
  • Optional: –50 °C (–58 °F) or –60 °C (–76 °F)
• Pressure: Up to 100 bar (1450 psi)

Feed water

• Density setting:
  • MAX mode: 0.4 to 2.0 g/cm³ (0.4 to 2.0 SGU)
  • MIN mode: 0.4 g/cm³ (0.4 SGU)
• Viscosity:
  • MAX mode: 10000 mPa·s
  • MIN mode: 350 mPa·s
  • MIN mode with coating, high temperature (230/280 °C): 100 mPa·s
• Solids content: Maximum ø5 mm (0.2 in)

Product water

• Output signal: 4-20 mA interface (acc. to NAMUR NE 06/NE 43)
• Status signals: LEDs indicate: Operation, Function check, Outside specification, Maintenance required, Failure, Power supply issues.
• Error current: < 3.6 mA (as per NAMUR NE 43)

Electrical

• Supply Voltage: DC 24 V nominal (DC 12 to 30 V range)
• Power consumption: < 660 mW
• Reverse polarity protection: Yes
• Connectable load (R): R = (U - 12 V) / 22 mA (where U is supply voltage)
• Galvanic isolation: Between sensor and power supply

Mechanical / hydraulic

• Sensor Types:
  • FTL80: Compact
  • FTL81: With pipe extension
  • FTL85: With coated pipe extension (flanged version only)
• Housing types: Polyester, Stainless steel, Aluminum. Various degrees of protection (IP66, IP67, IP68) and NEMA ratings (4X, 6P) are available depending on the housing material.
• Process connections:
  • Threads: G, R, NPT
  • Flanges: EN, ANSI, JIS standards
• Weights:
  • Basic weight (Sensor, G ¾ thread, Electronic insert, Polyester housing F16, Cover): 0.7 kg (1.5 lbs)
  • Additional weights for various housings, temperature spacers, pressure-tight feedthroughs, threaded connections, and flanges are detailed in the document.
• Materials: Various materials are available for parts in contact with the process and non-process parts, including 316L, AlloyC22, ECTFE, PFA, and Enamel.

Performance characteristics

• Maximum measured error: ±1 mm (± 0.04 in)
• Non-repeatability: 0.1 mm (0.004 in)
• Hysteresis:
  • FTL80, FTL81, FTL85 (ECTFE and PFA): approx. 2 mm (0.08 in)
  • FTL85 (enamel): approx. 2.5 mm (0.1 in)
• Switching time:
  • Fork covered: approx. 0.5 s ±0.2 s
  • Fork exposed: approx. 1.0 s ±0.2 s
  • Dwell time: at least 0.3 s

System components

• Nivotester FailSafe FTL825: A separate switching unit.
  • Power Supply:
    • Mains voltage version: AC/DC 230/115 V (AC 85 to 253 V, 50/60 Hz; DC 85 to 253 V)
    • Extra-low voltage version: AC/DC 24 V (AC 20 to 30 V, 50/60 Hz; DC 20 to 60 V)
  • Outputs: Two floating NO contacts (supervised safety contacts), one floating NC contact (signaling contact), fault-signaling relay.
  • Switching capacity: Up to 253 V / 2 A / 500 VA (AC); Up to 40 V / 2 A / 80 W (DC).
  • Installation: Vertically on DIN top-hat rail.
  • Dimensions: 45 mm (W) x 108 mm (H) x 112 mm (D)

Certificates and approvals

The device has CE marking and complies with applicable EC Directives. Various other approvals are listed, including:

• ATEX (Zone 0, 1, 2, 20, 21, 22)
• CSA C/US (Div 1, Div 2)
• FM C/US (Div 1, Div 2)
• IECEx
• NEPSI
• TIIS
• WHG (overfill and leak detection)
• Marine approval (GL, ABS)
• CRN approval

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Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror