Summary

Soliphant M FTM51 Universal Point Level Switch

Product Identification

The Soliphant M FTM51 is a point level switch designed for fine-grained or dusty bulk solids, even those with low bulk weight. It is available with various certificates for use in potentially explosive atmospheres. The device can be installed in any position with an extension pipe up to 4 m (13 ft).

Operating Limits

• Process Temperature Range: Up to 280 °C (536 °F)
• Medium Pressure Range: –1 to +25 bar (–14.5 to +362.5 psi)
• Ambient Temperature Range: –50 to +70 °C (–58 to +158 °F) (–40 to +70 °C for F16 housing)
• Storage Temperature: –50 to +85 °C (–58 to +185 °F)
• Operating Height: Up to 2 000 m (6 500 ft) above sea level (extendable to 3 000 m with OVP)
• Pollution Degree: PD 1
• Vibration Resistance: As per EN 60068-2-64: 0.01 g²/Hz
• Shock Resistance: As per EN 60068-2-27: 30 g
• Thermal Shock: Maximum 120 K, or 260 K at high temperature.

Feed Water / Medium Characteristics

• Grain Size: ≤ 10 mm (0.39 in)
• Bulk Density:
  • Standard fork: ≥ 10 or 50 g/l
  • Short fork: ≥ 50 or 200 g/l
• Lateral Load (static): Maximum permitted lateral load is detailed graphically in the document.
• Burst Pressure: 100 bar (1 450 psi)

Product Water / Output

• Measured Variable: Level (in line with orientation and length)
• Measuring Range: Length 300 to 4 000 mm (11.8 to 157 in)
• Detection Range: Located within the length of the tuning fork.
• Fork Lengths:
  • Standard fork: 155 mm (6.1 in)
  • Short fork: 100 mm (3.94 in)
• Input Signal: Amplitude change of the tuning fork; selectable frequency monitoring for abrasion and buildup detection.
• Switching Delay: Configurable (0.5 s to 5 s) depending on sensor state and temperature.
• Safety Modes: MAX (overfill prevention) and MIN (dry-running protection) are selectable.

Electrical

• Electronic Inserts (Examples):
  • FEM51: Two-wire AC, switches load directly via thyristor. Supply voltage: 19 to 253 V AC. Power consumption: < 1.0 W.
  • FEM52: Three-wire DC, PNP transistor output. Supply voltage: 10 to 55 V DC. Current consumption: max. 16 mA. Power consumption: max. 0.86 W.
  • FEM54: Universal current version with relay output (DPDT contacts). AC supply: 19 to 253 V AC. DC supply: 19 to 55 V DC. Power consumption: max. 1.5 W.
  • FEM55: 8/16 mA signal transmission. Supply voltage: DC 11 to 36 V. Power consumption: < 600 mW.
  • FEM57: PFM signal transmission. Supply voltage: DC 9.5 to 12.5 V. Power consumption: < 150 mW.
  • FEM58: NAMUR H-L edge signal transmission. Supply voltage: DC 8.2 V ±20 %. Power consumption: < 8 mW to < 36 mW.
• Galvanic Isolation: Varies by electronic insert type.
• Electrical Connection: Screw terminals or M12 plug, depending on configuration. Cable entries support M20x1.5 coupling for cable diameters from ø5 to 10.5 mm.
• Overvoltage Protection: Category II for FEM51, FEM52, FEM54, FEM55.

Mechanical / Hydraulic

• Degree of Protection: IP66/IP67 or IP66/IP68 (NEMA4X or NEMA4X/6P), depending on housing.
• Housing Materials: Polyester (F16), Stainless Steel (F15, F27), Aluminum (F17, F13, T13).
• Materials in Contact with Process: 316L (1.4404, 1.4435) for process connections, extension pipes, and tuning forks.
• Surface Refinement: Options for electropolishing (Ra < 0.76 µm) or coating (PTFE, ETFE) to minimize buildup and corrosion.
• Dimensions: Various dimensions depending on housing and process connection type. For example, Polyester housing F16 has a diameter of ø85 mm (3.35 in).
• Weight: Varies by type, refer to ordering information.

Certificates and Approvals

• Functional safety up to SIL2 as per IEC 61508.
• Various Ex approvals available (refer to Product Configurator).
• CE mark, RCM-Tick marking, EAC conformity.
• CRN approval.
• ASME B 31.3 compliance.
• Process seal as per ANSI/ISA 12.27.01.
• Pressure Equipment Directive 2014/68/EU (PED) compliance for applicable equipment.
• RoHS compliant.

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Disclaimer: 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