Silopilot M FMM50

Summary

Product identification

Product: Silopilot FMM50 Type: Electromechanical level system

Application

The Silopilot FMM50 is a level meter for bulk solids and fluids, offering a measuring principle independent of physical properties like mass density. It is suitable for:

• Measuring level in bunkers and silos with powdered, fine, or coarse grain bulk solids.
• Measuring level in vessels containing liquids.
• Level measurements up to 90 m.
• Applications with process temperatures up to +230 °C (+446 °F).
• Applications with process pressures up to 3 bar (43.5 psi) absolute.
• Use in aggressive atmospheres, such as acidic or caustic vapors.
• Separation layer detection in fluids with suitable sensing weights.

Benefits

• Suitable for process conditions where ultrasonic or radar level meters may fail.
• Precise level detection with an accuracy of ±5 cm or ±1 pulse.
• Compact transmitter with 0/4 - 20 mA current output and programmable signal outputs (e.g., counter pulse).
• Local operation via a 4-line text display with menu guidance.
• Digital minimum fail-safe control prevents sensor weight from damaging conveying systems.

Operating limits

• Process Temperature:
  • -20 to +70 °C (-4 to +158 °F) (Option 1)
  • -20 to +150 °C (-4 to +302 °F) (Option 2)
  • -20 to +230 °C (-4 to +446 °F) (Option 3)
  • Maximum process temperature at the unit from the bottom of the adaptor flange upwards is +70 °C (+158 °F).
• Process Pressure:
  • 0.8 to 1.1 bar (12 to 16 psi) absolute (Option 1)
  • 0.8 to 3.0 bar (12 to 43 psi) absolute (Option 2)
• Ambient Temperature:
  • -20 to +70 °C (-4 to +158 °F)
  • -40 to +70 °C (-40 to +158 °F) with self-regulating device heater.
• Storage Temperature: -40 to +80 °C (-40 to +176 °F).
• Maximum Measuring Range: 90 m.

Measuring principle

The FMM50 operates by lowering a sensing weight. When the weight contacts the medium, a motor tilts, signaling the electronics to stop the motor. The weight is then pulled up, and the distance is measured by counting pulses from the measuring tape.

Input

• Measured Variable: Distance from the flange to the product surface.
• Calculated Process Values: Filling level, residual volume, volume, or mass (with linearization).
• Safety Variables: Security distance, safety distance.
• Input Signal: Remote operation via two inputs (active or passive).
  • Active Inputs: 12 to 24 V DC, normally open or normally closed.
  • Passive Inputs: Max. 0.3 W / 30 V DC, normally open or normally closed.
  • Start pulse length: min. 200 ms.

Performance characteristics

• Measured Value Resolution: ±5 cm or ±1 pulse.
• Maximum Measured Error: Corresponds to the measured value resolution.
• Measurement Cycle Time: Minimum 1 minute, with recommended minimum of 5 minutes for periodic measurements. Time depends on ambient temperature and measuring range.
• Tape Running Speed: 0.21 to 0.35 m/s.

Output

• Output Signal:
  • Current Output: 0/4 to 20 mA (programmable, active). Max. 22 mA.
  • Relay Outputs: 2 (optional 6). Contact load: max. 250 V AC / 6 A.
• Programmable Relay Functions: Measurement cycle, counter pulse, reset pulse, band return, running up, top position, measuring, alarm, service interval, threshold.
• Signal on Alarm: Local display (error symbol, code, text), current output (minimum, maximum, programmable, or hold), or relay output (alarm function).
• Load (Current Output): Max. 600 Ω.

Electrical

• Supply Voltage:
  • 180 to 253 V AC, 50/60 Hz (Option 1)
  • 90 to 127 V AC, 50/60 Hz (Option 2)
• Power Consumption: Max. 230 VA (Option A or C) or 250 VA (Option B or D).
• Terminals: Max. 2.5 mm² (Supply voltage), Max. 1.5 mm² (Signal inputs, relay outputs, current output).

Mechanical / Hydraulic

• Dimensions: See figures 10, 11, 12, 13, 14.
• Weight: 22 to 28 kg (device only, without sensing weight).
• Materials:
  • Housing: Aluminum (optional coated).
  • Wiper: Aluminum/steel or stainless steel.
  • Measuring tape: Stainless steel or plastic.
  • Sensing weights: Various materials including steel, stainless steel, Polyester, PVC.
• Process Connection: Flange, hole dimensions DN100 PN16 according to EN 1092-1.
• Cable Entries: M25x1.5, clamping range 10 to 17 mm.
• Degree of Protection: IP67 (closed housing), IP65 (closed housing with external start button), IP20 (open housing).

Mounting

• Mounting Location: Select location to prevent product covering or damaging the sensing weight or tape. Consider inflow/outflow cones and avoid fixtures.
• Mounting Position: Typically mounted on a counter flange DN100 PN16. Device can be mounted horizontally (max. 2° inclination).

Environment

• Electromagnetic Compatibility: Interference emission and immunity to EN 61326.
• Vibration: Device should not be exposed to vibration to prevent measurement errors.

Operability

• Operation Concept: Operator-oriented menu structure with commissioning, operation, diagnostics, and expert levels.
• On-site Operation: Local operation via 3 push buttons for configuration and 1 push button for starting measurements. Optional external start button.
• Display: 4-line, 20 characters per line, contrast adjustable. Numeric and graphic display of measurand. Permitted ambient temperature for display: -20 to +60 °C.
• Languages: English, German, French, Japanese. Other languages available optionally.

Certificates and approvals

• CE Mark: Conforms to applicable EU Directives.
• Ex Approval: Data listed in separate documentation.
• RoHS: Complies with substance restrictions of Directive 2011/65/EU and Delegated Directive 2015/863/EU.

Ordering information

Detailed ordering information is available via the Endress+Hauser website Product Configurator or sales center.

Accessories

Various accessories are available, including:

• Weather protection cover.
• Process adapter extensions for higher temperatures.
• Adapter flanges for different pressure ratings and nominal diameters.
• Sensing weights for interface measurement.
• Chain to increase block distance.
• Removal tool and tape stopper.

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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