Prosonic FMU40

Summary

Product Identification

• Product Name: Prosonic M FMU41
• Technology: Ultrasonic measuring technology
• Type: Compact transmitter for non-contact level and flow measurement
• Communication: HART protocol

Application

• Two-wire version for non-contact level and flow measurement.
• Process connection: Thread.
• Suitable for liquids and bulk solids.
• Features international explosion protection certificates.

Operating Limits

• Temperature Range:
  • Process: -40 to +80 °C (-40 to +176 °F)
  • Ambient: -40 to +80 °C (-40 to +176 °F)
  • Storage: -40 to +80 °C (-40 to +176 °F)
• Pressure Range: 0.7 to 3 bar abs. (10.15 to 43.5 psi abs.)
• Blocking Distance: 0.35 m (1.1 ft) for liquids and bulk solids.

Measurement Capabilities

• Maximum Measuring Range:
  • Liquids: 8 m (26 ft)
  • Bulk solids: 3.5 m (11 ft)
• Measured Variable: Distance (D) between sensor membrane and product surface. Can be converted to Level (L), Volume (V), or Flow (Q) with linearization.
• Operating Frequency: Approximately 50 kHz.
• Maximum Sound Pressure Level: 143 dB directly in front of the sensor.

Performance Characteristics

• Measured Value Resolution: 1 mm (0.04 in).
• Maximum Measured Error: ±0.2 % of the maximum sensor span under reference operating conditions.
• Measuring Error: ±2 mm (±0.08 in) or 0.2 % of the measured distance (empty calibration), whichever is larger.
• Response Time: Minimum ≥ 2 s (two-wire version).
• Pulse Frequency: ≤ 0.5 Hz (two-wire version).

Electrical

• Output Signal: 4 to 20 mA with HART protocol.
• Supply Voltage (Two-wire version, HART):
  • Standard: 14 to 36 V (at 4 mA), 8 to 36 V (at 20 mA).
  • Ex ia: 14 to 30 V (at 4 mA), 8 to 30 V (at 20 mA).
  • Ex d: 14 to 30 V (at 4 mA), 11 to 30 V (at 20 mA).
• Power Consumption (Two-wire version): 51 to 800 mW.
• Current Consumption (Two-wire version): 3.6 to 22 mA.
• Load: Minimum load for HART communication: 250 Ω.
• Output Damping: User-defined, 0 to 255 s.

Mechanical / Hydraulic

• Process Connections: Thread 2", Thread NPT 2" - 11.5.
• Sensor Material: PVDF.
• Seal Material: EPDM.
• Housing Materials: T12 and F12 housing: AlSi10Mg powder-coated.
• Weight: Approximately 2.6 kg (5.73 lb).
• Degree of Protection: IP68 / NEMA 6P (housing closed, 24 h at 1.83 m water), IP66 / NEMA 4X (housing closed), IP20 / NEMA 1 (housing open, display).

Operability

• Languages: 7 languages supported (de, en, es, fr, ja, it, nl).
• Local Operation: Via display and operating module (VU331).
• Remote Operation: Via personal computer (FieldCare, Commubox, etc.) or industrial handheld terminal (Field Xpert).

Environment

• Ambient Temperature Range: -40 to +80 °C (-40 to +176 °F). LCD display functionality limited below -20 °C and above +60 °C.
• Storage Temperature: -40 to +80 °C (-40 to +176 °F).
• Thermal Shock Resistance: According to DIN EN 60068-2-14; test Nb: +80 to –40 °C, 1 K/min, 100 cycles.
• Climate Class: DIN EN 60068-2-38 (Test Z/AD); DIN/IEC 68 T2-30Db.
• Vibration Resistance: DIN EN 60068-2-64/IEC 68-2-64: 20 to 2000 Hz, 1 (m/s²)²/Hz; 3 x 100 min.
• Electromagnetic Compatibility: According to EN 61326 series and NAMUR Recommendation EMC (NE 21).

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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