Prosonic S FMU90

Summary

Product Identification

• Product Name: Prosonic S FMU90
• Product Type: Transmitter for 1 or 2 ultrasonic sensors
• Technology: Ultrasonic measuring technology
• Document ID: TI00397F/00/EN/19.21
• Document Date: 2021-05-31

Application

The Prosonic S FMU90 is designed for:

• Level measurement and point level measurement of liquids or bulk solids.
• Flow measurement in open channels or weirs.
• Pump and rake control.
• Advanced pump control functions (e.g., pump function test).
• Calculation of average, difference, or total values.
• Backwater or dirt detection.
• Totalization of flow volume with up to 3 totalizers and 3 daily counters.
• Counting and time pulses for controlling external units.

Operating Limits

• Measuring Range: Up to 45 m (148 ft).

Input

Sensor Inputs

• Number of Sensor Inputs: 1 or 2 (defined by order code 060).
• Connectable Sensors: FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95.
• Old Connectable Sensors: FDU80, FDU80F, FDU81, FDU81F, FDU82, FDU83, FDU84, FDU85, FDU86, FDU96 (support for existing installations; manual type specification required for FDU8x; certain FDU8x sensors with Ex approval are not certified for Prosonic S).

External Point Level Switch Inputs

• Number of Inputs: 4 (order code 090).
• Switching Possibilities: External passive point level switch (NC or NO contact).
• Voltage Levels: 0: < 8 V, 1: > 16 V.
• Possible Applications: Pump feedback, pump tariff control, start/stop/reset daily counters for flow measurements, min/max level detection.

External Temperature Sensor Input

• Number of Inputs: 1 (order code 090).
• Use: Sound time-of-flight correction for FDU90 and FDU91 with sensor heating.
• Connectable Sensors: Pt100 (3-wire or 4-wire connection). A 2-wire Pt100 is not recommended due to accuracy.

Output

Analog Outputs

• Number of Outputs: 1 or 2 (order code 080).
• Type: Active current output.
• Output Damping: User-definable (0 to 1000 s).
• Load: Max. 600 Ω.
• Output Signal: Configurable as 4 to 20 mA with HART or 0 to 20 mA without HART. HART signal is on the first analog output only.
• Response to Errors: Configurable (MIN, MAX, HOLD, User-specific value).

Relays

• Number of Relays: 1, 3, or 6 (order code 070).
• Type: Potential-free changeover contact (SPDT), can be inverted.
• Switching Capacity (DC): 35 VDC, 100 W.
• Switching Capacity (AC): 4 A, 250 V, 1000 VA (cosφ = 0.7).
• Assignable Functions: Limit value, inband, out of band, counting pulse (max. 2 Hz), time pulse (max. 2 Hz), alarm/diagnostics (backwater, dirt, echo loss), pump control (individual, alternating, fixed limit, pump rate), advanced pump control, rake control, fieldbus relay.
• Response to Errors: Configurable (HOLD, Energized, De-energized, Current value).
• Switch-on Delay: Configurable after power failure.

PROFIBUS DP Interface

• Device Version: Order code 080, option 3.
• Profile: 3.0.
• ID Number: 1540 (hex) / 5440 (dec).
• GSD File: EH3x1540.gsd.
• Addressing: DIP switches or software (default address: 126).
• Bus Termination: Activatable/deactivatable switch.
• Locking: Hardware or software lockable.
• Transmittable Values: Primary values (level/flow), distances, counters, temperatures, averages/differences/totals, relay status, rake control, pump control.
• Function Blocks: 10 AI, 10 DI, 10 DO.
• Supported Baud Rates: 9.6 kbaud to 12 Mbaud.

Power Supply

Alternating Voltage (AC)

• Device Version: Order code 050, option A.
• Supply Voltage: 90 to 253 VAC (50/60 Hz).
• Power Consumption: ≤ 23 VA.
• Current Consumption: ≤ 100 mA at 230 VAC.

Direct Voltage (DC)

• Device Version: Order code 050, option B.
• Supply Voltage: 10.5 to 32 VDC.
• Power Consumption: ≤ 14 W (typically 8 W).
• Current Consumption: ≤ 580 mA at 24 VDC.

Galvanic Isolation

• Isolated between: Power supply, sensor inputs, analog outputs (1 & 2), relay outputs, bus connection (PROFIBUS-DP).

Fuse

• AC: 400 mA T /AC.
• DC: 2 A T /DC.

Mechanical Construction

Dimensions

• Polycarbonate Field Housing: See diagram (overall height approx. 216 mm).
• Aluminum Field Housing: See diagram (overall height approx. 232 mm).
• DIN Rail Housing: Dimensions depend on the number of additional terminal areas (max. width approx. 208 mm for 4 areas).
• Remote Display and Operating Module: See diagram (height 96 mm, width 92 mm).

Weight

• Polycarbonate Field Housing: Approx. 1.6 to 1.8 kg.
• Aluminum Field Housing: Approx. 6 kg.
• DIN Rail Housing: Approx. 0.7 kg.
• Remote Display and Operating Module: Approx. 0.5 kg.

Materials

• Polycarbonate Field Housing: Housing bracket: PC-FR; Field housing: PC-FR; DIN rail housing: PBT-GF; Display/operating module: PC; Seal: PUR soft foam; Nameplate: polyester; Screws: A4.
• Aluminum Field Housing: Seal: silicone; Aluminum field housing: EN AC-AlSi12 (Fe); DIN rail housing: PBT-GF; Nameplate: polyester; Ground connection: A2; Display/operating module: PC; Dummy plug: nickel-plated brass; O-ring: EPDM 70 + PTFE; Screws: A2.

Performance Characteristics

• Reference Operating Conditions: Temperature (+24 °C ±5 °C), Pressure (960 mbar ±100 mbar), Humidity (60 % r.F. ±15 % r.F.), surface conditions.
• Maximum Measured Error: ±0.2 % of maximum sensor span.
• Measured Error: ±2 mm + 0.17 % of measured distance.
• Measured Value Resolution: 1 mm (for FDU90/FDU91).
• Measuring Frequency: Max. 3 Hz.
• Influence of Vapor Pressure: Negligible if pv ≤ 50 mbar at 20 °C for media like water, aqueous solutions, oils, etc. Accuracy may be compromised for media like ethanol, acetone, ammonia.

Environment

• Ambient Temperature: –40 to 60 °C (LCD limited below –20 °C).
• Storage Temperature: –40 to 60 °C.
• Climate Class: Varies by housing type (Polycarbonate/Aluminum: 4K2/4K5/4K6/4Z2/4Z5/4C3/4S4/4M2; DIN rail: 3K3/3Z2/3Z5/3B1/3C2/3S3/3M1).
• Vibration Resistance: Varies by housing type (Polycarbonate/Aluminum: 1.0 (m/s²)²/Hz; DIN rail: 0.5 (m/s²)²/Hz, 20 to 2000 Hz).
• Degree of Protection:
  • Polycarbonate/Aluminum Field Housing: IP66 / NEMA 4x.
  • DIN Rail Housing: IP20.
  • Remote Display: IP65 / NEMA 4 (front), IP20 (rear).
• Electromagnetic Compatibility (EMC): Meets EN 61326 series and NAMUR NE 21. Designed for industrial environments (Class A emission).

Certificates and Approvals

• CE Mark: Confirms compliance with EU Directives.
• RoHS: Not compliant with RoHS 2 substance restrictions.
• RCM-Tick Marking: Meets ACMA requirements.
• EAC Conformity: Meets EAC guidelines.
• Ex Approval: Available; refer to Product Configurator. FDU9x sensors with Ex approval can connect to FMU90 without Ex approval.

Accessories

• Communication: Commubox FXA195, Commubox FXA291.
• Device Specific: Weather protection cover, mounting plate, frames (700 mm, 1400 mm), adapter plate for remote display.
• Cables: Extension cables for sensors (various types and temperature ratings).
• Temperature Sensor: Omnigrad S TR61.

Supplementary Documentation

• Technical Information for specific sensors (FDU90, FDU91, etc.).
• Operating Instructions (BA00288F, BA00289F, BA00292F, BA00293F).
• Description of Device Parameters (GP01151F).
• Slot/Index lists (PROFIBUS DP) (BA00333F).
• Safety Instructions (XA00326F).

---

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