Micropilot M FMR20

Summary

Product identification

• Product Name: Micropilot FMR20 HART
• Type: Free space radar for bulk solids
• Document: TI01591F/00/EN/02.21
• Version: 71534157, 2021-08-02

Application

• Ingress Protection: IP66/68 / NEMA 4X/6P
• Maximum Measuring Range: up to 10 m (32.8 ft)
• Process Temperature: –40 to 80 °C (–40 to 176 °F)
• Accuracy: up to ± 5 mm (0.2 in)
• Key Features:
  • Level measurement for solids.
  • Wireless remote access via free iOS/Android app SmartBlue.
  • Hermetically sealed wiring and potted electronics to prevent dust ingress and allow operation under harsh environmental conditions.

Measuring Principle

The Micropilot uses a time-of-flight (ToF) method to measure the distance from a reference point to the product surface by emitting radar impulses, reflecting them off the surface, and receiving the echo. The distance (D) is calculated using D = c · t/2, where c is the speed of light and t is the time of flight. The level (L) is then calculated based on the known empty distance (E): L = E – D.

Input

• Measured Variable: Distance from reference point to product surface.
• Measuring Range: Maximum 10 m (32.8 ft).
• Installation Requirements:
  • No agitators.
  • No buildup.
  • Relative dielectric constant εr > 2 (Contact Endress+Hauser for lower values).
• Usable Measuring Range: Dependent on medium reflectivity, installation, and interference. Optimized for coarse-grained material and use of flooding protection tube.
• Operating Frequency: K-band (~ 26 GHz).
• Transmission Power: Mean power density < 12 nW/cm² at 1 m and < 0.4 nW/cm² at 5 m.

Output

• Output Signal: 4 to 20 mA (used for measured value output and device power).
• Digital Output:
  • HART®: FSK ±0.5 mA over current signal, 1200 Bit/s.
  • Bluetooth® wireless technology (optional): Range up to 25 m (82 ft) under reference conditions.
• Signal on Alarm:
  • Current Output: 22.5 mA (NAMUR NE 43).
  • Digital Communication (HART/SmartBlue): Status signal (NAMUR NE 107), plain text display.
• Linearization: Supports conversion to units of length, weight, or volume, with pre-programmed curves for common tank shapes and manual entry of up to 32 value pairs.

Protocol-specific data, HART

• Manufacturer ID: 17 (0x11)
• Device Type ID: 44 (0x112c)
• HART Specification: 7.0
• HART Load: Min. 250 Ω
• HART Device Variables: Includes linearized level (PV), distance (SV), relative echo amplitude (TV), and temperature (QV).

Electrical connection

• Supply Voltage: 10.5 to 30 VDC.
• Power Consumption: Maximum input power: 675 mW.
• Current Consumption: Maximum input current: < 25 mA; Maximum start-up current: 3.6 mA.
• Starting Time: First stable measured value after 20 s (with 24 VDC supply).
• Power Supply Failure: Configuration remains stored.

Performance characteristics

• Reference Operating Conditions: Temperature +24 °C (±5 °C), Pressure 960 mbar abs. (±100 mbar), Humidity 60 % (±15 %), Reflector: metal plate ≥ 1 m.
• Maximum Measured Error:
  • Digital (HART, SmartBlue): ±5 mm (±0.2 in) for linearity, non-repeatability, hysteresis; ±4 mm (±0.16 in) for offset/zero point.
  • Analog (4-20mA): ±0.02 % for linearity, non-repeatability, hysteresis; ±0.03 % for offset/zero point.
• Measured Value Resolution:
  • Digital: 1 mm (0.04 in).
  • Analog: 4 µA.
• Response Time: < 3 s (step response time, damping off, for tank height <10 m).
• Influence of Ambient Temperature:
  • Digital: ±3 mm (±0.12 in)/10 K (standard version).
  • Analog: Zero point TK = 0.02 %/10 K; Span TK = 0.05 %/10 K.

Installation

• Installation Conditions: Various types including wall, ceiling, nozzle, and slip-on flange mounting.
• Nozzle Installation: Antenna should project out of the nozzle; smooth interior required. Limits for nozzle diameter and length apply depending on antenna size and installation type.
• Device Alignment: Perpendicular to the product surface.
• Blocking Distance (BD): Suppresses interference signals; automatic calculation or manual overwrite. Standard is 0.1 m (0.33 ft).
• Beam Angle: 80 mm antenna has a 12° beam angle (α). Beamwidth (W) = D × 0.21.
• Measurement in Plastic Vessels: Potential for reflections from external interfering installations.
• Optimization: Adjustable flange seal and alignment units (FAU40) are available to optimize radar beam direction.
• Weather Protection Cover: Recommended for outdoor use.
• Flooding Protection Tube: For free-field installations or risk of flooding; seals the system and defines maximum level detection.
• Mounting Bracket: Available for wall/ceiling installation and adjustable positioning.
• Cantilever Installation: Options for pivotable and adjustable mounting.

Environment

• Ambient Temperature Range: –40 to +80 °C (–40 to +176 °F). Bluetooth® connection may be affected above 60 °C (140 °F).
• Storage Temperature: –40 to +80 °C (–40 to +176 °F).
• Climate Class: DIN EN 60068-2-38.
• Operating Altitude: Up to 2000 m (6600 ft) above sea level.
• Degree of Protection: IP66, NEMA 4X; IP68, NEMA 6P (24 h at 1.83 m).
• Vibration Resistance: DIN EN 60068-2-64/IEC 60068-2-64: 20 to 2000 Hz, 1 (m/s²)²/Hz.
• Electromagnetic Compatibility (EMC): Complies with EN 61000 series and NAMUR Recommendation EMC (NE 21).

Process

• Process Temperature Range: –40 to +80 °C (–40 to +176 °F).
• Process Pressure Range (Threaded): pgauge = –1 to 3 bar (–14.5 to 43.5 psi); pabs < 4 bar (58 psi).
• Process Pressure Range (Flange): pgauge = –1 to 1 bar (–14.5 to 14.5 psi); pabs < 2 bar (29 psi).
• Dielectric Constant (for solids): εr ≥ 2.

Mechanical construction

• Dimensions: 80 mm (3 in) antenna dimensions provided for various configurations including with flooding protection tube and slip-on flanges (3"/DN80, 4"/DN100, 6"/DN150). Counter nut dimensions also provided.
• Weight: Approx. 2.8 kg (6.2 lb) for device with 80 mm antenna and 5 m cable.
• Materials:
  • Sensor housing: PVDF.
  • Seal: EPDM.
  • Process connection: PVDF.
  • Cable gland: PA.
  • Conduit adapter: CuZn nickel-plated.
  • Counter nut: PA6.6.
  • Design ring: PBT-PC.
  • Connecting cable: PVC.

Operability

• Operating Concept: 4 to 20 mA, HART. Menu guidance with explanations in operating tool. Optional SmartBlue app via Bluetooth®.
• Operation via Bluetooth® wireless technology: Remote operation possible with smartphone/tablet and SmartBlue app.
• Via HART protocol: Remote operation possible with PLC, power supply units, Commubox FXA195, RIA15 indicator, or computer with operating tool.

Certificates and approvals

• CE Mark: Meets applicable EU Directives.
• RoHS: Complies with Directive 2011/65/EU.
• EAC Conformity: Meets applicable EAC guidelines.
• RCM Marking: Meets ACMA requirements.
• Approvals: Includes certifications for non-hazardous areas and various hazardous area classifications (ATEX, CSA C/US, EAC Ex, IEC Ex, KC, INMETRO, NEPSI, TIIS). Additional safety instructions required for hazardous areas.
• Explosion-protected smartphones and tablets: Only mobile devices with Ex approval may be used in hazardous areas.
• Pressure Equipment: Instruments without pressurized housing do not fall within the scope of the Pressure Equipment Directive.
• EN 302729-1/2 radio standard: Complies with LPR radio standard for unrestricted use in EU/EFTA countries, with specific installation and site requirements, especially near astronomy stations.
• FCC / Industry Canada: Complies with Part 15 of FCC Rules and Industry Canada license-exempt RSS standards. FCC/IC IDs provided for various configurations. Installation by trained personnel required. Special restrictions apply for non-enclosed container use.
• Japanese Radio Law and Japanese Telecommunications Business Law: Device granted pursuant to these laws; certified number 202-LSF004.
• Mexico: Operating conditions stated for wireless module.
• Other standards and guidelines: Lists numerous IEC/EN and NAMUR standards related to safety, EMC, and field device requirements.

Ordering information

Detailed ordering information is available from Endress+Hauser sales organizations or the Product Configurator on their website.

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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