Micropilot FMR20B

Summary

Product identification

• Product: Micropilot FMR20B HART
• Type: Free-space radar
• Document: TI01796F/00/EN/03.24-00, 71687478, 2024-12-09

Application

• Continuous, non-contact level measurement of liquids and bulk solids
• Maximum measuring range up to 30 m (98 ft)
• Flow measurement in open channels or weirs with totalizer

Operating limits

• Process temperature: –40 to 80 °C (–40 to 176 °F)
• Process pressure: –1 to 3 bar (–14 to 43 psi)
• Operating height: Up to 5,000 m (16,404 ft) above sea level

Feed water

• Relative permittivity for liquids: εr ≥ 1.8
• Relative permittivity for bulk solids: εr ≥ 1.6

Product water

• Accuracy: Up to ± 2 mm (0.08 in)

Electrical

• Output signal: 4 to 20 mA with superimposed digital communication protocol HART, 2-wire
• Supply voltage: 12 to 30 VDC
• Power consumption:
  • Non-hazardous area: Max. 500 mA
  • Hazardous area: Max. 100 mA (in intrinsically safe circuit)
• HART specification: 7.6
• HART load: Min. 250 Ω

Mechanical / hydraulic

• Degree of protection: IP66/68 / NEMA Type 4X/6P
  • IP68: 24 h at 1.83 m (6.00 ft) under water
• Weight:
  • 40 mm (1.5 in) antenna: approx. 0.5 kg (1.1 lb) (including 5 m cable)
  • 80 mm (3 in) antenna: approx. 0.7 kg (1.5 lb) (including 5 m cable)
• Materials:
  • Antenna end process connection: PVDF
  • Sensor housing/Cable entry process connection: PBT/PC (PC for dust ignition-proof)
  • Counter nut: PA6.6
• Connecting cable:
  • Available length: 5 to 300 m (16 to 980 ft)
  • Material: PVC (or Halogen-free XLPE for marine approval)

Performance characteristics

• Reference conditions: As per IEC 62828-2
• Response time (damping off):
  • Measuring rate ≤ 250 ms at 24 V
  • Step response time < 1 s
• Warm-up time: ≤ 30 s
• Maximum measurement error (Accuracy):
  • Liquids: Up to 0.25 m: max. ±10 mm (±0.39 in); > 0.25 m: ±2 mm (±0.08 in)
  • Solids: Up to 0.8 m: max. ±20 mm (±0.79 in); > 0.8 m: ±4 mm (±0.16 in)
• Influence of ambient temperature:
  • Digital output (HART): Average TC = ±2 mm (±0.08 in)/10 K
  • Analog (current output): Zero point TC = 0.02 %/10 K; Span TC = 0.05 %/10 K
• Vibration resistance: 1.25 (m/s²)²/Hz, ~5 g (5 to 2,000 Hz)
• Electromagnetic compatibility (EMC): Max. measured error < 0.5 % of span

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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