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QB Foam & Liquid Level Sensor, angled view

Sensors and data acquisition

QB Foam & Liquid Level Sensor

Product number FSN-001

Non-contact optical sensor that measures liquid level and foam thickness through glass or plastic vessel walls.

  • Non-contact
  • 1–40 cm range
  • Clamps onto the vessel
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What it does

  • No contact with the process — mounts outside the vessel wall
  • Tool-free extension modules adjust the measuring range
  • Proprietary foam detection (patent pending)

Requires

Key specifications

Measuring range
1–40 cm, ±0.5 cm
Measures
Foam level and liquid level
Interface
Modbus RTU RS-485 (M8, with M12 adapter)
Power
24 V DC, max 500 mA
Dimensions
76 × 44 × 36 mm (with connector)

Interfaces, panels, supported sensors and all specifications are in the full PDF catalog.

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Full PDF catalog

Get the complete QB Modules catalog

The online catalog shows the essentials. The PDF (72 pages, edition 09.2026) has the full technical detail. We email you the download link straight away.

  • Full specifications, front and back panels for every QB Module
  • Supported Hamilton, Mettler Toledo and Levitronix sensors
  • Tanks, vessels and accessories
  • QB Foam & Liquid Level Sensor and sample handling