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Combined density and sound velocity sensor:
L-Com 5500

  • Highly accurate, all-in-one density and sound velocity sensor
  • Perfectly suited for the measurement of 3-component mixtures
  • Minimized effort and costs for tank or pipe installations
  • Easy commissioning and handling, no consumables, no maintenance
  • Explosion-proof version available
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Part number: 181263
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L-Com 5500 is Anton Paar’s smart density and sound velocity sensor combination in one instrument for the measurement of 3-component mixtures – with market-leading accuracy of 0.05 kg/m³ for density measurement and 0.1 m/s for sound velocity measurement.

It’s ideal for monitoring and controlling 3-component chemicals, such as formaldehyde-methanol-water mixtures, or for the production control of beers – analyzed by their alcohol and extract content.

The modular design of the instrument, with its wide range of accessories for pipe and tank installations, minimizes integration efforts and costs, even in hazardous environments.

Key features

3-component concentration measurement with only one instrument

3-component concentration measurement with only one instrument

L-Com 5500 is a smart combination of the L-Dens 7500 density sensor with a piezo-excited U-tube and the sound velocity measurement of L-Sonic. This fusion brings you a high-end sensor with the best accuracy on the market (5 x 10-5 g/cm³ for density measurement and 0.1 m/s for sound velocity measurement). The integrated high-precision temperature measurement allows real-time following of process changes.

Concentration determination of 3-component mixtures is necessary for:

  • Formaldehyde-methanol-water
  • Sucrose-inverted sugar-water
  • Alcohol-extract-water
Flexible solutions for all your process environments

Flexible solutions for all your process environments

Different options are available for all types of process installations and can be integrated easily and cost-efficiently:

  • Inline, bypass, and tank installation with integrated pump
  • Inline and bypass installation with standard or customized adapter

For inline, bypass, and tank installations, L-Com 5500 can be combined with different Anton Paar pumps (Inline Pump 520 or Inline Pump 300) to ensure constant media flow through the sensor, guaranteeing stable measurement values. For inline and bypass installations, we offer standard process adapters or customized adapters without the need for a pump.

L-Com 5500 is also available in an explosion-proof version, specially designed for the measurement of flammable liquids in hazardous environments. The sensor can also be combined with the new Inline Pump 300 Ex d to guarantee high-precision measurement in tanks or under strongly fluctuating process conditions. 

Save time – hassle-free operation right from the start

Save time – hassle-free operation right from the start

L-Com 5500 delivers reliable concentration measurement values straight away. Delivered ready to use, including the required concentration formula, the sensor only requires the usual adjustment of the process to the laboratory values. 

  • Factory-adjusted sensors – ready to use
  • Integrated concentration formulas
  • Maintenance-free
  • No consumables
Profound application expertise and customized formula development

Profound application expertise and customized formula development

Not sure how to best measure the concentration of your product?  Anton Paar has a comprehensive database of applications for all major industry sectors (e.g., chemicals, petroleum, and beverages). We also offer customized formula development for your specific product.

Technical specifications

Max. density2000 kg/m³
Sound velocity range800 m/s to 2000 m/s
Standard adjustment range700 kg/m³ to 1200 kg/m³
Process temperature (non-Ex sensor)-25 °C to +125 °C (145 °C for max. 30 min)
Ambient temperature (non-Ex sensor)-25 °C to +65 °C (without Pico 3000)
Max. process pressure absolute50 bar
Recommended flow rate100 L/h to 500 L/h
Repeatability density0.01 kg/m³

Accuracy density

0.05 kg/m³
Repeatability sound velocity0.01 m/s
Accuracy temperature0.1 °C
Material of the wetted partsAlloy C-276
Recommended flow rate100 L/h to 500 L/h
CommunicationAnalog, HART, Modbus RTU, PROFIBUS DP, PROFINET IO, DeviceNet, Ethernet/IP, Modbus TCP
Process connectionsMany options for tank, inline, and bypass installation
Ex versionATEX: Ex II 2G Ex db IIB T4/T5 Gb
IECEx: Ex db IIB T4/T5 Gb
CSA/UL/FM: Class I Division 1 Gr CD T4/T5, Ex db IIB T4/T5 Gb, Class I Zone 1, AEx db IIB T4/T5 Gb
Dimensions (L x W x H)258 mm x 142 mm x 192 mm
258 mm x 156 mm x 214 mm (Ex version)
WeightApprox. 5.3 kg

Anton Paar Certified Service

The Anton Paar quality in service and support:
  • More than 350 manufacturer-certified technical experts worldwide
  • Qualified support in your local language
  • Protection for your investment throughout its lifecycle
  • 3-year warranty
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