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Combined density and sound velocity sensor:
L-Com 5500

For concentration measurement of three-component mixtures

excl.incl. 0VAT
upon request
Purchasable online
in specific countries
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Part number: 181263
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L-Com 5500 represents Anton Paar’s new density and sound velocity sensor combination in one instrument for the measurement of 3-component mixtures. It consists of an L-Dens 7500 density sensor with a piezo-excited U-tube, which is expanded with a sound velocity module. Density and sound velocity values are directly calculated at the sensor electronics.

This fusion results in a high-end sensor with the highest accuracy on the market (5x10-5 g/cm³ for density measurement and 0.1 m/s for sound velocity measurement). It is ideal for the monitoring and controlling of chemicals such as formaldehyde-methanol-water mixtures and for the production control of beers, which are analyzed by their alcohol, extract, and water content.

L-Com 5500 uses digital signal processing and can be equipped with the new Pico 3000 transmitter and Pico 3000 HMI.

L-Com 5000 Version Ex is the explosion-proof version and specially designed for the measurement of flammable liquids in hazardous environments. 

Key features

Minimized costs – a single sensor for measuring 3-component mixtures

Minimized costs – a single sensor for measuring 3-component mixtures

The smart combination of process density and sound velocity sensors enables highly sophisticated concentration measurement with one single instrument.

Concentration determination of 3-component mixtures

  • Formaldehyde-methanol-water
  • Sucrose-inverted sugar-water
  • Alcohol-extract-water

With sensor dimensions of 260 mm x 145 mm x 200 mm (L x W x H) L-Com 5500 can be mounted in the smallest space using various process connections which are common and standard for all industries.

Benefit from in-house concentration formula development for your application, which is then integrated into your instrument.

Highest accuracy – reliable measurement under changing process conditions

Highest accuracy – reliable measurement under changing process conditions

The L-Com 5500 sensor combines the outstanding accuracy of L-Dens 7500 with the sound velocity measurement of L-Sonic.

L-Com 5500 stands for:

  • The highest accuracy on the market (5x10-5 g/cm3 for density measurement and 0.1 m/s for sound velocity measurement)
  • The highest accuracy measurement of process temperature to avoid process temperature influences
  • Hermetically sealed U-tube to withstand the humidity condensations resulting from temperature fluctuations between ambient and process conditions
  • Pressure-compensated measurement values due to the optional pressure sensor
  • Same process media conditions during the determination of both density and sound velocity due to measurement in one cycle

Unstable process conditions are compensated and changing process and environmental conditions have no impact on the performance of L-Com 5500.

Be flexible – inline, bypass, and tank installation

Be flexible – inline, bypass, and tank installation

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 without pump

For inline, bypass, and tank installations, L-Com 5500 can be combined with different Anton Paar pumps (Inline Pump 520, integrated sample pump) to ensure constant media flow through the sensor, guaranteeing stable measurement values.

For inline and bypass installations, standard process adapters without the need for a pump are available.

Save time – hassle-free right from the start

Save time – hassle-free right from the start

L-Com 5500 delivers reliable concentration measurement values right from the beginning. Delivered ready-to-use, including the required concentration formula, the sensor only needs the usual adjustment of the process to the laboratory values. 

  • Factory-adjusted sensors – ready-to-use
  • Integrated concentration formulas
Save money – low operating costs for the whole sensor lifetime

Save money – low operating costs for the whole sensor lifetime

You simply fit the sensor and can rely on concentration measurement at the highest accuracy over the entire working life of the sensor. No additional operating costs for consumables or maintenance have to be calculated, which enables you to keep competitive production costs.

  • Robust stainless steel housing
  • Maintenance-free
  • No consumables

Technical specifications

L-Com 5500
Process density max. 2000 kg/m3
Process sound velocity range 800 m/s to 2000 m/s
Standard adjustment range 700 kg/m3 to 1200 kg/m3
Material of the wetted parts Hastelloy C-276
Ex version
  • ATEX: 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
Accuracy in adjusted range 
Measurement uncertainty

Sound velocity:
Sound Velocity Mesurement

0.01 kg/m3 (1 x 10-5 g/cm3)
0.05 kg/m3 (5 x 10-5 g/cm3)
0.1 °C

0.01 m/s
0.1 m/s
0.02 °C
Process temperature (not Ex version)
-25 °C to 125 °C
CIP/SIP temperature and duration 145 °C for max. 30 min.
Ambient temperature (not Ex version)
  • 25 °C to 65 °C without Pico 3000
  • 25 °C to 55 °C* with Pico 3000
  • 20 °C to 55 °C* with Pico 3000 and Pico 3000 HMI
* Pico 3000 Version PROFINET IO max. 50 °C
Process pressure, absolute 50 bar
Recommended flow rate 100 L/h to 500 L/h
Communication Pico 3000:
  • Analog
  • HART
  • Modbus RTU

mPDS 5:
  • Devicenet
  • Ethernet/IP
  • Modbus TCP
  • I/O Board
Process connections
Options for integration:
  • Full flow
  • Bypass
  • Inline

  • DIN/EN
  • ANSI
  • Tri-Clamp
  • Varivent® N

Tube end:
  • OD 12 mm
  • OD 1/4”

  • G 3/8”
Dimensions (L x W x H) 258 mm x 142 mm x 178 mm
258 mm x 156 mm x 195 mm (Ex version)

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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