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Inline Sound Velocity Sensor:

  • media
  • media
  • +9
  • 360°
  • Perfect sound velocity sensor for inline concentration measurement, interface detection, product identification, and quality control
  • Robust, durable, precise
  • Wetted parts, even for the toughest chemical applications
  • No bypass, no pumps, no valves needed

Consisting of two types of sensors, our L-Sonic series builds on more than 30 years of experience developing sound velocity measurement technology. L-Sonic 5100 is a fork-type sound velocity meter, while L-Sonic 6100, a tube type meter, is tailor-made for high-precision OCR measurements.

Our sensors are made of wetted part materials, such as SST, Hastelloy, or Monel. From the chemistry, petroleum, and mining industries to the HVAC and beer ones, these easy-to-use sensors are used in industries all over the world.

Key features

Conduct highly accurate measurements

Conduct highly accurate measurements

  • Measure with repeatability up to 0.005 m/s for highly accurate results
  • Conduct measurements that are insensitive to gas bubbles
  • Measure even at flow rates at around 0 m/s- with high precision and reliability
  • Conduct high-precision temperature measurement for accurate formula compensation 
  • Get peace of mind: Changes in flow-rate, pressure, and viscosity don’t affect your results
Withstand tough environments with the sound velocity sensor’s robust design

Withstand tough environments with the sound velocity sensor’s robust design

  • Build your sensors from a range of high-quality materials:
    • 1.4404 stainless steel as high-quality standard fork material
    • Hastelloy as high-tech material for sulfuric acid and other harsh chemical environments
    • Monel alloy for potassium hydroxide (KOH) and saltwater applications
    • 24k gold and rhodium for the toughest situations
  • Get ex-d and hygienic certificates
  • Minimize downtime as the complete L-Sonic series is maintenance-free
  • CIP/SIP-ready and EHEDG certificate available
Integrate quickly and easily: No bypass, no pumps, no valves

Integrate quickly and easily: No bypass, no pumps, no valves

  • Integrate cost-efficiently and benefit from a great price-performance ration
  • Optimize project costs due to fast ROI
  • Install directly in a tank or in a pipe within seconds
  • Measure at flow rates at around 0 m/s- with the highest precision and reliability
  • Access customized flange connections and fork lengths for your requirements
Enjoy various adapters and cleaning solutions

Enjoy various adapters and cleaning solutions

  • Access a wide range of different adapter solutions for convenient and fast sensor integration
    • PTFE/ PFA coated T-pieces and adapters for chemical installations
    • Reductions and sample cups for integration in small pipe diameters
    • Transition adapters for sensor integration in large tank and pipe connectors 
  • Utilize several cleaning options that keep the fork clean without having to remove the sensor
    • Directly integrated cleaning nozzles for tank or kettle installations
    • Separated cleaning nozzles for flexible pipe installation 
Choose only the best sensor for your industry needs

Choose only the best sensor for your industry needs

Along with other industries, our sound velocity meters have been best engineered for:

  • Concentration measurement in the chemical and petroleum industry
  • Concentration measurement of rolling oil emulsions in the steel, aluminum, and copper industry
  • Phase detection and product identification for all industries
  • Product quality control for all industries
  • Wort measurement in the beer and brewery industry
  • Sugar concentration measurement
  • Ethanol concentration measurement
  • Oil Circulation Ratio (OCR) optimization for the automotive and HAVAC industry
Optimize OCR measurements with L-Sonic 6100

Optimize OCR measurements with L-Sonic 6100

  • Use L-Sonic 6100’s plug and measure system
  • Access our extensive formula portfolio, which has been developed over decades
    • Formulas for classical refrigerants (R-1234yf, R-32, R-134a, and many more)
    • Formulas for Propane (R-290) and CO2 (R-744)
  • Optimized for automotive companies, parts suppliers, research institutes, and various companies from the HVAC industry

Technical specifications

  L-Sonic 5100 L-Sonic 6100
Measuring range 800 m/s to 2500 m/s 200 m/s to 1560 m/s
Wetted parts material Stainless Steel 1.4404 (316L)
Monel 400
24k gold-coated
Stainless Steel 1.4404 (316L)
Fork length 56 mm, 125 mm (Standard) or customer-specific -
Repeatability*) sound velocity  0.005 m/s 0.01 m/s
Accuracy temperature 0.1 °C
Process temperature -25 °C to +125 °C
CIP/SIP temperature and duration 145 °C for max. 30 min.
Ambient temperature
(for non-Ex versions)
-25 °C to +65 °C without HMI
-20 °C to +55 °C with HMI
Process pressure absolute According to flange
Up to 70 bar @ 125 °C or
Up to 100 bar @ 50 °C
Recommended flow rate > 0 to 6 m/s 50 L/h to 700 L/h

Pico 3000:

Analog and Analog/Digital
Modbus RTU/TCP

mPDS 5:

Modbus TCP
I/O Board

Process connections VARIVENT® N
DIN 11851
EN 1092-1
ANSI B16.5
JIS B2220
Customer-specific – on request

Tube end OD 12 mm
Compression type fitting (12 mm, 1/2")
Compression type fitting with external thread (NPT 3/4", G 3/4")

Non-Ex version (L x W x H)
Ex version (L x W x H)
Standard fork length: 56 mm, 125 mm, or customer-specific design 149 mm x 142 mm x 147 mm
149 mmx 156 mm x 166 mm 

*) Measure of the accuracy of a single L-Sonic 5100/6100 sensor

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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Not all items are purchasable online in specific countries.

To find out if you can purchase online from your location, check the online availability below.


Compatible with:
L-Sonic 5100 | 6100
Online price only | excl.incl. 0VAT
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Part number: 74911