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Process density sensor:

  • +1
  • 360°
  • Concentration measurement with process density meters
  • Low operating costs: Maintenance-free, no consumables required
  • Easy to integrate with minimal engineering efforts and cost
  • Models available for hazardous areas and hygienic applications
  • Comprehensive database for concentration formulas available
  • Specially designed for the petroleum industry
  • Robust design for hazardous environments 
  • 4-digit accuracy of 5 x 10-4 g/cm3
  • Easy commissioning and handling, no consumables, no maintenance
  • Exclusively available as Ex version

Anton Paar has more than 40 years of experience in process density measurement. So the L-Dens oscillating U-tube density sensor is more than just a cutting-edge instrument, it’s a decades-long story of core, real-world experience. This all-in-one solution combines pin-point accuracy, a compact, robust design, and easy integration – making L-Dens best-in-class for precise density and concentration measurement across a whole spectrum of industries and applications. 

Key features

Real-time, top-precision concentration measurement

Real-time, top-precision concentration measurement

The L-Dens process density sensors come with 4-digit accuracy (L-Dens 7300 Petro, L-Dens 7400) and 5-digit accuracy (L-Dens 7500), and the integrated, high-precision temperature measurement (pressure measurement optional) lets you follow process changes in real-time. The density sensors cover a wide range of applications and industry requirements across these sectors:

  • Chemical industry
  • Petroleum industry
  • Pharmaceutical industry
  • Ethanol industry
  • Beverage industry
High resistance, flexible installation, stable values, low costs

High resistance, flexible installation, stable values, low costs

The L-Dens density sensors are resistant to aggressive media – wetted parts comprise a variety of different materials. Whether you’re looking for inline, bypass, or tank installation, Anton Paar offers a comprehensive selection of adapter solutions across all industries. We also offer customized solutions, too. 

L-Dens 7000 is also available in an explosion-proof version specially designed for the measurement of flammable liquids in hazardous environments. The sensors can also be combined with the new Inline Pump 300 Ex d to guarantee high-precision measurement in tanks or under highly fluctuating process conditions. 

Anton Paar’s L-Dens series:

  • Can be used in hazardous environments
  • Can be exposed to extremely aggressive chemicals
  • Can be installed as follows: inline, bypass, tank
Pre-configured – no maintenance or consumables

Pre-configured – no maintenance or consumables

The L-Dens 7000 density sensors require neither maintenance nor consumables. Preconfigured and adjusted in the factory, they come with the right sensor setup and application formulas, tailored to your needs. Start up quickly – and start measuring right away.

We tell you how best to measure your sample

We tell you how best to measure your sample

Don’t know how best to measure the concentration of your liquid? We’ll tell you. Anton Paar has a comprehensive database as well as application know-how from across industries (e.g., chemicals, beverages, petroleum). In our in-house laboratory, we measure customer-specific samples and develop a tailored formula just for you. We suggest the measuring method (density, sound velocity, or refractive index) that’s most suitable for your sample, desired concentration, and temperature range.

Technical specifications

  L-Dens 7300 Petro L-Dens 7400 L-Dens 7500
Process density max. 1500 kg/m3 max. 3000 kg/m3 max. 2000 kg/m 3
Standard adjustment
600 kg/m3 to 1200 kg/m3
Material of the wetted
Stainless steel 1.4404 (316L) Stainless Steel
1.4404 (316L)
Hastelloy C-276
Incoloy 825
Hastelloy C-276
Metrological data in the adjusted range
Repeatability density
Accuracy density
Accuracy temperature

0.2 kg/m3
0.5 kg/m3
0.1 °C

0.02 kg/m3*
0.1 kg/m3**
0.1 °C

0.01 kg/m3
0.05 kg/m3
0.1 °C
Process temperature -40°C to 125 °C
CIP/SIP temperature and duration 145 °C for max. 30 min.
Ambient temperature
(for non Ex versions)
-40 °C to 70 °C without Pico 3000
-40 °C to 70 °C* with Pico 3000
-20 °C to 60 °C with Pico 3000 and Pico HMI
  *) Pico 3000 Version PROFINET IO, EtherneNet/IP, Modbus TCP: max. 60 °C
Process pressure absolute max. 50 bar max. 50 bar

High-pressure version
(only available in Hastelloy C-276):
max. 180 bar @ Tprocess ≤ 70 °C,
max. 140 bar @ Tprocess ≤145 °C,
CRN max. 170 bar
max. 50 bar
Recommended flow rate 100 L/h to 500 L/h
Communication Pico 3000:
  • Analog
  • HART
  • Modbus RTU
  • Frequency

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”

Others on request
Non-Ex version (L x W x H)
Ex version (L x W x H)

245 mm x 160 mm x 205 mm

245 mm x 145 mm x 185 mm
245 mm x 160 mm x 205 mm

190 mm x 145 mm x 185 mm
190 mm x 160 mm x 205 mm

Explosion-proof versions according to ATEX / IECEx / FM / UL / CSA
* Tantalum 0.05 kg/m³, ** Tantalum 0.5 kg/m³

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

Online price only | excl.incl. 0VAT


Compatible with:
L-Dens 7300 Petro Ex d | 7400 | 7500
Delivery time: %1$s – %2$s working days %1$s – %2$s weeks %1$s – %2$s months
Part number: 74911


Compatible with:
L-Dens 7300 Petro Ex d | 7400 | 7500
Delivery time: %1$s – %2$s working days %1$s – %2$s weeks %1$s – %2$s months
Part number: 77514