Truedyne DLO-M2 Density Sensor for liquids



  • High-Precision Measurement
  • Compact Design
  • Perfect for Measuring media such as petrol, diesel and methanol

TrueDyne DLO-M2 for Liquids

The DLO-M2 sensor measures the density of liquids in a microelectromechanical system (MEMS system). Within the MEMS system, the liquid is directed to an omega-shaped microchannel, the so-called omega chip. This tiny silicon tube – it is hardly thicker than a hair – is set into oscillation for the measurement. The density of the medium can be derived from the natural frequency of this oscillation: the denser the medium, the lower the oscillation.

Thanks to the measurement in the MEMS system, the sensor is only 30 x 80 x 15 mm in size and can be accommodated even in tight spaces. The high-precision measurement results are immediately available, allowing continuous measurement during the process. The density of liquids depends on their temperature. To compensate for this effect, an integrated platinum resistor detects the temperature of the liquid.

The density sensor sends the measured data to the readout system via the data line in Modbus RTU transmission mode.

Features of the TrueDyne DLO-M2 Density Sensor for Liquids include:

  •  Density sensor DLO-M2(_ex)
  • 2 Mounting holes for mechanical fastening (6 x M3 threaded holes)
  • 3 Fluid interface (2 x M5 threaded holes)
  • 4 Clamp on grounding plate with screws M3×6 TORX
  • 5 Electronic interface for communication and power supply


Manufacturer: TrueDyne

Part Ref: DLO-M2


Liquid: Chemical, Clean Water, Diesel, Demineralised Water, Dirty Liquids, Dirty Water, Fuel & Oil, Food and Pharmaceuticals, mineral oils and alchols, Non-Aggressive Chemicals, Oil, Petroleum, Water

Media Type: Liquids

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Specification Detail of the DLO-M2 Density Sensor for Liquids:

Material Body:

Stainless Steel

Operating Temp: Range

-40°C to +60°C

Weight of Sensor


Permissible density measuring range:

600…1,000 kg/m³ (option 0…1,200 kg/m³)

Permissible viscosity range:

0.3…5 mPa s (option 0.3…50 mPa s)

Permissible pressure of medium:

0…20 bar (abs)
Burst pressure: 80 bar (abs)

Permissible particle size:

Max. 30 μm

Permissible flow rate range:

0…10 l/h (water)


Vibrations (<20 kHz) have no influence on the measuring accuracy due to the high working frequency of the microchannel.


Inlet and outlet sections:

Inlet and outlet sections have no influence on the measuring accuracy.

Typical media:

  • Gasoline, diesel, kerosene
  • OME (synthetic materials)
  • Oils and lubricants
  • Water-based media
  • Methanol, ethanol, isopropanol
  • LPG
  • AdBlue®
  • Glycol mixtures

Other media can be used after individual clarification individual


Continuous, without the need for an external command.
On hardware standard RS485.
Proprietary Modbus RTU communication protocol


CE mark – The density sensor meets the legal requirements of the EC directives. TrueDyne Sensors AG confirms successful testing of the density sensor with attachment of the CE mark.