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Densimetry Meter for Brines DP-20


Density measurement of liquid de-icing agents

The density meter DP-20 developed by SOMMER Messtechnik detects the concentration of NaCl, CaCl2 or MgCl2 during brine production. It uses an oscillating U-tube and a dedicated transducer to determine the solution density. Through the unique relationship with density the salt concentration is derived. The DP-20 replaces the widely applied DP-10.


Features and advantages

  • Real-time measurement
  • In-line and bypass application
  • Digital outputs
  • Facilitates automated mixing
  • Covers wide range of salt solution concentrations
  • Robust construction for applications in demanding environmental conditions
  • Easy installation and operation


Density measurement made easy

Liquid de-icing agents are considered to be an ideal solution to cope with icy roads for a long time. The density meter DP-20 has been especially developed for the requirements of winter road services using brine. Other than the conventional, manual density measurement using a spindle, the DP-20 measures the concentration during the mixing process continuously and in real-time. Depending on the requirements, two device versions can be selected: A standard version (DP-20)  and aversion with an internal mixer controller (DP-20MR). Both instruments have analogue and digital outputs for data post-processing. Additionally, both versions can be equipped with an external display to view live data and to configure a main set of parameters.


Technical details

  • Measurment principle Oscillating U-tube
  • Measurment range 0.500 – 2.000 g/cm³
  • Resolution 0.002 g/cm³
  • Functions Determination of aqueous NaCl, CaCl2, MgCl2 concentrations
  • Analog output
    • Concentration, specific density (0 ... 10 V)
    • 4x Open-Collector (Pull-Down) Output, 0,25A @ 24 VDC
      1x 4 ... 20 mA (medium temperature)
      1x 4 ... 20 mA, 0 ... 20 mA or 0 ... 10VDC (density or concentration)
  • Digital output
    • 2x RS-485 (ASCII or MODBUS RTU)
    • 1x SDI-12
  • Power supply 10 ... 30 V DC/AC
  • Power consumption at 12 VDC 120 mA
  • Operating temperature -25 °C ... +50 °C
  • Medium temperature -20 °C ... +30 °C
  • Housing dimensions (L x W x D) 430 x 150 x 133 mm
  • Material oscillating U-tube stainless steel, corrosion resistant (DIN 1.4539)
  • Medium connection pipe Ø10 mm
  • Weight approx. 2.5 kg
  • Protection rating IP 65

Additional Info

  • Characteristics: stationary measuring system
  • Features: contacting measurement

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