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Concentration
measurement
of liquids
ECHOMETER 1076 K

Special development
for tasks in the chemical industry
Leaflet Technical Data
Order Info

Special probe for liquids

By means of a special probe immersed into the liquid the ECHOMETER 1076 K determines the sound velocity of the liquid, which is a measure of the substance concentration.
 
 Measuring principle of the ECHOMETER 1076 K
 
The ECHOMETER 1076 K is an instrument to measure the sound velocity of liquids.

The accompanying probe is designed like a cuvette and simply gets dipped into the liquid for measurement.
Each an ultrasound transmitter and a receiver are included in the probe. Their piezo elements are covered by a protective layer to prevent damage by chemically aggressive liquids to be measured.

Subject of measurement is the time that is required for the sound to run through a constant, defined path between transmitter and receiver being submerged in the liquid.

Then the sound velocity becomes calculated by the electronic evaluation unit and is shown on the display of the gauge.
 

Schematischer Prüfkopfaufbau
 
 Determination of concentration in liquids by means of ultrasound
 
The velocity of sound in a material is a material constant depending on its chemical nature. Every chemical compound has a different velocity of sound propagation. With binary systems the velocity of sound of the system changes characteristically depending on the composition. Fig. 1 shows this interdependence, using the compound methanol-water as an example.
 
Compound Methanol - Water
Fig. 1: Compound methanol-water
 
If the dependency of concentration is known (calibration measurement) you may determine the given composition by a measurement of the sound velocity.
The suitability of the device for use in the field of quality assurance of chemical products is shown by the the following application example. Subject of the examination was a commercially available anticorrosive as it is mainly used with cooling lubricants (for cutting metal processing).
 

Fig. 2: Commercially available anticorrosive
 
The sound velocity of some known liquids is compiled in the following table. With compound liquids it can be assumed that the determination of concentration by means of the measurement of sound velocity is the more promising the more the sound velocities of the individual (pure) components differ from each other.
 
Liquid Sound Velocity Temperature T Δcl/ΔT
  cl [m/s] °C m/s °C
Acetone117425-4,5
Ammonia166316-
Benzine116617-
Benzene129525-4,65
Butane/propane compound (2 bar) (6)87020-
Carbon tetrachloride94320-3,1
Castor oil147725-3,6
Chloroform100123,5-3,5
Diesel oil125020-
Dioxane (Diethylene dioxide)138020-
Engine oil (SAE 20 and 30)174020-
Ethyl ether100620-5,7
Ethanol120725-4,0
Ethylene glycol165825-2,1
Formic acid (HCOOH)128720-
Freon97320-4,3
Glyzerin192320-1,8
Heptane (n)116523-4,2
Hexane111323-
Kerosine129534-
Mercury145120-0,46
Methyl alcohol112120-3,3
Methylene chloride110920-
Methylene iodide97724-
Nitrobenzene147720-3,7
Nitrogen (N2)869-197-
Octane119220-4,2
Olive oil138132-
Oxygen (O2)911-183,6-
Paraffin oil142033,5-
Paraldehyde118620-
Pentane102020-
Perchlorethylene107020-
Paraffin139515-
Propyl alcohol123424-
Propyl alcohol, iso123124-
Sodium chloride solution 1 %148725-
Sodium chloride solution 25 %177025-
Spindle oil143125-
Sulfuric acid (H2SO4)144015-
Turpentine oil128027-
Tetrachloride ethane115528-
Tetrachloroethylene102728-
Toluol132023-4,3
Trichloroethylene104920-
Water H2O (distilled)149725+2,4
Water D2O (heavy)139925+2,8
Water (sea water)153125+2,4
Xylene, m132822-4,1
Zinc2700450-
Sound velocity of liquids
[1] Bergmann,L.:Der Ultraschall und seine Anwendung in Wissenschaft und Technik. VDI Verlag GmbH, Berlin NW7
[2] Anon, L.W. und R.C. Chivers: Thermal Effects in Dilute Suspensions. Ultrasonics, 28 (1990)
[3] Hütte: Taschenbuch der Werkstoffkunde (Stoffhütte). 4th Edition, Verlag W. Ernst & Sohn Berlin-München , (1967)
[4] Wheast, R.C. (Editor): Handbook of Chemistry and Physics. 58th Edition, CRC Press, Cleveland Ohio (1977)
[5] Sutilov, V.A.: Physik des Ultraschalls. Springer-Verlag, Wien NewYork (1984)
(6) Lab measurements KARL DEUTSCH company

The sound velocities of the table apply at the temperatures stated there.

 Scope of delivery / ordering information
 
The gauge is delivered as a ready-to-operate complete set. It comprises:
  • Gauge ECHOMETER 1076.012
  • US probe 1498.023
  • Batteries
  • Carrying box
  • Instruction manual
  • 2 beakers, 100 ml each
  • Temperature meter "Checktemp"
  • PC assisting software tool "KonzBest" for calibration and documentation (to be installed under Windows®)
The following is available as separate accessory:
  • Separate US probe (order no.: 1498.023)
  • NiMH battery set, 2 pcs. (order no.: 6016.001)
  • Charger unit 230 V for NiMH batteries (order no.: 6015.001)
  • PC software "EasyExport" (order no.: 2905.001)
 

Current Dates


13 - 17 November 2017
15th APCNDT, Singapore

16 - 20 April 2018
Tube 2018, Duesseldorf

24 - 27 April 2018
32nd Control, Stuttgart

11 - 15 June 2018
12th ECNDT, Gothenburg

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