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  AV1 Hydrogen Analyzer for Aluminum Alloys


Hydrogen-in-Aluminum Test

Operating Principle of the Analyzer

Technical Data

Configuration of the analyzer and its auxiliary equipment



Hydrogen-in-Aluminum Test

AV-1 Hydrogen Analyser   At the present time there are two widely using technologies of hydrogen concentration measuring in aluminium. Testing of the hydrogen concentration in solid samples of aluminum alloys is possible using vacuum heating/melting methods or instrumental methods.

 The instrumental methods are based either on measuring the alloy density and comparing the measured density to the reference density, or on the analysis of concentration of hydrogen escaping into a spectral-pure nitrogen flow during the sample heating.

 These methods have an inherent drawback related a very small quantity of hydrogen in a sample (about 4 mm3). For a quantity of nitrogen of about 1 L, the hydrogen concentration will be about 4 ppmv. It is difficult to measure such a concentration. It should be noted that spectral-pure nitrogen contains about 100 ppmv of impurities, which are unknown in advance, and which hydrogen may react to and mix with.

 The vacuum methods are free of this drawback. In a vacuum under the pressure of 100 mPa, the hydrogen volume increases one billion times, from 4 mm3 to 4m3. Such quantities are easy to record.




Operating Principle of the Analyzer

  Our Analyzer is a special highly sensitive magnetic mass spectrometer tuned to record hydrogen, and provided with a digital recording system for mathematical processing of measurement results, and with an extraction/loading assembly for high-temperature recovery of hydrogen from aluminum samples.

  The operating principle of the instrument is based on measuring of the quantity of hydrogen escaping from a sample weighing 0.2-7 g when heated to a temperature close to the melting point (vacuum heating), or when melted in vacuum (vacuum melting).

  Due to a special design, the sensitivity of our analyzer is one thousand times higher than with standard mass spectrometers.

 The high sensitivity enables hydrogen concentration testing in samples weighing 200 mg or less. Surface hydrogen may be precisely isolated from the general mass on the monitor screen.

 The AV-1 enables analyzing hydrogen concentrations in any aluminum alloys (containing Li, Mg, Sr, Pb, etc.).

 The experience of the instrument operation for 20 months at KUMZ aluminium factory in Kamensk-Uralsky and at VILS (Central Institute for Light Alloys) in Moscow confirms a good recurrence rate of analysis results. According to VILS conclusion, AV-1 fully complies with GOST 21132.1-98.

 The calibration device developed by us allows to greatly reduce the consumption of standard samples.

 While the performances of AV-1 are higher, its price is lower than that of other known hydrogen analyzers.

 As a high-sensitivity analyzer, the instrument may be used to test the hydrogen content in gaseous, liquid, and solid matter. So if there are unsolved problems with H-testing, or there is need in high-precision measurings, contact the creators of AV-1.

 The analyzer is designed for continuous round-the-clock operation, and may be used as a high-sensitivity sensor to test the gaseous hydrogen content in metallurgy and in the electronic industry, in hydrogen generator maintenance, and for hydrogen leak detection in the chemical, food, oil refining, motor, and aerospace industries.


Technical Data


  The analyzer tests the hydrogen content in aluminum alloys with hydrogen contents of 0.01 n.cm3/100 g and higher, for sample weights of 0.2 to 7 g;

  Methods of measurement: vacuum heating, vacuum melting;

  Hydrogen content measurement error: within 3%;

  Minimum recordable hydrogen flow: 20 mm3Pa/s;

  The analyzer is fully automated and provided with protective interlocks, but may be controlled manually;

  The analyzer is provided with a digital recording system enabling mathematical processing of measurement results and data transmission by RS232;

  The analyzer will be ready to operate to its specified performances in 50 minutes after it is activated;

  Duration of one analysis: from 15 to 45 minutes;

  The instrument allows for unlimited continuous operation within the time between failures;

  The instrument will retain its performances within the specified rates when power supplied from 3-phase AC mains of 220/380 V, 50 Hz, with tolerable deviations within +10 -5%;
Power consumption: not to exceed 1 kVA;
 Dimensions, mm, not to exceed:

    vacuum system, 398 x 672 x 470;

    recorder, 270 x 325 x 338;

    extraction unit, 440 x 500 x 470.
  Total weight, kg, not to exceed: 95.
  Time between failures: at least 3,000 hours.



Configuration of the analyzer and its auxiliary equipment


   The basic vacuum heating analyzer set comprises:

   1. Vacuum system with a digital recording system, a Hydrogen Leak calibration device, and a UR-14 unit;

   2. Vacuum heating extraction/loading unit designed by NPK EPT comprising:

   2.1. non-cooled vacuum trap with an air cooling lap surface;

   2.2. quartz glass extractor lapped to the lap surface, and two additional quartz glass plugs lapped to the lap surface;

   2.3. electric surface for radiation heating of the extractor, with an assembly for mounting on the vacuum system frame;

   2.4. furnace temperature stabilizing regulator;

   3. EPSON LX-300+ printer;

   4. Set of connecting cables;

   5. Tools & Spares Kit;

   6. Technical description of the AV-1 analyzer;

   7. Manual for analysis procedures, maintenance and repair of AV-1;

   8. Containers.

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(c) ООО NPK EBT 2002
designed: Tsvetkov Evgeniy