Applications - High Frequency Spark Vacuum Tester
The High Frequency Spark Tester services as a detector of leakages and pressure control on closed glass appliances like lamps, ampouls and windows (panes) Also the testing of porosity purity of non-conductive surfaces like glass, rubber, plastics or coatings is possible as well as surface insulation testing.

The amount of pressure, the filling degree and possibly the kind of gas are determined based on the luminous phenomena created. This is done without damaging the content or the glass, as only the gas inside is brought to luminescence.

Often there is a problem to test finished parts from a series production line in a non-destructive and reliable way. The High Frequency Tester provides a productive solution to this.

Testing of illuminants (lamps, bulbs)
The closeness and the gas filling degree of illuminants are tested. This way, the quality of the specific illuminant can be determined. Failures in the production process are quickly recognized and corrected at an early stage. Over and above the application in a bulk production (car headlights and fluorescent tubes) also niche markets can be served like manufacturers of neon signs.

Applications in the pharmaceutical industry
Many of the pharmaceutical products have a vacuum packaging. (ie. ampouls, bottles, cannisters) These packings are checked for closeness, leak tightness and presence of possible strange gases (i.e. particles of hydrogen)

Checking of insulation glass
In order to achieve the required value of heat transition of panes a certain degree of gas filling is required. This can be easily and quickly determined by this unit. The installation of this unit has already lead to alterations in the production process flow for the manufacturing of panes.

Checking of solar panels
The efficiency of solar panels and vacuum tubes is totally dependent on the quality of the vacuum or the gas filling. The quality of the vacuum is fully determinable and controllable with this unit. The quality level is upgraded.

         
   

Technical data

  • Vacuum work range app. 250 to 10-3 mbar
  • Gas, pressure range to 12 bar
  • High voltage approximately 50 to 60 kV
  • High frequency nominal capacity 5W
  • Spark gap max 30 mm
  • Power supply 230V (cat II) 50 Hz (60Hz)
  • Power consumption 30W
  • For indoor use
  • Altitude to 2000 m NN
  • Temperature range 5° to 40° Celsius
  • Maximum relative humidity 80% for temperatures to 31° linear decrease to 50% relative humidity at 40° Celsius
  • Power supply fluctuations not greater than 10% cont. level 2
  • Fusing 0.800 A MT
  • Housing 19“ stainless steel table enclosure with 3U and 10” front panel
  • EVM compatibility
  • CE certification acc. to EU regulations
 
         
   Base units & plasma evaluation systems  
 


HFT–00 (base unit)

Base unit for the excitation of a plasma with the aid of fixed parameters.
The power output is infinitely variable.

HFT-01 (base unit with change-over switch)
Base unit for the excitation of a plasma with the aid of fixed parameters.
The power output is infinitely variable. The modulation type of the high voltage can be switched over to positive electricity. Ignition reluctant gases are shifted into plasma in a quicker way.

HFT-06 (control unit, remote control and display)
Control unit for the creation of a plasma. Impulse creating parameters can be remote controlled by external units (i.e. SPS control) or by optimumly operating elements.

HFT-10 (plasma evaluation)
Evaluation system for the creation of a plasma, automatic evaluation of the illumination and result –focussed control of the peripheric facilities (i.e.production machinery). The integrated industry computer provides the documentation and filing of the recorded data.

HFT-20 (plasma evaluation in the lab model)
Evaluation system for the creation of a plasma, automatic evaluation of the illumination and result –focussed control of the peripheric facilities (i.e.production machinery). The plasma creating parameters are precisely adjustable over wide ranges. The integrated industry computer provides the documentation and filing of the recorded data.

HFT-22 (plasma eval and detection in the lab model)
Evaluation system for the creation of a plasma, automatic evaluation of the illumination and result-focussed control of the peripheric facilities (i.e. production machinery). The plasma creating parameters are precisely adjustable over wide ranges. The integrated industry computer provides the documentation and filing of the recorded data. Furthermore, the system has the availability of an independently working sensor, which can detect plasma extremely quickly in an even invisible range (near infrared until UV range) and can be used for the control of the unit.

 Click on the images of the units to download the technical specifications or contact us for more details, images and manuals.

  Click here to download the general HF tester brochure

  Click here to download the HF tester pricelist

 
         
 Description of testing procedure
 
The procedure is described using the high frequency test as an example. The measurement process is structured in accordance with the reference principle. A reference piece of the same type with the required properties and the test criteria is used for the reference measurement. For a vacuum this would be an evacuated test piece with negative pressure of 250 mbar for example. The ground of the test device is on the test-piece or is attached via fixing aid e.g. with a metallic counterpart that is opposite to the test probe. The power supply is switched to the lowest potentiometer setting and the test probe is placed on the non-conductive test sample surface. A discharge passing through the test sample can be detected. If at first there is no visible discharge the potentiometer must be set higher until a stabile spark gap is produced.

Please Note: due to the vacuum that will be tested, there should naturally be as little visible discharge as possible because an absolute vacuum that does not contain gases cannot be ionized, i.e. no currents can flow.

The induced discharge is based on a high-pass high voltage that is generated through a Tesla transformer. Since electromagnetic waves are only influenced and diverted by metallic objects, or by conductive objects in general, in this case the waves penetrate the non-conductive surface and the vacuum, until they are attracted by a good ground. En route through the vacuum the foreign particles contained are excited due to impact ionization and thus they create a conductive atmosphere. The emissions caused by the excited electrons falling back into the normal state of the particles are visible as light in their specific colors. The purer the vacuum the fewer emissions that can be seen. When testing gas-filled spaces with thin glass walls, select the lowest setting on the device and the high frequency voltage should be increased slowly until there is a visible discharge, otherwise the danger of breakdown exists due to the glass wall. An error would occur that did not exist prior to the test, and thus render the measurement as well as the test sample unusable.

         
 Unique Characteristics of the High Frequency Vacuum Spark Tester Systems
  • quick and precise evaluation using plasma creation with low energy
  • automatic operations or manual operation
  • suitable for production lines and industry
  • production process optimizing
  • detectibility of invisible plasma

The system consists of an electronical control unit, which produces a high frequent modulated high voltage.This is applied to the test product / piece by a special converter (check pistol or probe).

By the up-modulation of gas-depending, low to high frequent impulses on to the carrier frequency, even ignition reluctant gases can be put into the fourth status of aggregation. Thus, a plasma is also created from ionisation reluctant gases.

The particular advantage of this system is the avoidance of radiation, which allows a direct operation with the automatic system (recognition of plasma, computer etc.) Plasma, which the human eye does not recognize, is now recognized and evaluated.

With the aid of the automatic recognition it only needs a low energy supply into the test piece. A faint and gentle excitation is sufficient for the contents (i.e. vaccination sera) and for the glass.

Furthermore, other electronic devices or radio communication are not interfered. A healthy person can come into contact with high frequency un-intentionally and will not suffer from any health defect.The hand tools in the shape of a pistol can be used without any hesitation.

The detection of invisible plasma, which is able to detect and to evaluate it in second sequence.
An evaluation system of visible plasma, which is capable of detecting the color identity and the brightness in a comparative measuring method.
The testing parameters can be freely chosen. It provides informations on the consistence of the gas and also on the pressure conditions of the test piece.

The system has obtained certifications for TÜV (technical survey), CE and radio harmlessness and compliance with EU regulations and in the scope of science there is no comparative and competitive product in the market sceme.

Theses systems has been in use for several years and has proven its skills and reliability. Well known enterprises, universities, laboratories, health authorities are to use this system exclusively for the above mentioned reasons.