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Liquid Penetrant Testing
The dye penetrant method is always applied when the material is not ferromagnetic and therefore the magnetic particle testing method cannot be used.
In a first step the object to be inspected must be cleaned thoroughly (1 and 2).

After thorough cleaning of the surface a (most often) red liquid (dye penetrant) is dispersed on the inspection area. Due to capillary action the liquid penetrates into existing cracks (3).

After a penetration time of approximately 10 minutes (the time depends on the material type and defect size to be detected) the surface is carefully cleaned again. The penetrant must remain in the cracks (4).

Then a white developer is sprayed as a thin film on the surface (5) which “sucks” the penetrant out of the crack (6). This usually takes approx.10 minutes again.


Due to the high contrast between the red penetrant and the white developer, cracks are clearly indicated. The penetrant can also contain fluorescent pigments which generate bright indications with a high contrast under ultraviolet light (UV light).

The three chemicals (penetrant, cleaner and developer) form one test system. According to the standards, only approved tested systems are allowed and should undergo the approval on an external laboratory. An exchange of one chemical within one test system by another chemical of another test system is not accepted.

The method also works if the objects are immersed in a tank for every inspection step. This enables an automated test procedure. However, the final evaluation is usually done visually by the operator. Under certain circumstances the method can also be applied for leak testing (common abbreviation LT). For this purpose the penetrant is sprayed on one side and the developer on the other side of the object. Leakages then are indicated where the penetrant appears on the developer side.
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Dye Penetrant Testing

Penetrant testing is based on the capillary action at defects which are open to the surface, as e.g. with cracks, and is a comparably easy examination method: After spraying the testing agent penetrates into the crack due to the capillary action. Then, after the successive intermediate cleaning the developer becomes sprayed on. After drying the developer draws the penetrant from the crack and the indication widens. The trace of the crack becomes visible within a few minutes.
 
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Stationary Systems
  • The KD-CHECK stationary system is designed for liquid penetrant testing of small and medium-sized components. Each step like pre-cleaning, penetrant dwell, penetrant removal, developing and evaluation can be done here. It is suitable for both single component and small series testing.
  • The KD-CHECK stationary system is equipped with an explosion protected waste air fan. That way the emission of mist and explosive gases (cleaner, propellants) is reduced to a minimum. The lighting, also explosion protected, provides a sufficient light intensity.
  • Excess penetrant and waste-wash-water are collected in the active-carbon water-treatment-unit placed under the working area. The regenerated water can be reused for penetrant removal.
 
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Semi-Automatic Systems :

The KD-CHECK stationary system is designed for liquid penetrant testing of small and medium-sized components. Each step like pre-cleaning, penetrant dwell, penetrant removal, developing and evaluation can be done here. It is suitable for both single component and small series testing.

The KD-CHECK stationary system is equipped with an explosion protected waste air fan. That way the emission of mist and explosive gases (cleaner, propellants) is reduced to a minimum. The lighting, also explosion protected, provides a sufficient light intensity.

Excess penetrant and waste-wash-water are collected in the active-carbon water-treatment-unit placed under the working area. The regenerated water can be reused for penetrant removal.

A switchbox provides the easy use of lighting, waste air fan and wash-water pump, and there are additional connections for hot air dryer, UV-lighting or digital cameras, too.

Customized dimensions and specific features are possible on request.
 
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Reference test blocks for penetrant testing

For color penetrant testing plenty of reference test blocks are available, each based on the different German and foreign standards. We offer you a great selection of reference test blocks and are pleased to help you in case of questions.
  • Test Block 1 according to DIN EN ISO 3452-3 (JIS Reference Body)
  • Test Block 2 according to DIN EN ISO 3452-3
  • Aluminium test panel according to ASME and DIN EN ISO 3452-4+5
 
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UV LED large area lamp

Depending on the required lighting intensity and the lighting type multiple large area lamps can be connected in series and offer the possibility to switch between UV light and white light by just a push of a button.

The UV high power UV LED's of the lamp have an highly extended service life and thus a change of the illuminants usually is not required.

The used LED's have a UV A irradiation with a strict limitation to a wave length of 365 nm. Hazard by UV B / UV C irradiation thus is nearly impossible, even with defective protection glass. The LED technique renders filter glass redundant.
 
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UV LED Combi Hand Lamp

  • The portable hand lamp for mains and battery operation
  • A quantum leap for the generation of mobile UV light used for penetrant and magnetic particle inspection
  • Instead of conventional glow-discharge bulbs, four light-weight and insensitive high-power UV LEDs with more than 10,000 hours operating time are used.
  • Another white light LED, which is located in the front centre permits to change to white light mode simply by pressing a momentary push button.
  • The lamp is ready to operate immediately after power-on, provides a high UV intensity and a uniform distribution of intensity.
  • The grading into risk class 2 (according to the German standard EM 6) meets the requirements of working safety for a low UV radiation exposure.
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