Home / Additional equipment / For Crack depth meters / Special test block KO28-1 for crack measurement
- Description
- Exploitation
- Technical specifications
- Delivery set
Test block with 3 cracks KO28-1 is designed to test the operability of the Crack depth meter ET-28.
The sample is made of structural carbon steel.
Before each use of the device for measuring the depth of cracks on the product, it is necessary to check its operation on a control sample.
The main characteristics of Test block KO28-1:
- 3 cracks of different depths were simulated on the KO28-1 sample: 1, 2, and 5 mm.
- KO28-1 is included in the basic delivery set of the Crack depth meter ET-28 electro potential.
Before each use of the device for measuring the depth of cracks on the product, it is necessary to check its operation on a control sample.
Stages of crack depth measuring
- Setting of the “0” – measuring on fl awless location of the object.
- Measuring of crack depth – contact electrodes are located on the opposite sides of the crack, measurement result in mm is shown on the screen.
Requirements for control objects
- Surface roughness – below or equal to 40 Rz (10 Ra).
- Stable electric contact with the sensor electrodes.
| Crack depth | 1, 2, 5 mm |
| Crack width | 0,2 mm |
| Dimensions of sample of crack | 100х40х10 mm |
| Weight | 0,32 kg |
Special test block KO28-1 (1, 2, 5 mm) — 1 piece