NM014421001

The Crack depth probe RMSL-S 0° is a straight (0°) probe designed for measuring the depth of surface-breaking cracks in electrically conductive materials, primarily metals. It utilizes the AC potential drop (ACPD) technique, which involves introducing an alternating current into the workpiece and measuring the voltage drop across the crack. The change in potential is directly related to the depth of the crack.

The key features of this specific probe include:

• 0° Orientation: This indicates a straight probe design, where the sensor elements are aligned to measure cracks perpendicular to the probe's orientation on a flat or slightly curved surface.

• RMSL-S Designation: This likely refers to a specific design or series of probes offered by the manufacturer (KARL DEUTSCH in this context), possibly indicating the arrangement and type of contact pins or the probe's physical dimensions.

• Incl. Contact Magnet: The probe comes equipped with an integrated or external contact magnet. This magnet serves to securely hold the probe in place on ferromagnetic materials during the measurement process, ensuring consistent contact and reliable readings, especially on vertical or inverted surfaces.

• Cable: The probe includes a cable for connecting it to the main unit of the crack depth meter (e.g., the RMG 4015). This cable transmits the electrical signals necessary for the measurement.

How it likely works (based on the ACPD method and the RMG 4015 system):

1. Current Introduction: The probe has contact pins that introduce a controlled alternating current into the metallic workpiece on either side of the crack.

2. Potential Measurement: Other contact pins on the probe measure the voltage drop (electrical potential difference) across the crack.

3. Depth Correlation: The crack depth meter (like the RMG 4015) analyzes the measured potential drop. The presence of a crack increases the electrical resistance, and the magnitude of this increase is proportional to the crack depth. The instrument uses pre-calibrated material characteristics to convert the potential drop reading into an estimated crack depth.

4. External Magnet Advantage: The contact magnet ensures that the probe maintains consistent and firm contact with the material surface, which is crucial for accurate and repeatable ACPD measurements, especially when dealing with different orientations or potentially uneven surfaces.

Applications:

This type of probe is typically used in conjunction with visual inspection (VT), magnetic particle testing (MT), or penetrant testing (PT) to quantify the depth of detected surface cracks in various metallic components, such as:

• Welds

• Pipes and pressure vessels

• Machinery and structural components

• Automotive and aerospace parts