Whether you want to evaluate the extension, orientation or inclination angle of a crack, or if you want to monitor the growth of a crack without increasing operation time, the Karl Deutsch RMG 4015 Crack Depth Meter has what you're looking for. The RMG 4015 is designed to measure crack depths on workpieces made of steel, iron and austenite, but can also be used to measure cracks on copper, brass, aluminum and most non-ferrous metals as well. Special probes are available for the measurement of inclined cracks. It is battery-operated and compact, making it highly portable, and with a wide variety of accompanying probes to choose from, the RMG 4015 has a solution, whatever your application.
The RMG 4015 uses the electrical potential principle: A probe with four spring-loaded and gilded contact pins is positioned across the crack to be measured on the workpiece. A constant alternating current is passed via two of the pins into the workpiece; the two other pins measure the voltage drop across the crack from which the depth of the crack is derived. The alternating current of the instrument utilizes the skin effect, which forces the current to follow the surface of the conductor and therefore, follows the contour of the crack. The operation and measured value formation are monitored by the microprocessor of the gauge.
Shown here with RMSL Probe used for measuring oblique cracks
For Oblique cracks, the instrument is equipped with an additional measuring function for the determination of oblique cracks, which helps determine the inclination of the crack with respect to the material surface. The measurement is executed by means of a special four-pin probe, which allows you to connect an external current pole to be positioned to the left or right of the crack. Via the differences of the readings and the crack depth measured, the meter will determine the inclination and the projection perpendicularly to the surface.
Standard Probe RMSQ 0°
#4418.001
Square arrangement of the pins for measurement of normal cracks at difficult to reach locations.
Includes 1 spare contact pin (standard pin).
Standard Probe RMSL 90°
#4417.001
90° right angled probe with linear arrangement of contact pins for measurement of normal cracks (e.g. inside of bore holes or inside of tubes). Includes 1 set of spare contact pins (standard pins).
Standard Probe RMSL-S 0°
#4421.001
Linear arrangement of contact pins for measurement of inclined and normal cracks. The design of the probe allows for measurement of difficult to reach locations. Includes external magnet as 2nd current pole, cable and 1 spare set of contact pins (standard pins).
Standard Probe RMSL-S 90°
#4420.001
90° right angled probe with linear arrangement of contact pins for measurement of inclined and normal cracks (e.g. inside bore holes or inside of tubes). Includes external magnet as 2nd current pole cable and 1 set of spare contact pins (standard pins).
Standard Probe RMSL 0°
#4416.001
Linear arrangement of contact pins for measurement of normal cracks. The design of the probe allows for measurements of difficult to reach locations. Includes 1 set of spare contact pins (standard pins).
Special Probe RMSL 90°
#4498.004
90° right-angled probe with linear arrangement of contact pins for measurement of normal cracks. With a special arrangement of the pins it is possible to measure cracks with a width more than 2.54 mm (0.1 inch).
Special Probe RMSQ 90°
#4498.007
90° right angled probe with square arrangement of the pins to measure particularly small narrow cracks in very narrow gaps.
Special Probe RMSQ 0°
#4498.010
Square arrangement of the pins to measure normal cracks at very difficult to reach locations (e.g. inside deep bore holes or grooves).
| Application | Depth measurement of surface cracks in electrically conducting materials |
| Principle of Measurement | AC electrical potential drop method |
| Dimensions | 83 mm x 151 mm x 35 mm / 3.3 inch x 5.9 inch x 1.4 inch |
| Weight | 225 g / 8 oz |
| Power Supply | 2 x 1.5 V Alkali-Manganese dry cells, size AA (mignon), alternatively 2 x 1.2 V NiCd or NiMH rechargeable batteries, size AA. Optical alarm in case of empty batteries. |
| Operating Time | At least 11.5 hrs with Alkali-Manganese cells. |
| Data Storage | A total number of approx. 3850 values can be stored in up to 300 batches. For each batch, a statistical evaluation can be printed out. This evaluation determines the minimum value, the maximum value, the average value and the standard deviation. |
| Measuring Range | 0 mm to 99.9 mm / 0 inch to 3.9 inch for ferrous material, 0 mm to 12 mm / 0 inch to 0.5 inch for aluminum, copper, brass. |
| Measurement Accuracy | Depending on material and measuring range. Typical figure for two-point material correction: Ferromagnetic material 3 to 15 %, austenitic material 3 to 25 %. |
| Serial Interface | RS232C to KARL DEUTSCH printer or PC: 4800 bauds, 8 data bits, 1 stop bit, no parity bit. USB-adapter available. |
| Environmental Conditions | Operating temperature: From 0° C to 45° C, storage temperature: -20° C to 60° C with removed batteries, From 0° C to 45° C with inserted batteries (depending on battery type and brand). |
Minimum Purchasing Requirements: Instrument, Calibration Block, Probe (select from above list). We recommend the following: