Control of mechanical joints / DRM-40 / Exothermic Probe

The exothermic probe DRM-4012 is used with the DRM-40 micro-ohmmeter to allow a non-destructive, fast and reliable testing of exothermic welds. The probe has been designed specifically for exothermic welds/electrical connections and it uses the four-points measuring method.

Measuring of a grounding connection

Grounding conductors are often interconnected using exothermic welds. Measuring the resistance of such a connection is the best way to evaluate precisely its quality when visual inspection is positive. Performing this resistance measurement with the DRM-40 and its DRM-4012 probe only takes seconds.
 

Exothermic probe DRM-4012

Compact and rugged, the DRM-4012 allows the user to test one handed, by simply applying the probe's contacts against the surface of the part to be tested. Then the DRM-40 detects the four contacts’ presence and displays the result. Each time a new measurement is required, the probe is taken off and then applied back to the part. It is also possible to maintain the probe in place and take several measurements of the same area by simply activating the "GO" key of the DRM.

Advantages

A particularity of the DRM-40 is its ability to perform very low resistance measuring using light current input. It makes possible the use of surface probes, like the DRM-4012. Also, this precision (0,01 µΩ) is particularly suitable for testing exothermic welds (CADWELD®) that have a resistance range of only a couple of micro ohms.

Oxidized pieces

The probe has four gold-plated contacts that have very sharp points. This helps to establish good electrical contact by piercing the oxide that is often present at the surface of the part. When the points are worn out, they are easily replaced.

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