Geonics LTD EM31-MK2

Why does my Geonics EM31 only shows negative conductivity values?

Geonics EM31 troubleshooting almost always starts with checking the batteries. Turn on the EM31 and set the knob to BATT to read the voltage. If the needle reads between the battery marks of an analog display or between +/- 4.4V on a digital display, then the batteries should not be an issue. Note, the plus and minus values should be …

Geonics LTD EM61-MK2A

EM61 detection of ferrous and nonferrous metals

Will the EM61 detect both ferrous and nonferrous metals? Yes! The EM61 does, in fact, respond to both ferrous and non-ferrous metals! Let’s first quickly review how the EM61 detection occurs. The EM61’s transmitter coil carries a current that creates a strong primary magnetic field that has the potential to intercept a metal target. Once the transmitter current is stopped, the …