The EM61 Mk. 2, an enhanced version of the patented EM-61, is a time domain metal detector which detects both ferrous and non-ferrous objects with excellent spatial resolution. Target response is a single, sharply defined peak, facilitating quick and accurate location. A single 200 litre (55 gal.) drum can be detected at depths greater than 3 metres. Modification for increased power, to increase both the sensitivity to smaller targets and depth of exploration is available.

Data from multiple time gates - three or four, user selectable - are recorded to provide a more complete measurement of the response decay rate for improved target characterisation (and discrimination). Early time gates improve the detection of smaller, as well as deeper targets; a mid-range time gate, at the same position as the original EM-61, offers comparison with, and continuation of original EM-61 data sets.

Data acquisition is supported by the PRO4000 field computer. Important features include real-time graphic display of data for review and quality control; high capacity data storage (min. 330,000 data sets) for extended survey time; increased rate of data collection; and additional input connections for simultaneous collection of EM and GPS data.

The system is immediately GPS compatible; a fully integrated Trimble AG114 - with no requirement for a separate GPS receiver console - is available as an option.

The system can be pulled as a trailer, in single or multiple unit configurations, or carried by an operator with a belt harness.

For applications in marine environments, the EM-61 (Submersible) is capable of data collection to depths of 60 metres below the surface of water.

1: Main: Air-cored coil, 1 x 0.5 m in size, coincident with EM source
2: Focusing: Air-cored coil, 1 x 0.5 m in size, 30 cm above main coil