The DUALEM-4 has 4-m separation between its transmitter and dual receivers, so its dual depths of conductivity measurement are 2 m and 6.4 m (by the 70-% cumulative-sensitivity guideline). In-phase measurements sound magnetic susceptibility and detect metal.
4-m DUALEM sensors can be carried by one person with sufficient strength; padding between the sensor and carrier can improve comfort. Alternatively, the harness can be split for 2 people to carry the sensor.
The DUALEM-4S sensor is available separately at lower price for integration with the user’s own surveying systems. Towing on a sled optimizes spatial and geophysical resolution, but a low cart is a typical platform for surveying.
| Feature | Description |
|---|---|
| EM Arrays | 4-m horizontal co-planar (HCP) and perpendicular (PRP) transmitter-receiver arrays, operating at 9 kHz |
| Measured EM Quantities | HCP apparent conductivity and in-phase PRP apparent conductivity and in-phase |
| Measuring Ranges | Conductivity: -1000 to +1000 mS/m, 0.1 mS/m resolution In-phase: -300 to +300 ppt, 0.01 ppt resolution |
| Data Rates | 1 Hz standard, optional rates include 0.1-, 5- and 10-Hz |
| Integrated Components | Digital signal processor, GPS receiver, indicator LEDs, RS-232 port, thermometers, Wi-Fi transceiver |
| Power | 8- to 16-V DC from harness module or external battery, draw about 3 W |
| Operating Dimensions | 0.089-m diameter, 4.41-m length (3.5” by 173”) |
| Weights | 15 kg operating, 34 kg shipping |
| Shipping Dimensions | 2.55m by 0.30m by 0.15m |
| Ancillary Items | Data/power cable, software and documentation, hinged metal case. DUALEM-4 has a Bluetooth transceiver, controller and harness |
