DUALEM Products

DUALEM instruments measure the conductivity and magnetic susceptibility of the ground, and detect buried metal.  The patented DUALEM dual-geometry array simultaneously measures conductivity and susceptibility to two distinct and easily quantified depths.
 
DUALEM instruments are calibrated precisely and permanently at the factory using a patented technique, eliminating problematic ad hoc calibrations in the field.  Precise calibration, base-level stability, high sensitivity and advanced digital signal processing give the instruments unmatched accuracy.
 
DUALEM instruments provide output to their RS-232B port in either NMEA0183-standard or DUALEM format.  As NMEA0183 is the standard for GPS communication, a wide variety of GPS loggers and software can record DUALEM measurements and integrate them with GPS positions.
 
DUALEM instruments operate by electromagnetic induction, so no contact with the ground is needed, which enables surveying at moderate speed over uneven or electrically resistive terrain.  Terrain that has been surveyed using DUALEM instruments includes forests, recent volcanic flows, and multi-year ice.
 
The DUALEM-2 and DUALEM-4 are complete instruments, and the DUALEM-2/4 can be configured as either a DUALEM-2 or a DUALEM-4.  The instruments incorporate monitors for applied voltage, temperature and configuration.
 
The DUALEM-1S, DUALEM-2S, DUALEM-21S, DUALEM-42S and DUALEM-421S are sensors intended for use with external power and logging systems.  Lights on the sensors indicate the status of power and serial communication, and the sensors record values for pitch and roll from internal monitors.  In common with all DUALEM instruments, the DUALEM sensors provide internal storage for time, grid position, voltage, temperature, and measured electromagnetic responses.
 
Please direct inquiries to Dualem Inc., phone 1 905 876 0201, fax 1 905 876 2753, or e-mail address listed on www.dualem.com.


DUALEM-2

The DUALEM-2 has 2-m separation between its transmitter and dual receivers, so its dual depths of conductivity measurement are 1 m and 3 m (by the 70-% cumulative-sensitivity standard).  For metal detection, the DUALEM-2 can detect a steel drum to 2-m depth.  
The double shoulder-harness, smooth tubular design and moderate weight make the DUALEM-2 practical for prolonged surveys by a single operator.  The DUALEM-2 is also convenient to pull on a sled at the ground surface to maximize sensitivity and spatial resolution.



DUALEM-2/4

The DUALEM-2/4 can be configured with either 2-m or 4-m separation between its transmitter and dual receivers.  Depending on configuration, the specifications of the DUALEM-2/4 are the same as either the DUALEM-2 or the DUALEM-4.  The shipping weight of the DUALEM-2/4 is 34 kg, and the shipping dimensions are 155 by 53 by 15 cm.


DUALEM-4

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 m (by the 70-% cumulative-sensitivity standard).  For metal detection, the DUALEM-4 can detect a steel drum to depths greater than 3 m.
 
The double shoulder-harness and smooth tubular design make the DUALEM-4 practical for surveys by a single operator.  Some users pull the DUALEM-4 on a cart behind a motor vehicle.



DUALEM-1S

The DUALEM-1S dual-geometry sensor has 1-m separation between its transmitter and dual receivers, so its dual depths of conductivity measurement are 0.5 m and 1.5 m (by the 70-% cumulative-sensitivity standard).  For metal detection, the DUALEM-1S can detect a steel drum at depths beyond 1 m.  
Users control the DUALEM-1S through its RS-232 port and supply power through the same connector.  Users typically integrate the NMEA-format measurements with GPS positions on a logger.
 
The compact size of the DUALEM-1S makes it ideal for towing on a sled for optimum spatial and geophysical resolution, and for integrating with other sensors.



DUALEM-2S

The DUALEM-2S dual-geometry sensor has 2-m separation between its transmitter and dual receivers, so its dual depths of conductivity measurement are 1 m and 3 m (by the 70-% cumulative-sensitivity standard).  For metal detection, the DUALEM-2 can detect a steel drum to 2-m depth.  
Users control the DUALEM-2S through its RS-232 port and supply power through the same connector.  Users typically integrate the NMEA-format measurements with GPS positions on a logger.
 
The range of sensitivity of the DUALEM-2S makes it suitable for towing on a sled or low cart and effective for a variety of applications.  For some applications, users integrate the DUALEM-2S with other sensors, such as a magnetometer.



DUALEM-21S

The DUALEM-21S sensor has dual-geometry receivers at separations of 1- and 2-m from the transmitter, which provide four simultaneous depths of conductivity sounding, four simultaneous depths of susceptibility sounding, and detection of metal.
 
Users control the DUALEM-21S sensor through its RS-232 port and supply power through the same connector.  Users typically integrate the NMEA-format measurements with GPS positions on a logger.
 
The several sounding-depths of the DUALEM-21S enable the analysis of layering in the top few metres of the earth.  The DUALEM-21S is suitable for towing on a sled or cart.


DUALEM-42S

The DUALEM-42S sensor has dual-geometry receivers at separations of 2- and 4-m from the transmitter, which provide four simultaneous depths of conductivity sounding, four simultaneous depths of susceptibility sounding, and detection of metal.
 
Users control the DUALEM-42S sensor through its RS-232 port and supply power through the same connector.  Users typically integrate the NMEA-format measurements with GPS positions on a logger.
 
The several sounding-depths of the DUALEM-42S enable the analysis of layering in the top several metres of the earth.  The DUALEM-42S is suitable for towing on a sled or cart, or for carrying at hip height.


DUALEM-421S

The DUALEM-421S sensor has dual-geometry receivers at separations of 1-, 2- and 4-m from the transmitter, which provide six simultaneous depths of conductivity sounding, six simultaneous depths of susceptibility sounding, and detection of metal.
 
Users control the DUALEM-421S sensor through its RS-232 port and supply power through the same connector.  Users typically integrate the NMEA-format measurements with GPS positions on a logger.
 
The variety of sounding depths makes the DUALEM-421S ideal for the analysis of the thickness, conductivity and susceptibility of layering in the top several metres of the earth.    Towing on a sled optimizes spatial and geophysical resolution, but a low cart is also a suitable platform for surveying.