BRS-02 Borehole Multiple Array Resistivity Probe

The BRS-02 resistivity probe is contained in a 42-mm diameter non- magnetic and non- conductive housing, that is pressure rated to 3,000 meters of water depth.The probe is controlled by an on- board microprocessor that samples the electrical potential between the two electrode arrays at a rate of 2 samples per second.

The potential range of the measurement is +/-50V and has a resolution of 0.1mV. The digital data is then transmitted along a 4 conductor logging cable to the surface, to the data interface (BIN-04). The BRS-02 resistivity probe has the constant current generator build into the probe.

This probe has a true normal array configuration. The potentials are measured between the 16 and 48inch potential electrodes and the infinite electrode on the surface. The self-potential voltage in the borehole can be measured with the current generator "OFF".


Sensor Range 0 to 50,000 ohm-m
Sensitivity 1 ohm-m
Input Current 2,5,10,20 mA (selectable)
Options Temperature Sensor 0 to 50C range 0.001C sensitivity
Housing High strength filawound tube
Maximum Depth 3000 meters
Connection 4-pin (Gearhardt Owen)
Temperature Range Storage; -35 to +70°C
Operating: 0 to +70°C
Extended:  0 to +120°C
Sampling Rate 2 Hz
Output 20mA current loop, 4800 baud
Supply Voltage 48 VDC @ 5W (at probe header)
Dimensions 40mm diameter x 2.0 meters long
Weight 3.6 kg