GEORES  GEOPHYSICAL RESISTIVITY INSTRUMENT

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What is GEORES?

GEORES is a geophysical resistivity instrument with its 4 spikes having direct contact with the soil. It is used for locating underground anomalies of caves, tunnels, graves, ancient walls, water and big metals.

How to use GEORES?

Drive 4 spikes into the ground allowing an “a” distance between each electrode. Connect the wires into the instrument's 4 terminals. Press TEST button (on). The green current output indicator lamp is lit. Electrical current is transmitted between electrodes. Press TEST button (off) and read the resistance value on display.

When high conductivity (big metal, groundwater, etc.) is located, there appears a sudden decrease of the value on display. When low conductivity (or non conductivity) (cave, tunnel, void, ancient wall, etc.) is located, there appears a sudden increase of the value on screen. Regarding positive and negative zones, please refer to the user manual.

By testing on a straight line in horizontal and vertical directions, the user can pinpoint target location and depth. C1, C2, P1, P2 are 4 spikes. By driving current through C1 & C2, the instrument measures potential difference between P1 & P2. In Wenner Array the distance ‘a’ must be kept constant.

The Detection Depth:

"a" is the distance between two adjacent spikes and approximately the detection depth. As "a" increases, detection depth increases.
 

 

How to Pinpoint A Target?

              

STEP 1                                                    STEP 2

 

The target (cave, void, tunnel, ancient wall) is located at the intersection point of two testings (horizontal test 3 & vertical test 9) where the resistivity values on display have suddenly increased.

 

 

 

Specifications / Features:

Power supply: 8 x 1.5V AA batteries (not included)

Testing Current: 5mA（0.00～19.99）Ω; 0.5mA（20.0～199.9）Ω; 0.05mA（200～1999) Ω              

Main unit with 4 terminals (C1, P1, P2, C2)  (orange)                                                                  

Test leads (red, black) (each 1.5 metres)                                                                  

4 metal spikes (electrodes)

Test wires (20 metres [black] & 40 metres [red])

Aluminum carry case (dust-damp proof)

Weight (whole unit): about 4 kgs

Weight (main unit): about 0.8 kg                                                                                   

Dimensions (whole unit): 50 cm x 40 cm x 18 cm                                                             

Dimensions (main unit): 26 cm x 13.5 cm x 7 cm                                                                

Function switch, potential terminals (P1 & P2), current terminals (C1 & C2), TEST (on-off) button, LCD, low battery sign, current output indicator (green led), open circuit alarm (when there is connection failure, no loop).

 

 

 

Copyright 2008, Ozdemirli Co, Ltd., Address: Uzgorenler Sok. No.14 Pasaj-7 Demirlibahce Ankara Turkey

Tel: 90.312.3625564   Fax: 90.312.3628894    ozdemirliltd@hotmail.com