WERT-60/120 2D Electrical Resitivity Tomography System
The resistivity/IP mainframe of WERT-60/120 2D Resistivity Tomography system designed the receiver and the transmitter in one unit, which support 1D Resistivity, 1D Induced Polarization VES survey and 2D electrical tomography survey;it features multiple functions, high accuracy, fast speed, high reliability and excellent expandability. The mainframe working with multi-electrode switcher as WERT-60/120 system, can support 2D resistivity imaging survey also with max 60/120pcs electrodes. The applications of ERT system include fault investigation, ground water table investigation, soil moisture content determination and many others.
| • 2D multi-electrode Resistivity tomography |
| • VES - vertical electrical sounding ( resistivity and IP) |
| • RP - resistivity and IP profiling |
| • SP - self potential |
| • Metal and nonmetal mineral resources detection |
| • City geophysical exploration, railway and bridge inspection |
| • Hydrology and engineering geology as seeking for ground water, inspecting dam base and flood protection levee for incipient faults |
| • Geothermal prospecting |
| • Landslides and other geological disaster exploration |
| • Wenner Alpha | • Wenner Beta | • Wenner Gamma |
| • Dipole-dipole | • Schlumberger | • 3P-direct |
| • 3P-reverse | • 2P AM | • 3P A-MN |
| • 3P AB-M | • MN-B | • SP-M |
| • SP-MN | • Combined profiling | ...... |
| • Transmitting unit and receiving unit are of all-in-one design, portable and lightweight. |
| • Super high-power, high anti-interference performance and precision: up to 6600w (1100v×6A) power, 48Vp-p voltage range ensures to get a good result in a area with high resistance. |
| • Automatically achieving compensation of self-potential, drift and electrode polarization, up to ±10V. |
| • Receiving unit support transient over-voltage protection, transmitting unit supports over-voltage protection, over-current protection and AB open-circuit protection. |
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• For general resistivity and IP survey function, 9 types of electrode arrays are available. Electrode distance (namely “Program”) can be inputted or called. Geometric factor K can also be generated automatically or calculated manually. For multi-electrode 2D resistivity imaging, up to 18 electrode arrays are available. It could scanning measure according to fixed section (including AMNB, ABMN, AMBN, AMN, MNB, A-MN-B, Sp M, Sp MN, charge M, charge MN) or continuous rolling scanning measure according to variable section (including A-M, A-MN, AB-M, AB-MN, MN-B, A-MN rectangle). |
| • Program: the program can memorize 100 groups of electrode distances, avoiding repetitive input. Or you just input a program Id and step to call the corresponding electrode distances. |
| • Earth resistance inspection: ground condition can be inspected at any time. |
| • Mass data storage: Up to 1GB capacity (extended) enable store 5,000,000 groups measuring data (including current, voltage, SP, Ro, Ms, metal factor, TH, R, J). |
| • All parameter and data are under power-failure protection; and thus data will not be lost even thought the system shuts down accidentally. |
| • USB port enables it to transfer data to computer. |
| Configuraitons | Main products | Main features |
| WERT-60 |
Earth resistivity/IP meter - 1 set Switching box - 1 set Resistivity cable, 30 take-outs - 2 pcs 。。。 |
• Centralized system • Max support 60 take-outs |
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| WERT-120 |
Resistivity/IP meter - 1 set Switching box - 1 set Res cable, 30 take-outs - 4 pcs Extension cable - 2 pcs 。。。 |
• Centralized system • Max support 120 take-outs |
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| WERT-4B |
Resistivity/IP meter - 1 set Intelligent Res cable, 10 take-outs 。。。 |
• Distributed system • No limit on electrode qty • Easy in operation |
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| Resistivity/IP Meter | |
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Receiving |
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| Voltage precision | If Vp≥10mV, ± 5‰ ± 1LSB; if Vp< 10mV, ±1% ± 1LSB. |
| Input impedance | ≥50MΩ |
| Apparent polarizability precision | ±1% ± 1LSB |
| SP compensation range | ±10V |
| Current channel | 5 A, ±0.4% ± 1LSB, 24 bit A/D |
| Current precision | If Ip≥ 10mA, ± 5‰ ± 1 LSB; if Ip< 10 mA, ±1% ± 1 LSB. |
| Suppression | ≥80dB for 50Hz industrial frequency (common mode interference or differential mode interference) |
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Transmitting |
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Max transmitting power: |
4500W (for general Res/IP sounding); 1125W (for WERT-60/120, limited by switcher box); 2400W (for WERT-4B, limited by intelligent Res cable). |
| Max voltage |
±900V(for general Res/IP sounding); ± 450V (for WERT-60/120, limited by switcher box); ± 800V (for WERT-4B, limited by intelligent Res cable). |
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Max current
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± 5A (for general Res/IP sounding); ± 2.5A (for WERT-60/120, limited by switcher box); ± 3A (for WERT-4B, limited by intelligent Res cable). |
| Pulse width | 1~60s, duty ratio 1:1 |
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Others |
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| Display | Large LCD screen, 160 * 128 pixels |
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Over-current
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≤55mA |
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Working temperature
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-10℃~+50℃, 95 %RH |
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Storage temperature
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-20℃~+60℃ |
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Instrument power
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Eight size-D dry cells |
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Weight
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≤ 7 Kg |
| Dimension (L×W×H) | 310mm * 210mm * 210mm |
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Multi-electrode Switcher |
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Max electrode connected
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60 and 120 (for option) |
| Insulation impedance | ≥500MΩ |
| Max working voltage | 500VDC |
| Max working current | 2.5ADC |
| Power supply | Internal 7.4V 4AH rechargeable lithium battery, for continuously 25 hours |
| Working temperature | -10°C~+50°C |
| Weight |
5.8Kg (for WERT-60) 9.2Kg (for WERT-120) |
| Dimension |
340mm * 295mm * 152mm (for WERT-60) 470mm * 357mm * 176mm (for WERT-120) |
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Res cable |
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| Electrode qty | 30 pcs |
| Electrode space | 5m/10m |
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Intelligent Res cable |
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| Electrode qty | 10 pcs |
| Electrode space | 5m/10m |
| Max working voltage | 800V |
| Max working current | 3A |
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| Multi-electrode cable | Electrode |
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| 2D data inversion | Application with wenner array from Albania | Gold exploration from Madagascar |
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