WGMD-9 centralized electrical method system

WGMD-9 centralized super high-density electrical method system

WGMD-9 centralized super high-density electrical method system is a new generation of high-density electrical method system developed by integrating advanced electronic technologies such as handheld computers, Bluetooth, 24-bit A/D, and high-power control. The size and weight of the instrument are significantly reduced. . This system uses the WDA-1 super digital DC electric meter as the measurement and control host. It can realize centralized two-dimensional high-density resistivity measurement by optionally equipping the WDZJ-60 multi-channel electrode converter, centralized high-density cables, and electrodes.

Working principle

Resistivity sounding method does not take into account horizontal changes in the subsurface resistivity. While 2d electrical imaging method with the resistivity changes in vertical as well as horizontal directions along the survey line.

Typical 1D resistivity sounding surveys usually involve about 10 to 20 readings, which 2-D imaging survey can finish thousand of points with different configuration. So the working efficiency improved greatly.

Applications

● Energy resource exploration

● City geophysical exploration

● Railway and bridge prospecting

● Metal and non-metal mineral resources prospecting

● City geophysical exploration

● Hydrology and engineering geology to inspect base of dam and flood protection levee for incipient faults

● Geothermal survey

● Landslides and other geological disaster exploration

PS：System can conducts:

● Self-potential survey

● General resistivity/IP VES survey

● Multi-electrode 2D resistivity imaging

● Multi-electrode 2D induced polarization (IP) imaging

● Multi-electrode 3D resistivity imaging

● Typical 1-D resistivity sounding surveys usually involve about 10 to 20 readings, while 2-D imaging surveys involve about 100 to 1000 measurements. In comparison, a 3-D survey might involve several thousand measurements.

Arrays

Features

● Portability and flexibility

● Unique and open measuring process control

● Two cable sockets for cross-hole survey

● Multiple functions with more meauring parameters

● High power supply, wide current range, high accuracy

● 16 kinds of electrode arrays of 2D Imaging survey

● Extendable system, flexible configuration

● Excellent anti-interface performance

● Diagnosis program can find the fault quickly

Detailed description

（一）Features Explanation

● Lightweight and portable

The host integrates the transmitting unit and the receiving unit in one body, with small size and light weight.

● Flexible measurement process control

User-defined power-on time and power-off time controls measuring process. The main frame can also monitor variation ofelectrode potential automatically. If the parameter exceeds the user-defined over-variation limit, it stops measuring, and wait to measure again until it becomes stable.

● Tablet computer control, powerful functions

Windows 10 tablet computer realizes human-machine interface and acquisition control, acquisition parameter setting, data display and storage, various curve drawing (such as joint profile, joint electrical sounding, Wenner sounding, Schlumberger sounding, and induced polarization attenuation curve, etc.), and can display measurement chromatograms in real time. It is fast and intuitive, and the operation is very simple, which greatly improves the quality and efficiency of field work.

● Dual cable socket design

The host is designed with two cable sockets which enable cross-hole electrode array configuration works without switching control unit, and thus makes themeasuring process much simpler and easier.

● One machine with multiple functions and wide adaptability

The host voltage and current range and small signal accuracy are greatly improved. This design makes it suitable to work with rock sampling tester,high-power IP receiver, general electrical method instrument, IP instrument, water finder, 2D and 3D multi-electrode electrical method instrument, etc.

● Capable of measuring various types of data

It is able to acquire data of voltage (VP), current (IP), apparent resistivity (R0), Self-Potential (SP), apparent polarizability (M~M7), metal factor (G1~G7), half decay time (TH), deviation (r), induce polarization ratio (J), etc.

● Powerful anti-interference technology The multi-stage filtering and signal enhancement technology and the integrated electrical interference suppressor function (with super strong anti-common mode interference and differential mode interference capabilities) make the measurement accuracy high.

（二）Support flexible configuration combination

Item	Parameters
Data Collection System	Centralized 2D high-density resistivity measurement system
Mainframe	WDA-1 super digital DC electric meter
Multi-channel converter	WDZJ-60 or WDZJ-120 multi-channel electrode converter
Resistivity / IP Cable	Centralized high-density cable
Battery	PDX-100LIII (100V,3Ah,lithium battery) PDX-200LIII (200V,3Ah,lithium battery) PDX-200LV (200V,5Ah,lithium battery) PDX-480 LⅡ (60V～480V, 2.2AH,lithium battery) PDX-1(144V,1.3Ah,Lead-acid batteries)
Electrode	Copper electrode Non-polarized electrode

（三）Different parameter collection, different wiring methods

● 2D Resistivity Imaging

● 2D Resistivity/Induced Polarization(IP) Imaging

● 3D Resistivity Imaging

Specifications

（一）WDA-1 super digital DC electric meter

Receiving section

Item	Parameters
Voltage	±32V (24 bit A/D). If Vp≥5mV, accuracy is ±0.2% ±1LSB If 0.1mV≤Vp<5mV, accuracy is ±1% ±1LSB
Apparent polarizability measurement accuracy	±0.2%±1LSB
Input impedance	＞50MΩ
SP compensation range	±10V
Maximum supply current	6A (24bit A/D with WDZJ-3, no more than 2.5A) If Ip≥5mA, accuracy is ±0.2% ±1LSB If 0.1mA≤Ip<5mA, accuracy is ±1% ±1LSB
Suppression	For 50Hz industrial frequency interference (common mode and differential mode interference), suppression is more than 80dB.

Transmitter

Item	Parameters
Max transmitting power	9000W
Maximum supply voltage	1500V (with WDZJ-3, no more than 450V)
Max current	6A
Transmitting power pulse width	1~60s, duty cycle is 1:1

Other parameters

Item	Parameters
Power supply	Internal 7.4V 4Ah rechargeable battery continuously lasts for 20 hours (or 12V external power supply).
Ports support (transmitting unit)	A, B, M and N connecting ports, DC high voltage input ports and external battery terminals, 2 cable ports, RS-232, Bluetooth.
Working temperature	-10℃~+50℃, 95%RH
Storage temperature	-20℃~+60℃
Weight	≤4kg
Dimension	270mmx246mmx123mm
Internal power source	Maximum voltage 96V (two notches, 48V and 96V); Maximum current is 0.7A.
Tablet computer configuration	Windows 10 64-bit operating system, 2048×1536 retina screen, system memory no less than 2GB, storage capacity no less than 64GB, Bluetooth, USB port.

（二）WDZJ-60 multi-channel electrode converter (optional, multiple converters can be used in series to expand the number of system electrodes)

Item	Parameters
Number of conversion electrodes	60/unit
Insulation performance	>500MΩ
Maximum operating voltage	500VDC
Maximum operating current	2.5ADC
Power supply	Built-in lithium battery, continuous operation for more than 25 hours
Operating temperature	-10℃~+50℃

（三）Centralized high-density resistivity cable (optional)

Item	Parameters
Cable	32 cores, outer diameter Φ6mm
Maximum working voltage	500V
Maximum working current	3A
Quantity for each converter	2 (30 electrode taps/tap), special requirements are specified by the user when ordering
Tap spacing	Specified by the user when ordering (usually 5m or 10m)
Cable insulation	Insulation between any two cores> 500MΩ1500V

（四）Copper electrode (optional)

Item	Parameters
Copper electrode	Φ10mmx280mm, with plug-in card
Quantity	Specified by the user when ordering

Case study