China 10*10 Array Wire Beam Electrode Potential Current Mapper

CST520 Potential & current mapper uses a 10x10 array wire beam electrode (WBE) to simulate the surface of metal, cyclically scanning voltage/current of WBE surface to obtain the distribution of potential and current of the metal under coating or biological membrane, so as to characterize the localized corrosion behavior of metal materials.
With built-in voltage follower and zero resistance ammeter(ZRA), it can accurately measure the open circuit potential and galvanic current (vs.RE) of any single electrode, without external polarization to destroy the microcorrosion environment. It is particularly suitable for spontaneouscorrosion behavior study of metals. CST520 integrates double-channel high precision data converter, with highest sampling resolution 24 bit, and highest sampling rate 1000Hz. The front-end uses chopper stabilizing zero amplifier, working with second-order lowpass filter to eliminate the power-line interference effectively.
By automatically adjusting measurement range, CST520 can determine the signal magnification according to the current and potentialvalue. Watchdog is used in the system to improve the reliability of software operation. The instrument can connects to the PC by USB cable, and WBEScan software can achieve real-time display of row/column position of the WBE, and the corresponding current/potential value.
Working principle
Wire Beam Electrode is an array electrode where the metal wires (insulated between each other)are positioned in order. It can be used to simulate and measure the localized potential/current distribution of the electrode surface. The structure of WBE is shown in pic 1. CST520 WBE scanner applies the theory of voltage follower and ZRA to measure the OCP(vs. RE) of each metal wire and the short-circuit current among each wire. Please see the schematic diagram pic.2. It achieves auto cyclic measurements of potential/current of 100-way electrode by 100 groups of low power consumption relays.

10x10 array wire beam electrode (WBE)

Circuit of zero resistance current measurement and surface current scan

Applications
CST520 can be used for measuring the surface potential and current in the inducing, developing and inhibitory process of metal localized corrosion, and can be used to study crevice corrosion, under-deposit corrosion, and the non-uniform metal corrosion behavior under the biological membrane, coating, and anti-rust oil film.
Specifications
Data acquisition: AD 24-bit
Data acquisition rate: 1~1000Hz
Input impedance: 1x1012Ω
Max.measured potential range: ±5V
Current measurement range: ±20mA
Current range: 20mA~20nA, 6 ranges
Potential resolution: 10μV
Minimum current sensitivity: 10pA
Communicaton protocol: RS232
Baud rate: 115200bps
Power supply: AC 220V
Instrument dimensions: 36x30x14cm Weight: 6kg
environment: Temperature -10ºC~50 ºC, relative humidity< 80%, stay away from strong corrosive gas.
Software
CST520 potential &current mapper with wire beam electrode is controlled by WBEScan software. Measured potential and current value is displayed directly on the computer screen, and the data can be imported to Origin to show the potential & current distribution of the WBE surface with 3D graphs. (See the pic.4.) It can be concluded from the pic.4 that there are three regions where the potential is relatively negative, and in the current graph on the right, there are negative current at the same region, which means severer corrosion occurs in these three regions of the WBE surface.

Potential distributor on WBE surface

Current distributor on WBE surface

Shipment list:
1. CST520 instrument host x1
2. 10x10 array wire beam electrode x1
3. WBE Scan software x1
4. Electrode cable x1
5. USB cable x1
6. Power cable x1