China Cst700 Concrete Corrosion Monitoring Meter

CST700 concrete corrosion monitoring meter is completely controlled by computer. It's suitable for in-situ corrosion test of rebar in concrete of finished building, road, bridge etc.
The instrument is composed of high-quality CMOS and BiFET® integrated circuits. Low power consumption components are employed in key parts. Advanced power supply management system dramatically prolongs the working time of battery. The instrument uses LCD screen and user-friendly menu. Performance stability, structure compactness, and high degree of automation feature it. The built-in RS232 interface can be used to upload historical measurement data to the PC.
Working principle
CST700 concrete corrosion monitoring meter employs high-speed &low power consumption MCU and Guard Ring technique(see the pic. 1). Built-in compensation circuit can automatically determine the current compensation coefficient of the guard ring electrode according to the concrete resistivity and open circuit potential(OCP), which dramatically enhances the measuring accuracy of the rebar corrosion rate in concrete and avoids error resulting from over- or under-compensation. Built-in galvanostatic step compensation circuit can directly measure the concrete resistivity.
We apply double-potential feedback circuit design, which can confine the polarization current to CE projection plane.

Pic. 1 the guard ring electrode(GE)

We provide two testing cables, one connecting to the guard ring electrode sensor, the other connecting to the rebar by crocodile clamp. Please pay attention to good connection so as to avoid the measuring error resulted from big contact resistance.

pic.2.CST700 working principle
Specifications

Input impedance: 1x1011Ω Semi-cell potential measuring range: ±800mV Corrosion rate measuring range: 10-4~10.0mm/a Concrete resistivity:10~100kΩ•cmAbsolute measuring accuracy: ±5% Clock error: <1min/monthPotential resolution: 0.1mVCurrent resolution: 100pAPower supply: AC 220V/4 AA batteries Battery life: ~40hDimensions(cm): 29.5 x16.5x20, weight: 3.5KgEnvironment: temperature -10ºC~50ºC, relative humidity:<= 80%, no corrosive air

Applications
1. measure the corrosion rate of rebar in concrete and concrete resistivity. No need to bury testing probe;
2. be applied in corrosion monitoring of rebar in concrete of construction, dam, bridge, and in-situ evaluation of corrosion inhibitor.

Shipment list
CST700 instrument host *1
Software *1 kit
Guard ring electrode *1
Power cable *1
Measurement connection cable *2
USB cable *1