TL-JW61 Concrete Resistivity Tester

Semi-battery method No need to destroy the steel bar on the surface of reinforced concrete for orientation corrosion. By using this method, contour map drawing program can effectively locate the area of rust activity. When connecting bars and cables, part of the concrete surface needs to be destroyed. However, the use of R62 concrete resistivity tester Wenner Probe contact concrete protection layer, It can easily measure the corrosion status of concrete protective layer. The resistivity of concrete plays an important role in detecting rust. When the resistivity of concrete is low, the possibility of its rust activity is much higher than that of high resistivity. The resistivity is calculated by formula R=V/I and Rho =2 PI alpha R, in which R is a resistance, V is the measured voltage through the electrode, I is the current flowing through the electrode, the coefficient of resistance is the resistance coefficient, and the alpha is the distance between the electrodes.

JW61 includes a row of four electrodes. By measuring the outside two electrodes through the current, the voltage generated on the two internal electrodes can be measured. R62 can evaluate the corrosion of the concrete and display the resistivity (K Omega /cm) on the host.  

Composition Of Instruments

The instrument consists of main engine, probe, signal wire, USB transmission line, data bag, battery, aluminum alloy box, etc. (as shown in Figure 1-2).

                                             

Performance Of Instruments

1. The measurement range is:0~300 kΩcm;0~3000 kΩcm;
2.The measurement accuracy is:±1 kΩcm;
3.Resolution:0.1kΩcm;
4.liquid crystal display:160*128;
5.The built-in lithium battery;

Attention

1.JW61 is easily influenced by ambient temperature and water content of concrete.
2.Because the current will be affected by the reinforcement in the concrete, so the probe should be far away from the reinforcement.
3.When the width of the concrete surface is narrower than the width of the probe, or if all the four electrodes fail to touch too rough concrete surface, the measurement cannot be carried out.
4.Without permission, do not open the instrument case, otherwise the consequences will be conceited.

The key description of the instrument is Table 2.1

Opening

Press the instrument pane l Key,The instrument works on electricity and starts working. The starting interface is shown in Figure 2-1.

 Functional Selection Interface

Press any key at the start interface(←The button can turn on the backlight at this time),Enter the function selection interface, as shown in Figure 2-2.

The function selection interface has the functions of electrical resistivity testing, data viewing, data deletion, data transmission and date setting. Adopt ↑、↑ Key, Select the corresponding function. Press OK The key enters the corresponding functional interface.

Resistivity Test  

The resistivity test interface is shown in Figure 2-3. The interface of resistivity test is divided into two parts: information area and test area.

In the information area, users can set numbers. The instrument can automatically switch between low and high ranges according to the resistivity. When the test type is selected for a low range, the icon is shown in Figure 2-4, and the icon is shown in Figure 2-5 when the test range is high.

The resistivity testing process is shown in Figure 2-6.

Setting Number

Setting the engineering number of the resistivity test.

Project number: number for each project.

Operation:  press←、→ Key move the cursor position, press ↑、↓ The key can adjust the numeric value of the cursor position.PressOKKey confirm setting and testing,pressEsc The key returns to the upper interface,If the test area does not changeThe OKkey is the subsequent measurement of the data in the original component.

Preparation Of Test

Put the sponge into the sensor probe,The purpose of the sponge into the sensor probe.In order to get the accurate result, sponge of sensor should be kept clean. Baths (water containers) should be cleaned before and after testing. The sponge is immersed in water, and then it is stuffed into four holes of the container. After use, remove the sponge and wash it with tap water. The sponge should be cleaned regularly with a bathtub (water container).

Connect The Sensor To Instrument

To connect the sensor and instrument through the cable,it is suggested that the instrument should not be opened before the connection, and then the instrument is reopened after the connection, otherwise the instrument may be damaged.

The Concrete Surface

If the concrete surface is too dry or too wet, it may cause great error. When the surface of concrete is dirty, it cannot be measured, which may lead to great errors. Therefore, as far as possible, keep the surface condition of the concrete well. If the surface of the concrete is coated with paint, it will not be able to measure the electrical resistivity. Similarly, if the concrete surface is coated with waterborne coatings, the measurement will not be correct. Under these circumstances, we should drill holes in 2~3mm on the concrete surface and measure them in the concrete so as to get the best results.

The Host

JW61 consumes electricity very much, so it is better to charge the instrument before measuring.

Before the field measurement, turn on the instrument and check whether the instrument is working normally. Use a reference block to check whether the results are normal.

Because there is no predefined minimum clearance for concrete surface measurement, the measurement at the same point is of little significance. If the measuring gap is too large, it is possible to neither detect the current corrosion activity nor generate the wrong data accumulation. Therefore, the measurement gap should be consistent with the measured concrete and the final measured results. In general, the field measurement gap is 50cm. If the possibility of corrosion is high, we recommend smaller clearances. When measuring in a specific place, it is best to keep the sensor as far away from the reinforcement as possible.

Resistivity Test

After the completion of the test, you can start the test. First, we introduce the current parameter area of the test area, which is as follows:

It has storage: stored data number;
The purpose of maximum: maximum value in acquisition data;
An average value of average value in acquisition data;
Purpose: resistivity resistivity values;

In The Testing Process Are As Follows

1.PressOK The key enters the test interface.
2.When the sensor is placed on the measuring area, the measured resistivity value is displayed on the LCD screen, and the resistivity value is stable pressingSave Key,That is to complete the test.
3. during the measurement process, the switch key changes the high and low range. After changing, it displays the current resistivity value on the LCD screen.
4.After the measurement is completed, the next measurement area is continuously measured.PressEsc Key,You can reset the parameters.

Dataview

The data view interface (as shown in Figure 2-10), the left side is the layout area, and the right side is the data area.Press↑、↓Keys can choose different numbering values, and the right data area displays the date and resistivity value of the currently selected numbers.Press the Esc  key to return the function selection interface.

Data Transmission

The USB transmission interface is shown in Figure 2-8.Press OK key is transmitted,PressEsc Key return function selection interface. During transmission, prompt transmission. As shown in Figure 2-9, after the end of the transmission, the prompt ends the transmission, as shown in Figure 2-10, and then press any key to return to the function to select the interface.

Data Deleting

The data deleting interface is shown in Figure 2-11.Press OK Key delete all data, and delete after data deletion.Press Esc key The data is not deleted to return to the functional selection interface.

Note: all data can't be recovered after being deleted. Please use this function with caution.

Date Setting

The date setting interface is like figure 2-12.

Press←、→The key moves the cursor position,Press ↑、↓ The key modifies the value,Revise and pressEsc The key does not save the settings to return,Press Save Key save settings return.

Power-off

PressKey can be shut down.

Appendix: reference standard for resistivity

Schedule