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| Features |
No breaking out or drilling of concrete required, as it is a
surface test
Simple and accurate testing by sponge insert type sensor
A reference block ensures the reliability of test result
4 hours operation by rechargeable batteries
Low battery status display
Rugged aluminum case & carrying pouch
Easy to carry in a rugged aluminium bag
The corrosion of steel in concrete is an electro-chemical process which creates a current
flow causing metal to dissolve so that it is possible to assess the probability of
reinforcement corrosion by evaluating the electrical resistance of the concrete. The
factor is measured in terms of resistivity and expressed in Ohm.
The resistivity of concrete varies over a complete structure due to a variety of changing
site conditions from day to day so that other methods, like half-cell potential or impact
testing, should be combined to ensure the data. Generally, the probability of the steel
corrosion increases, the concrete resistivity deceases.
One of the practical problem of concrete resisitivity testing is to ensure the good
electrical contact between the electrodes and concrete surface. In Resitest-400M Concrete Resistivity Tester, Sponge
insert type sensor is used for good electrical contact. Resitest-400M is supplied with
Wenner sensor,carrying pouch, reference block, connection cable, AC adaptor, sensor
cleaning bottle, insert sponge, aluminium bag and instruction manual. |
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| Resitest-400M electrical circuit for measuring
concrete resistivity |
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| Photo |
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38mm (1.5") Spacing Measure |
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Click to Enlarge |
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| Measurement Examples |
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| Resitest-400M Kit |
Resitest-400M main body
Wenner sensor
Insert sponge (8 pcs)
Connection cable
Reference Block
Sensor cleaning Bottle
Carrying pouch
AC adaptor for rechargeable battery
Aluminium carrying bag
Instruction manual |
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| Option |
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WAS-1538 Wenner sensor |
PRS-120 Bulk Sensor |
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VDS-400 Variable Distance Sensor |
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Click to Enlarge |
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| Specifications of Resitest-400M |
Measuring Method: Electric Resistivity using Wenner sensor
Pulse Voltage: ±15V / 22.2Hz
Measuring Range: 0 ¡ 20 k§Ù / 20 ~ 200 k§Ù / 200 ~ 2,000 k§Ù
Display: 3 1/2 digit LCD
Resolution: 0.1 k§Ù / 1k§Ù
Measurement Accuracy: ¡¾1 k§Ù
Maximum Range: 2,000 k§Ù
Power: 6 x 1.2V AA Rrechargeable Battery
Battery Life: Continuously 4 hours
Display: 3.2" TFT Color LCD
Size: 105(H) mm ¡¿172(W) mm ¡¿ 68(D) mm
Weight: 990 grams (main body)
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