LABORATORY WENNER TESTER

Description

model: PT402

General Description The PT402 Wenner tester is a low cost and efficient laboratory testing instrument for measuring soil electrical resistivity using the Wenner 4 electrode method and covers all the requirements of the ASTM G57 Standard. This instrument provides the specialists with valuable information in various applications including soil corrosion investigations. The Wenner test is literally the most important test in AWA C105 which is the common standard for pipeline design. One of the advantages of the laboratory Wenner tester over the conventional field testers is that the soil samples can either undergo the test directly or can be tested under different conditions like saturation with distilled water.

 

Applications

• Corrosion Potential Evaluation
• Water Soluble Salts Concentration Measurement
• Earthing System Design

Test Method

The PT402 tester is comprised of a soil box and an electronic measurement and display unit. The soil box is connected to the electronic unit via 4 cables, which are used according to ASTM G57 requirements to measure electrical conductivity based on Wenner 4 electrode method. As the sample is filled in the box and prepared according to instructions, the electrical resistivity is measured and displayed on the electronic unit.

 

The tester has a wide dynamic range and can measure high electrical resistivity of distilled water down to very low resistivity of saturated salt water. Since the ASTM G57 standard demands the electrical resistivity to be measured at 25 ° C, measurement errors due to ambient temperature changes become a matter of concern. The PT402 has a built-in temperature sensor which measures the ambient temperature and compensates for the resistivity measurement errors, so the displayed resistivity can optionally be calculated for 25°C. The instrument calibration can be assessed using calibration resistor board which is supplied with the PT402 soil resistivity tester.

specifications

Parameter	Range
Resistivity Measurement Range	7 mOhm.cm … 700 MOhm.cm
Operation Ranges	Low Range: (0… 70 Ohm.cm) High Range: (0… 700 kOhm.cm)
Measurement Accuracy	%1 (0… 70 Ohm.cm) %1 (0… 700 kOhm.cm)
Range Switching	Automatic
Measurement Method	Constant Current AC excitation
Excitation Frequency	97Hz
Temperature Measurement and Compensation range	0… 50 °C
Temperature Operating range	0… 50 °C
Power Supply	External DC Adaptor, 5V- 1A
IP Class	IP 54
Display	4.3” Color LCD, 480 x 272 pixels
Dimensions	22.8cm X 15.1 cm X 5cm
Weight	500 gr.