Product Details

The mining stray current tester is suitable for testing the current and voltage generated by steel rails, water pipes, cables, etc. in coal mines, preventing stray current discharge and reducing the fire source in the mine to the lowest limit.

Performance of the Tester

Measuring range and accuracy class of the instrument

Precautions

    1. Before measurement, screw the test rod wires into the two binding posts respectively, and adjust the meter pointer to the zero scale line.

2. Place the test rods connected to the binding posts on the two points to be measured (e.g., steel rail, water pipe, cable sheath, coal, ground, etc.). The two measuring points should be on different conductors, with a distance of about 2 meters. Normally, measure every 50-100 meters, or determine test points temporarily as needed. Set the transfer switch to the appropriate gear, and the meter reading, after conversion, gives the corresponding current value.

3. During measurement, ensure the hard alloy tip of the measuring probe is in good contact with the object under test, and the meter should be placed horizontally to ensure accurate readings.

4. If no AC stray current is measured at a location, also test for DC stray current, and vice versa.

5. When measuring stray voltage values, the gears are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A to 20V, and 10A to 40V. (That is, the current value multiplied by 4 gives the voltage value.)

6. When the magnitude of stray current is unknown, first set to the maximum range gear, then gradually decrease to the appropriate measuring gear.

7. When the measured current exceeds 5A, the instrument should only be used for short-time measurement; when the measured current exceeds 10A, the instrument should only be used for instantaneous measurement to avoid burning out components and the meter with large currents.



Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.