Mine Stray Current Tester Quotation
Darui Electric recommends:
Mine Stray Current Tester QuotationIts features are:
Wide measurement range, with a total of twenty ranges, capable of measuring AC/DC stray voltage and stray current separately, no power supply required, safe and reliable. Suitable for testing the current and voltage generated by steel rails, water pipes, cables, etc. in coal mines, preventing electric detonator premature explosion and other combustion and explosion accidents caused by stray current discharge, minimizing fire sources in mines.
Usage methods and precautions:
1. Before measurement, tighten the test rod wires to 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 rails, water pipes, cable sheaths, coal, ground, etc.). The two test 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 range switch to the appropriate position, and the meter reading, after conversion, gives the corresponding current value.
3. During measurement, ensure the hard alloy tip of the measuring probe makes good contact with the object under test, and the instrument should be placed horizontally to ensure accurate readings.
4. When AC stray current cannot be measured at a location, DC stray current should also be tested, and vice versa.
5. When measuring stray voltage, the ranges are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A to 20V, 10A to 40V. (i.e., current value multiplied by 4 gives the voltage value)
6. When the magnitude of stray current is unknown, first set to the maximum range, then gradually decrease until the appropriate measuring range.
7. When the measured current exceeds 5A, the instrument should only be used for short-term measurement; when the measured current exceeds 10A, the instrument should only be used for instantaneous measurement to prevent large currents from burning out components and the meter.
8. When measuring DC stray current, if the meter pointer deflects in the reverse direction, simply swap the test leads.
9. When the instrument is not in use, it should be set to the "Off" position.
