Product Details

I. Purpose

The FZY-3 Mine Stray Current Tester is a portable rectifier instrument with high sensitivity and multi-range protection circuits. Its features include: wide measurement range, a total of twenty ranges, capable of measuring AC/DC stray voltage and stray current separately, no internal power supply required, safe and reliable. It is suitable for testing currents and voltages generated by steel rails, water pipes, cables, etc. in coal mines, preventing premature detonation of electric detonators and other combustion and explosion accidents caused by stray current discharge, minimizing fire sources in mines.

II. Performance

Measurement range and accuracy class of the instrument

    III. Usage Methods and Precautions

1. Before measurement, screw the test lead connectors tightly onto the two binding posts, and adjust the meter pointer to the zero scale line.

2. Place the test leads connected to the binding posts on the two points to be measured (e.g., steel rail, water pipe, cable sheath, coal, earth, 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 selector switch to the appropriate range, 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 is not detected at a location, also test for DC stray current, and vice versa.

5. When measuring stray voltage, the corresponding 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 is found.

7. When the measured current exceeds 5A, the instrument should only be used for short-time measurements; when it exceeds 10A, only for instantaneous measurements, to avoid large currents 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, set it to the "OFF" position.

IV. Product Completeness

1. Main unit               One unit

2. Test leads           One pair

3. Product manual         One copy

4. Product certificate of conformity     One copy