FZY-3 Mining Stray Current Measuring Instrument
Darui Electric recommends:
The FZY-3 mining stray current measuring instrument 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.
Instrument Performance
Measurement range and accuracy class of the instrument
| Measurement Range | Measurement Accuracy | Remarks | |
| Current Range |
0-50mA-250mA |
AC ±5% |
Before use, the pointer must be adjusted to zero position, i.e., zero adjustment |
| Voltage Range |
0-0.2V-1V |
||
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, earth, etc.). The two test points should be on different conductors, with a distance of about 2 meters. Normally, measure every 50-100M, or temporarily determine test points as needed. Set the transfer switch to the appropriate gear, and the pointer indication will be converted to obtain 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 instrument should be placed horizontally to ensure accurate readings.
4. When 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 corresponding gears 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 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 large currents burning out components and the instrument.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
