FY-3 Series Mining Stray Current Tester
Darui Electric recommends:
The mining stray current tester is suitable for testing the current and voltage generated by steel rails, water pipes, cables, etc. in coal mine underground, preventing stray current discharge and reducing the fire source in the mine to the lowest level.
Tester Performance
Measurement range and accuracy class of the instrument
| Measurement Range |
Measurement Accuracy |
Remarks |
| Current Range |
0-50mA-250mA
-1A-5A-10A
|
AC ±5%
DC ±2.5%
|
Before use, the pointer must be adjusted to zero position, i.e., zero adjustment
|
| Voltage Range |
0-0.2V-1V
-4V-20V-40V
|
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 rail, water pipe, cable sheath, 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 selector switch to the appropriate range, and the meter reading, after conversion, gives the corresponding current value.
3. During measurement, ensure good contact between the hard alloy tip of the measuring probe and the object under test. 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 corresponding ranges are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A to 20V, and 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 an appropriate measuring range is reached.
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 due to high current.
Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.
