FZY-III Mining Stray Current Tester
Dary Electric recommends:
Purpose:
The FZY-3 Mining Stray Current Tester is a portable rectifier instrument with high sensitivity and multi-range protection circuits. Its features include: wide measurement range, with a total of twenty ranges, capable of measuring AC and DC stray voltage and stray current separately, requiring no internal power supply, and being safe and reliable. FZY-III Mining Stray Current Tester is suitable for testing the current and voltage generated by steel rails, water pipes, cables, etc. in coal mines, preventing electric detonation and other combustion and explosion accidents caused by stray current discharge, minimizing the fire sources in mines.
Usage and 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 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 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 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 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, only short-term measurement is allowed; when it exceeds 10A, only instantaneous measurement is allowed, to avoid burning out components and the instrument due to high current.
8. When measuring DC stray current, if the meter pointer deflects in the reverse direction, swap the test leads.
9. When the instrument is not in use, set it to the "Off" position.
Performance:
Measurement Range and Accuracy Class
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
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
