FZY-3 Mining Stray Current Tester
Darui Electric recommends for you:
I.FZY-3 Mining Stray Current Tester Purpose
FZY-3 Mining Stray Current Tester is a portable rectifier instrument with high sensitivity and multi-range protection circuit. Its characteristics are: wide measurement range, with a total of twenty ranges, can separately measure AC/DC stray voltage and stray current, no power supply needed, safe and reliable. Suitable for testing current and voltage generated by steel rails, water pipes, cables, etc. in coal mines, preventing electric premature detonation and other combustion and explosion accidents caused by stray current discharge, reducing fire sources in mines to the lowest level.
II.FZY-3 Mining Stray Current Tester Performance
Instrument 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
|
III. FZY-3 Mining Stray Current Tester Usage Methods and Precautions
1. Before measurement, screw 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 switch to the appropriate range, and the meter reading, after conversion, will give the corresponding current value.
3. During measurement, the hard alloy tip of the measuring probe should make 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 values, the ranges are: 50mA corresponds to 0.2V, 250mA corresponds to 1V, 1A corresponds to 4V, 5A corresponds to 20V, 10A corresponds 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-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.
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, it should be set to the "Off" position.
