Electrolysis uses an electrical current to move ions in an electrolyte solution between two electrodes. This experiment demonstrates the process of electrolysis, which is used in the commercial purification of ores such as copper sulfide ore. Thirty minutes to set up and up to 60 minutes to run the electrolysis. Understand how electrolysis is used in the processing of copper ores.Apply basic chemistry principles to understand the process of electrolysis.These resources are found above Hands-On Activity Objectives A supporting PowerPoint presentation can also be downloaded. The Copper Electrolysis Hands-On Instructional Guide can also be downloaded as a PDF, and contains additional images, a worksheet and answer guide, and a glossary. Reconnect the grounding point that you tested.View PDF Download PowerPoint The Chemistry of Copper Electrolysis Disconnect the alligator clips from the electrodes, and return the test equipment to the carrying case.Ģ4. If the values are within a few ohms (less than 3% change), use the average of the 3 readings as the effective resistance for that grounding point.Ģ3. When the readings stabilize, record the number.Ģ2. ![]() Press and hold the Test button on the tester. Make sure the alligator clip on the blue wire remains connected.Ģ1. Measure from the grounding point to the 72% location.Ģ0. Press and hold the Test button on the tester.When the readings stabilize, record the number.ġ9. Make sure the alligator clip on the blue wire remains connected.ġ8. Measure from the grounding point to the 62% location.ġ7. Record the reading along with the sequence, distance, and increment.ġ6. The final number is the ground resistance reading.ġ5. Hold the button down for approximately 5 seconds while the readings stabilize. Push electrode Y into the soil at the 52% location, and then attach the alligator clip on the blue wire to the electrode.ġ4. Measure from the grounding point to the 52% location.ġ2. Calculate the 52%, 62%, and 72% increments from electrode X to electrode Z.Įxample: If electrode Z is 80ft away from the electrode X (the grounding point being tested), the increments are as follows:ġ1. Electrode Z remains in this position for the duration of the test.ġ0. Push electrode Z into the ground, and then attach the alligator clip on the red wire to the electrode. If you are using an AEMC Ground Resistance Tester for the first time, attach a spade lug to the end of the green wire lead and on one end of the short red and blue wire leads.Īlways measure from one corner of the grounding plate to the opposite corner to get the diagonal distance.ĩ. Lay out the tester, the wire spools, and the electrodes.Ĥ. When testing the controller ground, disconnect it from the system ground.ģ. Isolate the grounding point by disconnecting it from the rest of the system.Įxample: When testing a two-wire grounding point, disconnect the lightning arrestor. Go to the location of the grounding point that you want to test.Ģ. You take a reading at each of these increments, and then compare the variation between the readings to determine the ground resistance.ġ. Then you place the other electrode at 3 separate increments based on the total distance between the grounding point and the farthest electrode. To perform the 62% Method test, you position one of the electrodes that comes with the ground resistance tester in a straight line out from the grounding point that you want to test. This test requires a 3-point ground resistance tester such as AEMC's 4620 or 4630 Ground Resistance Tester. ![]() ![]() The 62% Method (aka Simplified Fall of Potential Test) is one way you can measure the ground resistance at your site. Ground resistance depends on grounding electrode selection, soil resistivity, soil contact, and other factors. Ground resistance is a measurement of the conducting connection between a grounding system and earth.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |