Mag-Probe Method When Troubleshooting
Intermittent Solenoid Valve Coil
An Intermittent Solenoid Valve Coil can be very hard to troubleshoot as you will see in the video below.
Mag-Probe Method to Quickly Trouble Shoot An Intermittent Solenoid Valve or Leach Relay Coil
When Troubleshooting an Intermittent Solenoid Valve Coil or a Leach Relay Coil sometimes the following problem occurs, and when it does it can shut a manufacturing production line down for hours. Whenever I test a solenoid valve or relay with the Magprobe and the LED light does not come on it’s an electrical problem. So I measure the voltage applied to the coil to see if it’s present. Next, I turn the power off and make a continuity measurement of the coil to see if it’s OK. But how is this possible if the coils resistance checked okay and the voltage was present? You should have current flow through the coil and you don’t. You have an Intermittent Solenoid Valve Coil problem. Why is that?
The LED should light up when voltage is applied to the solenoid valve or relay coil because current flowing through the coil is what generates a magnetic field. The magnetic field in turn energizes the MagProbe and the light comes on.
Now you know the coils windings must be opening when the voltage is applied. This Intermittent Solenoid Valve Coil problem was caused by a tiny opening in the coils winding that occurred when voltage was applied. When current flowed through this tiny spot on the coil it caused heat and resulted in expansion of the tiny contact which caused it to Open and Interrupt the current in the coil. When this happens a magnetic field Will Not be Produced and the Magprobe LED will not light. No Schematic is needed to make this test.
With the voltage still applied, the coil cools down and results in wire movement causing the tiny separation to reconnect. Once it reconnects you can now measure the magnetic field and the Mag-Probe Light will come on. This is how to easily you can find an Intermittent Solenoid Valve Coil problem using a Mag-Probe.
Intermittent Problem Solved.
Bartol Research Mag-Probe
Mag-Probe Method Testing Intermittent Solenoid Valve Coil
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Inventor Bob Bartol at 208-321-7566 or Email Bob firstname.lastname@example.org