How to check the insulation of the induction melting furnace?

Before the inductor of the induction melting furnace is supplied with water, check the inductor’s ground insulation and pressure resistance. After removing one end of all the rubber tubes on the sensor and allowing the sensor to fully dry, use a megohmmeter to measure the insulation resistance of the sensor to the ground (furnace body) and it should be no less than 1MΩ.