Question: Equipment for low-current protection (to prevent vacuum formation) in centrifugal pumps
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The unit has a centrifugal pump of the model IH50-32-250b. The motor has a power of 11 kilowatts, with an operating current of around 23 amperes. The operating condition is not continuous use. This causes mechanical seals to be damaged frequently due to evacuation. When there is no load, the current should be lower. May I ask how low-current protection can be achieved? What equipment is needed? How much will it cost approximately? Thank you
Why set an interlock that shuts down the pump when the liquid level is low? If the level drops, the pump will stop automatically, won’t that do the same thing? And it will get better.
Install a level switch or level transmitter； A pressure switch or pressure transmitter can also be installed after the pump.
External flushing water should be able to solve your problem
Let me help you analyze the situation first. There are currently two methods available. One is to use a level sensor along with a transmitter, and set up a level interlock; if domestic products are used, the cost will be around 3,000. The other method is to use a current interlock – when there is no load, the current decreases, but this approach isn’t very reliable, especially with fluids that have a low boiling point. For fluids with a high boiling point, a relay can be used; it’s inexpensive, costing at most 200-300 yuan.