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I have a system that tests a product's water tightness by using a pump to remove all the air. When it reaches a certain value it turns off to test the product.

I have just bought another pump that I want to integrate into the system so that when the first pump is on, the second also turns on and when the first pump is off the second turns off. The first pump is linked to a controller which determines the on/off state. But the second pump has to be plugged into mains power and I am unsure how to link the two.

I have mainly worked with smaller, low power elements with an arduino so I am unsure how to go ahead.

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    \$\begingroup\$ hi! Welcome here. That's good context you're giving here! (I do have a few questions, though.) It really helps if you can think of a single, precise question. "how to get started?" is a bit broad for an authorative answer :) \$\endgroup\$
    – Marcus Müller
    Commented Jan 13, 2022 at 9:55
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    \$\begingroup\$ questions: "when it reaches a certain value": When what reaches a value for what as observed by what? \$\endgroup\$
    – Marcus Müller
    Commented Jan 13, 2022 at 9:55
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    \$\begingroup\$ "first pump is linked to a controller", "second pump…" : need datasheet or at least types of all three elements. \$\endgroup\$
    – Marcus Müller
    Commented Jan 13, 2022 at 9:56
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    \$\begingroup\$ Please draw a block diagram of what you have and how it’s connected, and we’ll help you from there. \$\endgroup\$
    – winny
    Commented Jan 13, 2022 at 10:17
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    \$\begingroup\$ Thanks everyone for your help. The air pump that is connected directly to the controller is 4m³/h and the new one is 16m³/h. The controller reads the pressure inside the product and when the ideal pressure is reached, the pump is turned off. The new pump has been purchased to make the process quicker. \$\endgroup\$
    – Lewis Goodall
    Commented Jan 13, 2022 at 11:04

1 Answer 1

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The wire to the first pump (the MCU-controlled one) can be observed with a Hall sensor, and that could trigger a relay turning on/off the second pump (High-voltage one).

There's a diagram in the UGN5303 datasheet for such usage of Hall sensors (current monitor).

Or better than that, if the systems are not isolated, both pumps could be switched by the MCU at the same time (of course through MOSFETs/relays/SSR/etc. depending on motor requirements).

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