Hi I need to install a fan in a container to run in conjunction with a pump. The problem I have is the customer needs the pump to stop if the fan fails. My only idea so far is an airflow switch of some sort. Can any one offer any suggestions. Many thanks.
Thanks for that, the fan is yet to be decided but its to be installed in a steel container that will filter dirty water! Not seen the container as yet its just the fan providing the headache.
We install these in commercial kitchens to control the gas valve. If the extract and intake fans have not been switched on or one of them has tripped, the gas will not switch on.
Choosing the type of sensing depends on how critical the interlock is.
In 99% of cases a current relay as suggested above will do the trick but it won't stop the pump if the fan runs but the air flow fails. If you're pulling air out of the container the inlet could get blocked or vis-versa.
Also, I assume you will be filtering the air and filters block.
What is the application and how critical is the interlock?
Agree with the problem of the fan stalling - it will still take current. I have seen a few various methods of monitoring airflow, a microswitch connected to a paddle installed in the ductwork is probably the most reliable.
Some sort of rotameter setup might work.
I'd expect a pressure switch may be susceptable to blockage, especially in a dirty environment. How dirty is the environment?
Thanks for the excellent ideas, the "water" will be somehow filtered using hydrogen. As yet I have no idea how, but my only concern is the supply for pump and the fan.
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