North or South Pole sensing Proximity or read switches

[Kal_B]

Hello everyone,

I would like to understand how this gate opener's limits work.
They use North and South pole magnets that activate either close or open limit switches what I can not figure out is what kind of switches can discriminate between magnet poles?

Thanks

 

[MaxHeadRoom78]

See the SS400 range from Honeywell, they have bi-polar, unipolar and latching.

SS400 Series, SS500 Series Latching Position Sensors | Honeywell

Honeywell SS400 Series, SS500 Series latching pPosition sensors are designed for use in many potential low voltage applications. Discover all features.

sps.honeywell.com

 

[Reloadron]

I agree with Max. I have used Hall effect sensors which respond to a N and S pole. Years ago I used some made by Allegro as well as Honeywell.

Ron