SNS 1/4 Inch NPT Male Thread Pneumatic Adjustable Diaphragm Type Pressure Switch Normally Open and Closed Integrated QPF-N2

Using two of these to detect when my air line drops to 45, and then another for 20PSI - for pneumatic railroad equipment. These work great, very sensitive. Normally-closed Inputs are being fed into a PLC which debounces some of the flutter that occurs when they get close to the setpoints. For the price, these are perfect.

I’m using it as an NO switch to control the vacuum for my sand blasting cabinet so I don’t have to listen to it unless I’m actually applying pressure. Awesome little switch.

Bought by husband for machine

Not only do the normally close contacts never close, the vendor doesn't understand what that means. They apparently don't know their own products or how they work,. After going round and round with them, they wanted me to send a video of the problem so that they could better understand. Do not deal with this brand as the product does not work and you will get no help from the vendor. I am a retired electrical engineer, but it doesn't take an engineering degree to understand how dry contacts work. Stay away

Some reviews complain about the lack of hysteresis, but that’s not what this device does. There are other types of sensors that have on pressures and off pressures, but this one just has a single setting - and it is adjustable! This is just what I needed. The other types are good for turning on and off the compressor itself, but this one just lets me know when a specific pressure is hit. It also has both normally open and normally closed connections. I’ve just started using it but so far is working great.

Does what the description says. Used mine to power indicator lights on my welding gas tanks so i don’t accidentally leave the valves open when not in use. The normally open and normally closed contacts allowed me to power up a red light when the tanks are closed and a green light when the valves are opened. Nice little switch for a decent price.

I was able to adjust the pressure down to 75 psi. It was not hard to use

The media could not be loaded. I like that it works right out of the box and it has options for normally closed or normally open. Either way you look at it. It’s a nice pressure switch and easily adjustable.