Aopin Water Level Sensor Switch Stainless Steel,Liquid Level Sensor Float Switch, Plastic Ball Float Controller For Water Pump Fish Tank Cistern Sump Filter Aquarium Swim Pool Garden Pond Liquid 1 Pcs

This level switch is being used to activate a pump (via a relay). I found this to be a perfect, simple solution at a great price. Mine came in the Normally Closed (N.C.) position, it takes about 10 seconds to flip it around to make it Normally Open (N.O.) as I needed. This can be determined with a simple multimeter or continuity tester.With the set up I created the switch will activate the relay and then pump when the water level reaches a chosen height. A device that draws less amperage, e.g. an alarm, would not even need a relay. In the N.C. position it can be used to shut OFF a device such as a valve/solenoid when the vessel filled. The switch does not have a bracket but is able to accept one very easily.The whole mechanism is very well built and I predict will be in service for some time.

Using this to monitor water level in a swimming pool in conjunction with an ESP8266. Selected this one (model ZS12010-2) as it is stainless, claims plated contacts on the internal reed switches and is about the right size for my application. The black pair of wires correspond to the lower float. The red pair for upper float. Working well with 20 ft of wire from float to microcontroller. Too early to tell how it will hold up over time. A more detailed description can be found at the outpost4 dot org blog.

I am a little suspect of the quality they look and feel light duty, but that being said they work great. I will update my review after 3 or 4 years of in service use. I have had no issues with floats once I installed them in a suitable manner.

I needed a way to protect my heated parts washer from frying the heater when the water level drops too low. This thing is perfect!

Ordered 1 for hydroponic watering. Switch controls a 12vdc pump that draws 300ma. The first switch failed to reliably cycle on/off and was promptly replaced. While contacts are rated at 500ma and pump draws 300ma I believe pump startup current spike exceeds 500ma rating causing contacts to stick. Ended up using $5, 12vdc EMR (general purpose automotive relay) from auto store with this switch. Relay/switch combo has been working like a charm for 3 weeks. Was impressed with solid stainless construction and claim of up to 2 million cycles.

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