6 Pieces Plastic PP Float Switch Fish Tank Liquid Water Level Sensor,Model: DP5200

I love these things for checking different water levels in my aquarium. They are easy to solder wires to and connect to an aquarium controller and I have never had one give me a false reading. These have saved me from having problems with my aquarium many times

The work great and so far have been reliable

I used this to create a Sump Pump Monitoring system and alarm. I needed it to be Normally Open (NO) when the water was not above the set mark and close when the water rose above the float. I installed with the wires down at first since that provide the NO connection I wanted. There was a couple failures where it did not float until the pump turned on and wiggled it a bit (I log to a spreadsheet, so that is how I saw this). I found you can change from NO to NC by taking the donut off and turning it around. That way the donut can hang down and the wires are up. This seemed more reliable. I also installed two sensors in parallel above the high water mark in order to have a failsafe. Only one needs to float up to create a alarm. I only used one for the normal half full sensor. This is not as critical and if I used two, both would have to drop to indicate the water was below. This would create twice the likelihood of failure for that normal operation.

Don’t by these for an ATO set up. They require very still water. Other then that they seem to be just fine.

I bought this product to kill my protein skimmer for my saltwater fish tank once water rises and/or when my skimmer mate tank is full. One worked at first when I tested it with my volt meter and after I connected it inline with my wires for the pump. The others never worked. I then ordered replacements and the first two I tested with AA battery right out of the box went from 1.500 mV to .700 mV. THIS IS DANGEROUS, the reduction in flow will create heat resistance and melt my wires!! Quality measures should be in place to ensure the product being sent out works appropriately.

Great product for the price. Used one (of 6) to trigger an inverter power supply for a backup sump pump system. Float switch triggers 12VDC relay which turns on inverter to run a 120VAC pump from a 12VDC battery. Easy to mount. Threads are clean and strong. Each come with a sealing o-ring on the threaded shaft. The float trips the switch ON as it travels away from the threaded shaft/wire end. About 1-1.5" full travel. So the wires are for sure under water when it turns on. However the wire seal cement looks to be very good quality. Durability should be good but it is all plastic. Well made.

I used this float to monitor the activity of a sump pump (specifically looking for when the water level dropped which indicated the sump pump had run). After trying various other gadgets like a water level sensor (which failed in a matter of days), this float has been working flawlessly for weeks. It is used simply as a switch, with no load in the circuit. It is attached to an A-D converter that is connected to an Arduino Wifi that logs pump activity to a database on a web server. The float acts essentially as a resistor -- either very high resistance when the switch is open, and very low resistance when the switch is closed. I suspect that people who have had issues with this float have a load in the circuit that contains this switch, thereby drawing current through the float. Instead, use the float to send a signal to, say, an Arduino which then controls a relay that switches power to the load. This will keep the current through the float at a very low level. No need for an expensive Arduino -- a basic Nano will do.

The glue that is used does not bond to the plastic nor the wires very well. In the picture you can see the slight crack between the glue and the housing. If the whole thing is put underwater, it will fail eventually due to water seeping in.

This is total failure.. it simply don't work

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