Rotation Tester and AC Detector for Circulating Pumps etc

The media could not be loaded. Bought a house that had a Watts 500800 Instant Hot Water recirculation system. There were two "sensors", one in the kitchen, the other in the master bedroom. These sensors are valves that are installed between the hot and cold lines under a faucet. They close in response to hot water, and open when the water cools. The idea is that, when the "hot" water near the faucet isn't hot, the valve opens, and the pump (which is on the water heater hot output) forces water through the hot line, then through the open valve, into the cold line. When really hot water reaches the valve, it closes. So, when you then tun on the hot faucet, the water is instantly hot. Correspondingly, because some warm water has been pushed into the cold line, when you turn on the cold faucet the water is a little warm, but it quickly cools down as the hot water gets flushed out.The system didn't seem to do much. Took a long time to get hot water, especially in the master bedroom at the far end of the house. I wondered if the pump was working. I could hear a noise, but didn't know if it was actually rotating. Eventually, I bought this indicator, and held it up to the pump, at the water heater. It didn't spin. So I got a rubber mallet, and gave the pump casing a couple of fairly gentle taps. Held the indicator up again - it was spinning (more slowly than I expected, but definitely spinning). That night, my wife complained that the cold water in the master bedroom was running hot. So I tested the sensor/valve and, sure enough, it wasn't working - it did not close, even when the hot water faucet was pouring out near-scalding water. We had not experienced the "hot cold water" before, because the pump wasn't spinning, but thanks to the rubber mallet, the pump had been constantly pushing hot water into the cold water line.Next day, installed a new (steel) sensor/valve. Now everything is working well. Since I probably won't need to use the indicator for anything else, I've taped it to the pump. See video. Turning like a champ.So an $18 outlay saved me from paying a plumber, and helped me turn a failing system into a working one.

Works

Didn’t work as expected.Didn’t picked magnetic field.Tried in different types of motors and didn’t work in any!

A refrigeration tech - magnet does what it should- legit - asset operational - leaving call open to check ops later .

I tried this on two Grundfos pumps, and it worked on both, indicating the pump was running. Otherwise, it is difficult to know or not as at least my pumps are very quiet, and it isn't a sure thing the pump is running otherwise. Some state the product doesn't work; I can't report that. For $20, I'm very happy with the product.

Does not seam to spin free . But that may be the reason it kinda rumbles. If it gets high current power wire you will know. Also solenoid will just set the thing off. Spinning and vibration quickly and easily.

I ordered 2 and only received 1They work great

simple and effective.