G1" Male Thread Brass Water Flow Sensor Switch Hall Effect Liquid Flowmeter Fluidmeter Counter BSP 2-50L/Min（58mm in Total Length）

I was looking for a component to measure the water flow at a water hydrant (outdoor spigot) at my barn so that I could tie this into my home automation system. This not only can give me a warning if I forget and leave the water on (ask me how easy this is to do when it's 400' from your house), but it can also record water usage patterns and total water consumption.Only downside to this sensor (for those of us in the US) is that it has BSP threads. I had to use a total of 4 adapters to insert this sensor between my hydrant and the hose splitter: GHT->NPT, NPT->BSP, (sensor), BSP->NPT, NPT->GHT. So the entire assembly is a little long, but I had plenty of room so not a problem for me. Sensor looks well machined and (so far) has been very reliable.The specified counts didn't match reality for me. By filling a 5 gallon bucket multiple times, I found that I get about 1588 pulses per gallon. Your mileage may vary.I used an underground rated cable to run the power and data lines from this sensor underground and into my tack room, where I placed the rest of the electronics to tie this into my system. This comprised a TTL buffer (as the output of this sensor has very little drive capability), then a voltage divider to reduce the TTL output to 3.3V max, which fed into an ESP8266. Software on the 8266 was built with ESPhome and simply calculates the gallons per hour and total gallons consumed and feeds those to Home Assistant (see picture).

Did not work as described and had to return

works well at higher flows. doesn't report anything below 2-3 L/min. needs calibrating. NPT adapters are hard to find.

Every sensor like this comes with a K factor, understood. However that K factor should be set once and not having to be adjusted every day almost. I am totally fine with adjustments periodically as (fluid) contaminents etc might affect the flow, and therefore require the offset adjustment. However this one requires it to be adjusted too frequently.Also it has BPT (british pipe standard) not NPT, there are adapters for it, another $10 to include.You can't teflon your way out! (tried it!)Separately, I thought this was locally made, but it is coming from the east. As regulations are differently there and there is no formal statement that it is true ROHS compliant, I am worried that it has "relaxed" the implementation.There is always a clear difference why some of the same stuff is more expensive, and the reason is quality and regulation. It's another example of you get what you pay for.

Estoy muy satisfecho con haber comprado el producto con ustedes, la logística y la calidad del producto excelente............

I will buy this unit to see if it will integrate easily with my MAREY model something or rather tankless water heater that had an aluminum bodied flow meter, that was leecking probably all over the place like a puppy pissing in your hands , But I got it for $30 at some thrift shop and had to murderfy it and build my own flow meter, which I eventually replaced with a stainless water flow meter out of a high end (“Eternal flow” or some thing or some thing an OVERcomplicated item (I salvaged), but built like a missile — Lockheed Martin — inside with all stainless steel fittings, Valves, and pre-shaped s.s. tubing, Just like the fuel lines from a rocket engine that NASA uses to shoot things into space)

Most flow sensors I’ve seen complete a circuit when liquid flows through them. This one doesn’t you need a controller for this to work correctly

Be nice if the manufacturer could make a version with US connectors, or point to a source for reasonably priced adapters. It's very difficult to find BSP adapters and when you do they are expensive. I ended up using a hose connector which worked great for my conditions, no leakage. Other than that the flow meter seems great. Very reproducible results.