2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 10-200L/min

Note: it is not a NPT thread so some tape is needed to connect to a NPT thread

I haven't finished integration, but initial tests are very positive.I am running this meter on 3v and so far it's working great. I think there's a small paddlewheel inside that spins to count flow; I don't have measurements on precision yet, but the numbers I'm seeing show it to be quite sensitive indeed.I've connected it to a SEEED Xiao ESP32C3, and configured it with ESPHome as a pulse counter, and then integrate that pulse counter into a volume measurement. I still have some work to do on the calibration, but very pleased with this so far.I haven't compared it to others, and I think there are some improvements to be had in sturdiness (it's cheap plastic, but that's obvious from the photos), but overall I am excited to have a working meter.

Some what frustrating that something sold in the US should have non US standard pipe threads. Granted it was clearly stated in the description that it was BSPT not NPT. How many. people know what that means? (British National Pipe Thread vs National Pipe Thread). How many people know the difference. The two adaptors cost more than the original piece! My ignorance is not the fault of the piece.

Perfect for my DIY water usage monitoring system. Accurate readings, durable build, and easy integration with my Arduino project. Threads were clean and fit standard fittings with no leaks. Will be ordering more

the way this unit is designed it blocks of a full 1/2 of the flow so it can direct the rest of the flow into the paddle wheel. Any time you run water through a reduced opening it causes substantial pressure drops at higher flows. The way these units should be designed is so they widen first so when the block off part of the area for the wheel it still leaves a full 1" diameter open. If they had done that it would not have caused such a large pressure drop. It may work ok if you place 3 of these parallel but that is a lot of 1" fittings to pay for.

Works. Definitely seeing the +/- 5% difference in output.A few things I discovered:* The sensor needs at least 8V. I had a 9v power supply left over from some other equipment. However, a raspberry PI can only take 3.3V into its GPIO port. (and no pull-up resistor is needed) So I sent 8V into this sensor, and on the output pin I installed a 10k resistor tied to ground. This dropped the output voltage to around 3.7V.* I wanted to record data in gallons per hour. This is from my most recent calibration where I dumped water into a bucket marked off with quarters of a gallon on the side.total_gal = total_gal + 0.001115 # 897 pulses per gal = 0.001115 gal per pulse. This code runs whenever a change from high to low occurs on the output pin.flow = (count / 897.0)*3600 # pulses/897 is gal per sec. *3600 is gal per hour* the label faces down. There is a lot of play in the spindle inside. making the label face down puts the impeller more directly in line with the water flow* make sure you install it in the right direction. The arrow on the label was correct for me.* I used waterproof automotive plugs, sealed on the ends with caulk, since this thing will be outside measuring the irrigation water usage.

I bought this to monitor water flow on my home's water main. I connected it up to an ESP32 with ESPHome on Home Assistant and it worked well to count the pulses and report gal/min etc. So it works as advertised in terms of measuring water flow....however there a few problems.Firstly, the listing says it is BSPT (British Standard Pipe Tapered)... this is not true. This is actually BSPP (British Standard Pipe Parallel). This means it needs a BSPP adapter to NPT if you want to use this in the US. It also means that that the sealing is done with an o-ring. I purchased the adapters on Amazon but the o-ring seal that came with it was on the inside (like a garden hose).. The threads are not long enough on this device to seat against the o-ring.. so it leaked badly.I tried using PTFE wrap... it leaked... I tried thread sealer... it leaked. Everything I tied leaked at my mains pressure. Then the leak got bigger until BOOM! The threads blew off. Thank goodness I was still standing there to shut off the water.After a day of pondering my life choices up to that point, I decided to purchase the brass version sold by this company. This was also BSPP. I had also purchased dowty seals of the appropriate size (after tons of research on british plumbing standards)... I was able to get a good seal with the brass version with dowty seals and PTFE as a back up.I would say, don't buy this for anything more than a few PSI of water pressure... its way too risky given the catastrophic failure I witnessed. spend a few extra dollars (literally only a couple more bucks) and get the brass version for higher water pressures (like your home's water main).