DIGITEN 1/4 Quick Connect 0.3-10L/min Water Hall Effect Flow Sensor Meter

I got this to keep track of water usage on my RO system so I would know when to replace the filters.This meter works as expected but I wouldn’t trust the calibration. Anyone setting this up should calibrate it on their own. I marked a line on a jug that was exactly 1 gallon and took the average of filling 5 gallons. I found that on average I got about 8120 pulses per gallon. Knowing this I can now keep track of total volume and flow rate.Keep in mind that low flow will not measure the same as high flow. This is fairly common in turbine style meters so calibrate your pulses per gallon at about the same flow rate you expect to use it.I just installed this today so I can’t speak to its longevity but so far no leaks with 55 PSI on the meter at all times.Overall I would say it’s a good meter as long as high accuracy isn’t your goal but for the price of this meter I’d say it’s worth it.

I am using this sensor (0.3-10L/min) with the Digiten DFC15 Liquid Flow Controller...Here is what you need to do...1. Swap the yellow and black wires on the sensor. (The yellow wire should be in the middle.)2. Plug it in to the DFC15.3. I needed to use a K-Factor of 72.4 for my system. Please note that this value is for Gallons. If your unit is in Liters then the number will be different.I use mine to monitor a reverse osmosis system. The unit is very sensitive and displays very low flow rates with great detail.Good luck.

Disclaimer: I don't have the equipment to verify the flow rate or accuracy. My use case is to check if whether flow is occurring or not!The construction is simple. I dismantled one and found a hall effect sensor and one pull up resistor. For reliably purposes, I need the sensor isolated from the 5V and 3.3V rails that power the microcontroller. To suit my needs, I removed the 10k resistor so that it can sink current through an optocoupler.I'm disappointing that this sensor is not RoHS compliant (though it claimed it was). I dinged a star because it lacked anything that could remotely be called a datasheet. If anyone knows the hall effect sensor used please let me know. The part number I read off the IC is "A501 103". It could possibly be a knock off to Allegro's A1101 hall effect sensor but I'm not sure.

The FL-S402B flow meter is pretty amazing! The quick connects snap right onto 1/4" ID plastic tubing for easy setup. I connected this to my Raspberry Pi and my Reverse Osmosis system with ease. This unit appears to be much more sensitive than FS200A G1/2 meter I had been using, but I will have to do more testing to see how accurate it is. It should deliver 1,380 pulses per Liter, according to data I found online. I'll try to update this review when I learn more about the accuracy.The plastic locking clips are very difficult to remove, I'm guessing because of the extra sturdy plastic. When I tried to remove them by the tab I just broke the tab right off. I suggest pressing needle nose pliers against the two ends of the clip firmly to pop them off (they will go flying). I have a couple locking clips that are much thinner from some other quick connect fittings, and they are somewhat easier to remove from this meter. Also, the quick connect fitting requires a very clean plastic pipe to prevent drips at high pressure. This is typical of various quick connect products (even some high end ones like this meter), though some are more forgiving that others. Just use a razor blade and make a fresh, vertical, clean cut on your 1/4" ID tubing to make your connection leak free.

So I had to replace the water flow sensor on my fridge since it broke. It is on back order for months and I wanted my ice and water back. I thought well it’s 10$ let’s try it. Well if you cut the end off this and wire it up too your plug going to fridge it will work. The pic above is what the stock water sensor is. Enjoy this and hope you get your fridge working to.

I contacted Digiten about this and they said "The flow sensor you purchased separately is a conventional flow sensor and cannot be used directly with DFC15." If you're going to make a product not compatible with your own controller then at least put that in the product details. Now I have to go buy the correct connector (3 pin JST SM) and rewire this.Also, people are stating K value for this sensor is 23. Perhaps this is the Gallon value, but for Liters that was 40% low. I needed a K value of 32.2 for 1L of actual fluid to match 1L on the meter.Also, some people are complaining about leaks. I think this is user error. You have to insert the quick connect hose pretty far into the meter to get leak free connections.

The media could not be loaded. Good flow meter - see VideoNote: The correct Flow(Q) needs a calibration factor based on actual testing. I timed the filling of 500ml (several times) to get the value. **The Flow calc shown on the device does NOT match the description**The flow meter has one Hall sensor that pulses @ 60Hz with code, so it makes is easy (just like a Tachometer) Photo of O'Scope.