DIGITEN FS-C02 G3/4" BSP Male Thread Brass Water Flow Switch 1-30L/min, 0-2A/ 0-220V(AC or DC)

bueno

It works well. I had to buy two 3/4” G Thread (BSP) Female to 3/4” NPT Male Connector (like ASIN B0B74F451Y). It is very difficult to get the connection not to leak, even with a lot of Plumber's Tape between the flow sensor and the BSP to NPT adaptor. However, I inserted a hose washer in between and did not need Plumber's Tape. No leaks. See photo of the hose washer. Use this one , not the orange type because the orange will expand inside and reduce the flow. I read here that some people do not use BSP to NPT adaptor and use a lot of Plumber's Tape. So, a hose washer, may be a solution for that too.

This is the second flow switch I bought through Amazon, two different styles , first one outer casing was defective had a pin hole, this one I still have hooked up, it is controlling a recirculating pump for tankless water heater running through a relay so pump only runs when water starts flowing. The problem is that the NO contact does return to the open position , allowing the pump to keep running, if I tap on it with a screw driver it returns to open and turns off the pump. Two for two 🤔🥴

The 1st one I ordered did not work properly, Amazon sent a replacement quickly and that one works well. You will need the 3/4" adapters to go from UK to USA. Be sure to seal the threads to the adapter real well. My 1st attempt had a small drip. Needed to disassemble and use Teflon tape + thread sealant compound to get a leak free seal. It's operating well as of today.

I have a hydronic cooling system in my house and needed a flow switch to serve as a safety in case the pump failed and froze the heat exchanger (as happened before). I previously intalled an expensive McDonnell & Miller flow switch but it stopped working within a year. This device uses simple and sensitive magnetic technology instead of a "sail". The downside is the threads are not tapered pipe thread type and are square. I used my pipe thread die to work them over, but when threading it onto a female adapter it was too loose. I removed the plastic actuator and internals and soldered it to copper adapters and added unions, which worked fine. Even given this, I would buy one again as there is nothing on the market that is as inexpensive and failsafe.

Though this was stressful getting it to my door. This does a great job as on demand inline hot water switch. Saving money by not cycling the boiler through a thermostat. Only running when the tap is turned on.

Going to give the goods on this as well but want to get straight to the point for those who are buying in the US. This product is advertised as BSP. There are two types of BSP. BSPT - Taper & BSPP - Parallel - which is what this is SUPPOSED to be. This means the diameter at the very beginning is exactly the same as the diameter at the end. Unlike National Pipe Thread that has a taper, BSPP does not. That would still be solvable with NPT adapter and a washer and/or pipe tape/joint compound (as indicated in the product description. The problem is that the threads on the one I received were not cut with a BSPP die. The threads are perfectly square instead of having a 55deg angle. See the picture attached. No angle on the thread. A female NPT adapter should thread onto a male BSPP without issue - it just won't seal well. But my 3/4" female NPTs will not thread on even 1 turn of threading because the threads are square instead of angled. Maybe I got a bad one - as others have indicated success with teflon tape... As far as the GOODS go. This product should be exactly what I need. A low flow sensing valve. It is pretty slick the way it works. There is a plunger (object on right in second photo) that seats against the input end of the tube. When even a small amount of water flows, this plunger slides towards the outflow end. There is a magnet on the output side of the plunger and the external mounted sensor can sense this magnet through the brass, closing the circuit. This is NOT a hall effect flow meter. Just a magnet moving inside the pipe. But the beauty of the design is that there is no penetration thru the brass body. Magnetism works through brass - so the sensor switch never touches the water. Also clever is that the retainer nut (on the left) also has a magnet in it. The magnets are oriented such that they repel each other. The plunger moves forward and the retaining nut magnet pushes back. No spring to clog or corrode! When flow stops, the magnet is strong enough to push the plunger backwards and the switch is deactivated. The plunger moves about 1/4" which is enough to activate the switch. And as soon as the pressure is released, the other magnet repels strong enough to seat the plunger back in the circuit Normally Open position. A couple of other notes that are neither a features or a detractor.s Just something to realize. The plunger does not have a seal so when it is seated a very small amount of backflow is possible. This is NOT a check valve. That being said - it will not allow A LOT of flow backwards. In my application, I need to sense flow out of pressure tank. But water has to flow back into the pressure tank as well (at a slower rate). So this MIGHT have restricted the flow rate for the tank to fill - but since I never got that far I cannot confirm. I just can tell with air flow that flow is restricted in the reverse flow direction. The arrow indicates flow direction. This will absolutely work with the arrow parallel to the ground. It will likely work with the arrow pointed up but won't be as sensitive to flow rate because the flow has to lift the weight of the plunger. It MIGHT work with the arrow pointed down because the repeller magnet seems to hold the plunger in place on my bench and the switch does not close. But it takes very little force to move the plunger since the weight of the plunger is pulling "down" and the repeller magnet is pushing all the time. If the strength of the permanent magnets ever weakened, it might not be enough to hold it in the open circuit position. Should be 5 stars as it is a simple and practical flow switch - but with the threads cut incorrectly, I have to drop it to three. Even if I had a BSP adapter - I don't think it would thread on because of the square cut of the threads. Square threads are normally for machine drive parts - so either the die was damaged or someone really didn't know what they were doing when the turned up the threading machine.

Works as intended. Used it as a flow sensor on a pressure washer. Combined with a 110Volt relay, it switched the electrical motor on immediately when the wand was triggered.

Working well! I'm using it in a Ozone water treatment system. This switch controls a 12 volt relay that switches on the ozone generator when incoming well water flows. Contrary to what some other reviews have said this does not need to be mounted vertically as there is a small spring inside to control the switch, if yours is missing the spring it is faulty and should be returned!

not sure it works info sucks my pump did not shut off

Product works very well.

Works perfectly to shutoff heater if circulating pump fails . I use it to trigger a 40 amp relay . Dislike adapting BSP and NPT. the adapters are expensive. I could not stop leaks so ended up soldering the fittings together solving the problem. Overall an excellent product.

Poor threads. Leaked from beginning. Installed according to specs. Used A/C power but failed immediately upon switching on. Junk