GREDIA 3/8" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 0.3-10L/min

I made a project with a RPi5 to monitor my coolant for my laser cutter/etcher. I used this to make sure that I was getting flow from the coolant output of the laser to verify that there was no issues cooling the laser tube. I connect this sensor to a custom cable and 3D printed adapters for my coolant pipes. The system screen flawlessly tells me whether I have flow and how much!

Functions well, but does not come with technical specs.

Buena calidad

Excelente producto

I received the 3/8" pipe threaded connector model, installed it, turned on the water, and watched water seep out through the threads. I used teflon tape, the female threads are in new, brass fittings (no wear). I am returning these. That said, I also ordered, received, and installed a similar meter that uses 1/4" shark bite connectors and that one does not leak at all, so I will be replacing the threaded model with a shark bite model. UPDATE I have three of these installed in my device, all different models. I found the threads on the threaded models to be "European" v. "American" and so not useful for me - the threads leak and the suggested solution is to load up on thread seal, which is not acceptable. That said, I do have a 201 and its threads seem to work well with my "American" threads. The shark bite models have never leaked and are very easy to install, especially with poly tubing. One of those, a 301, runs continuously for 10-14 hours, most of the time "dry", driven by a vacuum pump, and can get very noisy.

As info, I ordered/received the 2pc Gredia GR-R401 G1/4 Hose Pipe flavor. I got 2 so I could disassemble one and have the other unfettered in case I destroyed the one I was frackin with. I am using this on a water cooled 3d printer hot end, to give Klipper programmatic flow indication. These are 3 full pulses per revolution (6 edges). As another user reviewed, there is a reduction of the ID on the inlet side of the flow meter. I presume this was so that there was a focus of pressure on the rotor blades. It is 1.5mm in diameter (checked with a 1.5mm shaft). At ~35 deg C coolant temp, I am getting ~900-1000 PPM (~333 rpm @ 3 PPR). As the fluid warms, it becomes more viscous and flow increases. I am happy with the product. I opened the orifice on the 2nd unit to 2mm and will test to see if I get comparable usability with the larger orifice, and see if I get overall better flow/performance from the cooling system.

accuracy quite low.

Do not get. They all leak.

The rotary blades used within this hall effect flowmeter are tapered such that they have a variable width. Because of this, water can easily pass through gaps between these blades and the flowmeter casing which basically renders flow data as garbage. Digiten also utilizes this completely useless design. Do not buy from either of these companies

I use it to track usage/flow rates for my RO unit. . Connected to a ESP8266 & works fine with 3.3v supply .. simply connect it directly to a GPIO pin. Programmed the ESP8266 using ESPhome & use InfuxDB to store the data, Grafana to display. For example, to measure L/hr configure ESPhome as follows: - platform: pulse_counter pin: GPIO5 name: "Pulse Counter" update_interval: 60s filters: - lambda: return (x / 38.0) * 60.0; unit_of_measurement: "L/hr"

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With a little Teflon plumbers tape, this fits no problem with the standard G1/4 fittings used in most custom water cooling loops, and plugs right into a standard fan header to meter flow. A cheap and efficient means of ensuring that the water isn't obstructed in any way. For the record, water flow rate has negligible impact on overall cooling - just so long as there is flow. As such, I use this to set an alarm a,d shut down the computer - should the flow ever stop. cheap insurance.