DIGITEN G3/4" Water Flow Hall Sensor Switch Flow Meter 1-60L/min
Easy to install.
Frequency: F=5.5 * Q (L / Min), error:2% voltage :3.5-24VDC, current can not exceed 10mA, 330 pulses/liter, F=Constant * units of flow (L / min) * time (seconds).
Maximum current:15 mA(DC 5V)
Working voltage range:DC 5-24 V
Load capacity:≤10 mA(DC 5V)
Operating Temp:≤80℃,Operating humidity:35%-90%RH
Allow compression:Water pressure 1.75 Mpa below
Insulation resistance:>100M OHM
Output Waveform:Square Wave,output pulse signal.
G3/4" Flowmeter x 1
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this does not have 3/4" fOD ittings as I was told by their sales staff. It has 1"fittings. It has a 3/4" ID
Great flow meter! I used three to monitor various flows going into my aquarium. Doesn't disturb the filter flow at all.
Despite what the other reviews have been saying, this has a standard 3/4" MIP thread. The same thread that's used on garden hoses and plumbing parts. It's very easy to find pvc and hose barb adapters that fit it.
I am very impressed with this flow sensor. I purchased two to be used on my African Cichlid aquarium. I have two canister filters--and I didn't notice that my flow was significantly reduced before I went on vacation during the 4th of July weekend. Came back to several dead fish... :(
I am using this with a Particle Photon combined with the Blynk app to remotely monitor the flow and alert me if the flow is below a threshold.
I found barbed tube (5/8") fittings on McMaster, part # 5372K218.
The sensors have a 3 pin JST connector (available on Amazon).