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Product Description Specification
External Connect Thread Diameter: G1/2 inch (BSP)
Withstand Range: Water pressure 1.75 Mpa below
Pulse Frequency: F=7.5 * Q (L / Min)
Working Voltage Range: DC 3-24 V
Maximum Current: 15 mA(DC 5V)
Load Capacity: ≤10 mA(DC 5V)
Flow Range: 1-30L/min
Insulation Resistance: >100M OHM
Storage Temperature: -25℃～+80℃
Storage Humidity: 25%～95%RH
Operating Humidity: 35%～90%RH
Operating Temp: ≤80℃
Cable Length:15cm
Tolerance: ±2%
Output Waveform: Square Wave,output pulse signal
Three wire connection guide:
Red for positive, Black for negative, Yellow for pulse signal.
Outlet with 2m/6ft NTC Temp Sensor
DCFusor
2025-08-16 18:30:37
Been using these for a long time as part of an automated rain collection and use system. I use these to know when the flow stops, and monitor transfers between tanks. They don't like to eat twigs but hey, what would you expect? They won't always start on very low flows, but again, they are a very good trade-off for what they do at the price. The one I took apart (to remove a twig and fix some damage caused by wearing against said twig) was very well built and without having eaten something I shouldn't have let in there looks like it would have lasted more or less forever, and never leaked.
Trish
2025-08-14 11:55:26
Love this ... unlike magnetic reed switch sensors this wont stall in a polarized location giving a false impression of flowing. it is also very sensitive to low flows which a reed switch cant do unless there is a threshold flow
alexw
2025-07-24 14:28:45
Only 2% accurate, but the calibration factor specified as 7.5hz/(l/min)=450pulses/liter seems to be quite off as well. After averaging a couple of tests, I've calculated it to be more like 13.25hz/(l/min) = 796 pulses/liter.
Enrique Torres
2025-07-20 17:44:32
It is not to much reliable
H
2025-06-08 14:58:09
Got it to work. After testing and calibrating I found that using 6.5 instead of 7.5 as the multiplier gave much more precise readings. Anyone agree?
Rand A. Beveridge
2025-06-06 12:23:56
I have this hooked to an esp32 (flashed with esphome) that talks to a RPi running Home Assistant and it's measuring the flow of water going to our garden. Works great.
Stephen
2025-03-15 15:16:42
Works very well and accurate. Added 0.1 cap on input for noise.
RW M
2025-02-09 14:15:04
Seems to report relatively accurate flow.
Verna
2025-01-22 16:20:11
I used these meters in my hydroponic green house for one season and am very impressed
Customer
2024-12-31 15:22:48
Searched for a long time trying to find a replacement sensor for my Coleman hot water on demand Although the cord wasn’t long enough I just spliced and soldered the old wire on and it works great
PHM
2024-12-19 16:18:55
So far it is good.
jim R.
2024-12-11 12:04:39
The website was not helpfulI did find out that longer cable lengths were available, but no info on how to specify
totally
2024-11-20 14:22:12
The product I received was actually the FL-608 and not the FL-408 as specified in the product information here. It has slightly different stats but so far I am able to read the pulses in my test setup. I have not hooked it up to actual liquid flow yet to calibrate it but I believe it will work well for my situation.
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