If the output signal is a pulse, what is the pulse rate per liter and duration per pulse?

The current image shows an "F" number of 7, which means 7Hz per liter/min, so 7 pulses per second indicates a flow rate of 1 liter/minute, hence 7 * 60 seconds/minute = 420 pulses per liter (per minute). I have no idea what the duration would be.

Does it prevent back flow or what happens if water does try to go in wrong direction?

It does not have any backflow prevention. It is a little water wheel inside a pipe which has magnets in the vanes of the water wheel. The unit simply counts magnetic pulses as the wheel is moved by the water flow. It would probably register water flow either way but would only be accurate in the forward flow direction. Any domestic water system should have backflow preventers in place to keep drinking water contamination from occuring.

Are the threads npt, bspt or bspp? please understand this is basic info should always be provided without having to specifically ask. thanks.

Hello, thank you for your inquiry. It's BSPT.

If the flow rate is less than 1L/minute, will it not not show any pulses? I'm interested in using this to detect leaks and 1L/min is a lot of water.

I don't know about 1L/min, but I have tried pumping liquid through one using a dosing pump and nothing registered. The water wheel will have some resistance, so a very slow flow might not register.

2 Water Flow Sensor Food Grade Switch Hall Effect Flowmeter

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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QAR 209

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Description

💧 Flow with confidence, measure with precision!

PRECISION FLOW CONTROL - Accurate ±2% measurement for reliable fluid monitoring
LEAK PROOF INSTALLATION - Sealing ring guarantees firm, water-tight connection every time
ROBUST FOOD GRADE BUILD - Durable, ROHS-compliant plastic ensures safety and longevity
WIDE INDUSTRY APPLICATION - Perfect for irrigation, petrochemical, residential & waterworks use
VERSATILE VOLTAGE COMPATIBILITY - Operates seamlessly from 5V to 24V DC for flexible setups

The 2" Water Flow Sensor features a hall effect flowmeter with a broad 10-200L/min range and ±2% accuracy. Crafted from food-grade, ROHS-compliant plastic, it supports DC 5-24V operation and withstands water pressure up to 1.75Mpa. Designed for leak-proof installation with a 2" male thread, it’s ideal for diverse applications including irrigation, petrochemical, and residential water control.

Specifications

ASIN	B07MY6JHNR
ASIN	B07MY6JHNR
Batteries Included?	No
Batteries Required?	No
Customer Reviews	4.0 4.0 out of 5 stars (13)
Customer reviews	4.0 4.0 out of 5 stars (13)
Date First Available	1 September 2019
Date First Available	1 September 2019
Is Discontinued By Manufacturer	No
Item Weight	209 g
Item model number	GR-216
Item model number	GR-216
Manufacturer	GREDIA
Manufacturer	GREDIA
Material	Plastic
Package Dimensions	16.79 x 14.81 x 7.19 cm; 209 g
Package Dimensions	16.79 x 14.81 x 7.19 cm; 209 g
Part number	GR-216
Size	G2" male thread
Style	G2" male thread

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