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.

1 2 Water Flow Sensor Food Grade Switch Hall Effect

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Description

💧 Flow with confidence, measure with precision!

DUAL PACK ADVANTAGE - Two sensors included to double your monitoring power or backup your system seamlessly.
FOOD GRADE DURABILITY - Crafted from ROHS-compliant, food-safe plastic for safe water and beverage applications.
PRECISION FLOW CONTROL - ±2% accuracy ensures reliable liquid measurement for your smart devices.
VERSATILE COMPATIBILITY - Ideal for coffee machines, water purifiers, beverage dispensers, and smart campus equipment.
PLUG PLAY INSTALLATION - Compact, lightweight design with secure sealing ring for effortless setup and leak-free operation.

This 1/2" Water Flow Sensor features a hall effect switch with a 1-30 L/min flow range, operating at DC 5-24V and up to 1.75MPa pressure. Made from food-grade, ROHS-compliant plastic, it ensures safe, accurate fluid measurement for water heaters, coffee machines, purifiers, and more. The pack includes two easy-to-install sensors with secure G1/4" threading and reliable leak-proof sealing.

Specifications

ASIN	B07RG4KXWJ
Best Sellers Rank	#62,523 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #30 in Flowmeters
Date First Available	May 2, 2019
Item Weight	3.52 ounces
Item model number	GR-201P2
Manufacturer	GREDIA
Package Dimensions	7.13 x 4.61 x 1.38 inches

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$34.54

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1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2）

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