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

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Description

💡 Flow with the Flow: Your Water Management Game Changer!

EASY INSTALLATION - Connects effortlessly to a 2-inch male thread for quick setup.
FOOD GRADE SAFETY - Constructed from food-grade plastic, ensuring compliance with ROHS standards.
LIGHTWEIGHT DESIGN - Weighing only 209g, it’s easy to handle and install.
VERSATILE APPLICATIONS - Ideal for petrochemical, residential, and agricultural use.
PRECISION FLOW MEASUREMENT - Achieve accurate flow readings with a tolerance of ±2%.

The GREDIA 2" Water Flow Sensor is a high-performance Hall Effect flowmeter designed for precise fluid measurement in various applications, including petrochemical industries and irrigation systems. With a flow range of 10-200L/min and a robust food-grade plastic construction, it ensures safety and reliability while being easy to install and lightweight.

Specifications

Manufacturer	GREDIA
Part number	GR-216
Item Weight	209 g
Package Dimensions	16.79 x 14.81 x 7.19 cm; 209 g
Item model number	GR-216
Size	G2" male thread
Style	G2" male thread
Material	Plastic
Batteries Included?	No
Batteries Required?	No

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