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.

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2インチ水流センサー食品グレードのスイッチホール効果流量計流量計カウンター 10-200L/分

Product ID: 724932135

⚡Wide DC 5-24V operating voltage for versatile use

💧Flow range 10-200 L/min with ±2% accuracy

🔧2-inch BSPT male thread for easy integration

¥14468

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Flow with confidence — precision meets durability in every drop!

FOOD GRADE SAFETY - Crafted from ROHS-compliant, food-grade plastic—perfect for safe water and irrigation applications.
ROBUST LEAK PROOF - Sealing ring guarantees a tight connection, eliminating leaks and downtime.
COMPACT LIGHTWEIGHT - At just 209g and 92x55mm, installation is hassle-free even in tight spaces.
PRECISION FLOW CONTROL - Achieve reliable measurements with ±2% accuracy, ensuring your system runs flawlessly.
VERSATILE VOLTAGE RANGE - Operates smoothly between DC 5-24V, fitting diverse industrial and residential setups.

This 2-inch BSPT male thread flow meter delivers precise water flow measurement from 10 to 200 L/min with ±2% accuracy. Made from food-grade, ROHS-compliant plastic, it supports DC 5-24V operation and withstands water pressure up to 1.75MPa. Lightweight and compact, it’s ideal for applications ranging from petrochemical industries to residential irrigation, ensuring leak-proof, reliable performance.

Specifications

ASIN	B07MY6JHNR
Batteries Included	No
Batteries Required?	No
Customer Reviews	4.0 4.0 out of 5 stars (13)
Date First Available	March 5, 2019
Is Discontinued By Manufacturer	No
Item Weight	209 g
Manufacturer	GREDIA
Material	プラスチック
Package Dimensions	16.79 x 14.81 x 7.19 cm; 209 g
Part number	GR-216
Size	G2" male thread

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