Water meter

Hi I saw that a post on this forum partially solved my problem. I have a liter-counter sensor and I would like to use it by connecting it to arduino. I just don't know how

Post: Water meter with 4 pulses pr. litre connect to Arduino - Project Guidance - Arduino Forum
water meter : ARAD SF15

The information is in the sketch. They used pin 6. It might be best to get a book or two such as the Arduino cookbook and go through it, it will give you the fundamentals you need to understand what you read.

you could connect the sensor to the external timer input of an arduino uno and count pulses over a time period
to give you number of litres

What exactly are you after? Do you want the Flow Rate such as liters per min or liters per hour (LPM, LPH) or gallons per min or Gallons per hour (GPM, GPH). Those would be flow rate. You can also have a Flow Totalizer function. The latter totalizer just tells you the quantity which has flowed. I did notice the following for your meter:

Electrical output: 0.1, 1 and 10 liter / pulse

What I have not found is a good decent data sheet? On flow metering devices the number of pulses per unit of measure is often referred to as the "K" Factor.

Ron

Textbook "Exploring Arduino" covers water meters quite well.
A search on your Arad water meter came up with

"SF-Polymeric Fertilizer Meter" SF15 probably means it is the 15-mm or 1/2" nominal pipe size
Here's the brochure https://arad.co.il/app/uploads/SF_Eng.pdf

A bit of an odd choice?
What liquid are you trying to measure?
It might be cheaper to find a bog standard domestic meter or something second-hand