I have an Arduino UNO and a YF-S201 flow sensor also equipped with a temperature sensor. I just can't figure out how to get signals from the temperature sensor. This is how I have connected it:
I really have no idea what they are trying to say here:
Green R Resistors (50K)
but I would try using a multimeter, set to measure resistance, and see if the resistance changes as the temperature changes. I suspect that the device is meant to be used as part of a voltage divider.
I think it is a resistance of 50k type ntc, measured with the tester.
I did not know this type of sensor, disassemble mine and make some modifications.
In case you are interested leave link. YF-S402 + DS18B20