These are a great economical paddle wheel flow sensor with a NPN transistor output. Of polypropylene construction they can operate over a temperature range of -10 to 85degC

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Paddle Wheel Flow Sensor
Overview
These are a great economical paddle wheel flow sensor with a NPN transistor output. Of polypropylene construction they can operate over a temperature range of -10 to 85degC
Features
- Accuracy±0.75% of full scale
 - Measuring pipe size range DN 15 to DN 600(0.5 to 24 inch)
 - Measuring flow rate range 0.15 to 8 M/s(0.5 to 26 Ft/s)
 - Field-rangable supply voltage from 5 to 24 VDC
 - Field-rangable operting temperature from -10 to 85°C
 - Protection class NEMA6,6P(IP68)
 - CE EMC certification
 
