Product Description: 1. The lowest rated working voltage: DC4.5 5V-24V 2. Maximum operating current: 15 mA (DC 5V) 3. Working voltage range: DC 5~18 v 4. Load capacity: ≤ 10 mA (DC 5V) 5. Use temperature: ≤ 80 ℃ 6. Operating humidity range: 35%~90%RH (no frost) 7. Allowing pressure: <=1.75Mpa 8. Temperature: -25~+80 ° c 9. Storage humidity: 25%~95%RH Output waveform: square wave NPN pulse signal Product line: Red +, black -, yellow for the pulse signal output The frequency of YF-S201: F=7.5*Q (L / min) error: + 2% voltage: 3.5-24VDC, current cannot exceed 10mA, flow through a litre of water output 450 pulse Flow range: 1-30L/min Features: Flowmeter with G1/2 Threads - simple output to measure the flow rate of water or other non-flammable liquids Great for use with microcontrollers - may also be used for gases with some adjustment for density 1/2" Pipe Threads, Hall Effect Sensor interface, 1-30L/min 1.2MPa Capacity 1. The lowest rated working voltage: DC4.5 5V-24V 2. Maximum operating current: 15 mA (DC 5V) 3. Working voltage range: DC 5~18 v 4. Load capacity: ≤ 10 mA (DC 5V) 5. Use temperature: ≤ 80 ℃ 6. Operating humidity range: 35%~90%RH (no frost) 7. Allowing pressure: pressure 1.2Mpa 8. Temperature: -25~+80 ° c 9. External threads: 1/2" 10. High amplitude ≥ 4.6V 11. Low amplitude ≤ 0.5V 12. Electric strength 1250V/min 13. Insulation resistance ≥ 100MΩ 14. Hydrostatic pressure testing ≤ 2.0Mpa 15. External Threads: 1/2" Package Included 1PCS X YF-S201 G1/2" Hall Effect Flowmeter Control Water Flow Sensor