Polysulphone bodied flowmeters. Open collector (NPN) pulse output proportional to flow rate. Non-metallic fittings, PVDF, available for pure water or aggressive chemicals. Robust sapphire bearings. ½ Inch BSP threads on the 30 l\/min model also accepts 15mm Compression fittings (brass only). Traceable calibration certificate. Hall effect detection suitable for used with opaque liquidsMaximum Flow Rate = 2.5 - 30 L\/minElectrical Connection = CableControl Output = NPNSupply Voltage = 4.5 - 24 V dcPipe Diameter Range = 1\/2 inMinimum Operating Temperature = -25°CMaximum Operating Temperature = +125°CCurrent Rating = 10 mA