Flow sensors, flow transmitters, measuring range: 1...25 l/min, with non-return valve, process connection: Rp, 3-wire, DC, operating voltage: 18...32 V DC, current consumption: 35 mA, analog, plug connection, M12 plug connection, analog output, housing material: chemically nickel-plated brass PP V4A (1.4404) anodized aluminum PA, sensor material: V4A (1.4401) brass chemically nickel-plated brass PP PPS O-ring: FKM